RU2782865C1 - Acoustic output device and its action methods - Google Patents

Abstract

FIELD: acoustics.

SUBSTANCE: present invention is an acoustic output device. The acoustic output device may contain an acoustic output component and a support structure forming an acoustically opened structure, which allows for the acoustic output component to acoustically communicate with the environment. The acoustic output component may contain a set of acoustic drivers, each of which can be made with the possibility of sound output in some frequency range. At least one of acoustic drivers may contain a magnetic system for formation of the first magnetic field. The magnetic system may contain the first magnetic component for formation of the second magnetic field and at least one second magnetic component. A magnetic gap can be formed between the first magnetic component and at least one second magnetic component. Voltage of the magnetic field for the first magnetic field in the magnetic gap may be greater than of the second magnetic field in the magnetic gap.

EFFECT: reduction in sound leak and improvement of sound.

7 cl, 61 dwg

Description

Cross-reference to related applications

The present application claims priority over Chinese Patent Application No. 201910888067.6 filed September 19, 2019, Chinese Patent Application No. 201910888762.2 filed September 19, 2019, and Chinese Patent Application No. 201910364346.2 filed April 30, 2019, the contents of each of which are included here via link.

The field of technology to which the invention belongs

The present invention generally relates to acoustic devices, and more specifically, relates to an open acoustic exit device and its method of operation.

State of the art

With the development of acoustic technology, acoustic output devices have become widespread. An open binaural acoustic output device is a portable audio device that facilitates sound conduction within a certain range of the user. In this case, the user can hear the sound in the environment when the acoustic output device delivers the sound (eg, piece of music, news release, weather forecast, etc.) to the user. However, the open design of an open binaural acoustic output device may also lead to sound leakage to some extent. Therefore, it is desirable to provide an acoustic output device and/or method to effectively reduce sound leakage and improve sound from certain acoustic sources, thereby improving the user's sound experience.

The essence of the invention

In accordance with the approach of the present invention, an acoustic output device is provided. The acoustic output device may include an acoustic output component and a support structure for supporting the acoustic output component near the user's ear. The support structure may form an acoustically open structure allowing the acoustic output component to acoustically communicate with the environment. The acoustic output component may comprise a plurality of acoustic drivers. Each of the plurality of acoustic drivers may be configured to output sound over a range of frequencies. The frequency ranges of sounds output by different acoustic drivers may vary. At least one of the plurality of acoustic drivers may include a magnetic system for generating a first magnetic field. The magnetic system may include a first magnetic component for generating a second magnetic field and at least one second magnetic component surrounding the first magnetic component. A magnetic gap may be formed between the first magnetic component and the at least one second magnetic component. The magnetic field strength for the first magnetic field in the magnetic gap may be greater than for the second magnetic field in the magnetic gap.

In some embodiments, the support structure may include a behind-the-ear hook to engage the acoustic output component behind the user's ear.

In some embodiments, the support structure may include a headband placed on the user's head when the user is wearing the acoustic output device.

In some embodiments, the support structure may include a fastening component configured to fasten the acoustic output component near the opening of the user's external auditory canal. The fastening component can be placed in the ear canal without blocking the ear canal.

In some embodiments, the plurality of acoustic drivers may comprise a first acoustic driver configured to output a first sound at a first frequency range and a second acoustic driver configured to output a second sound at a second frequency range. The second frequency range may contain frequencies higher than the first frequency range.

In some embodiments, the support structure may include a plurality of first sonic guide holes and a plurality of second sonic guide holes. The first sound may be output from a plurality of first sound guide holes, and the second sound may be output from a plurality of second sound guide holes.

In some embodiments, the acoustic output device may further comprise a first acoustic path between the first acoustic driver and the plurality of first audio guide holes and a second acoustic path between the second acoustic driver and the plurality of second audio guide holes. The first acoustic path and the second acoustic path may have different frequency selectivity characteristics.

In some embodiments, the plurality of first sonic guide holes may comprise a pair of first sonic guide holes that are spaced apart from each other by a first distance. The plurality of second sonic guide holes may comprise a pair of second sonic guide holes that are spaced apart from each other by a second distance. The first distance may be greater than the second distance.

In some embodiments, the first distance may be in the range of 20 mm to 40 mm and the second distance may be in the range of 3 mm to 7 mm.

In some embodiments, at least one of the plurality of second sound guide holes may be closer to the user's external ear canal than at least one of the plurality of first sound guide holes.

In some embodiments, the support structure may include a first housing to accommodate the first acoustic driver. The first housing may include a first chamber and a second chamber located on either side of the first acoustic driver.

In some embodiments, the first chamber may be acoustically coupled to one of a pair of first sound guide holes. The second chamber may be acoustically coupled to another of the pair of first sound guide holes.

In some embodiments, the support structure may include a second housing to accommodate the second acoustic driver. The second body may include a third chamber and a fourth chamber located on either side of the second acoustic driver.

In some embodiments, the third chamber may be acoustically coupled to one of a pair of second sound guide holes. The fourth chamber may be acoustically coupled to another of a pair of second sound guide holes.

In some embodiments, the first sound may comprise a first portion output from one of a pair of first sound guide holes and a second portion output from another of a pair of first sound guide holes. The first part may be in reverse phase with respect to the second part.

In some embodiments, the first frequency range may contain frequencies below 650 Hz and the second frequency range may contain frequencies above 1000 Hz.

In some embodiments, the first frequency band and the second frequency band may overlap with each other.

In some embodiments, the acoustic output device may further comprise a control device configured to control the first acoustic driver and the second acoustic driver. The control device may include a frequency splitter configured to split the source signal into a low frequency signal corresponding to the first frequency band to control the first acoustic driver to output the first sound, and a high frequency signal corresponding to the second frequency band to control the second acoustic driver to output the second sound.

In some embodiments, the frequency separation module may comprise at least one of the following: a passive filter, an active filter, an analog filter, or a digital filter.

In some embodiments, the first acoustic driver may comprise a first electro-acoustic transducer. The second acoustic driver may include a second electro-acoustic transducer. The first acoustic transducer and the second acoustic transducer may have different frequency characteristics.

In some embodiments, the implementation of the magnetic system may further include a first magnetic conductive component mechanically connected to the first surface of the first magnetic component.

In some embodiments, the acoustic output device may further comprise a second magnetic conductive component mechanically coupled to the second surface of the first magnetic component and to at least one third magnetic component. The second surface may be opposite the first surface of the first magnetic component. At least one third magnetic component may be mechanically connected to each of the second magnetic conductive component and at least one second magnetic component.

In some embodiments, the acoustic output device may further comprise at least one fourth magnetic component placed within the magnetic gap and mechanically coupled to each of the first magnetic component and the second magnetic conductive component.

In some embodiments, the acoustic output device may further comprise at least one electrical conductive component mechanically coupled to at least one of the first magnetic component, the first magnetic conductive component, or the second magnetic conductive component.

In some embodiments, the acoustic output device may further comprise at least one fifth magnetic component mechanically coupled to the first magnetic conductive component. At least one fifth magnetic component and the first magnetic component may be located on opposite sides of the first magnetic conductive component.

In some embodiments, the acoustic output device may further comprise a third magnetic conductive component to suppress magnetic field leakage of the first magnetic field. The third magnetic conductive component may be mechanically connected to the fifth magnetic component. The third magnetic conductive component and the first magnetic conductive component may be located on opposite sides of the fifth magnetic component.

In some embodiments, the acoustic output device may further comprise a magnetic connector configured to charge the acoustic output device when the magnetic connector receives a charge from the external power supply interface.

In some embodiments, the magnetic connector may include a magnetic adsorption ring, an insulating base, and a plurality of leads. The insulating base may include a plurality of mounting holes. At least a portion of the insulating base may be inserted into the magnetic adsorption ring. Each of the plurality of leads may be installed in one of the plurality of mounting holes.

In some embodiments, the insulating base may include a support element and an insert element. The cross section of the support element may be larger than that of the insert element. The magnetic adsorption ring can be inserted into the mounting space formed by the support member and the insert member.

In some embodiments, the acoustic output device may further comprise a housing for housing a magnetic adsorption ring and an insulating base.

In some embodiments, the body may include a body and a flange at the end of the body. The main part can be put on the insulating base and the magnetic adsorption ring. The flange may cover the end of the magnetic adsorption ring.

In some embodiments, the outer circumferential wall of the support member and the inner circumferential wall of the body may be mechanically connected with a brace.

In some embodiments, the implementation of the magnetic adsorption ring may be in the form of a circle, and each of the many conclusions may have a contact surface concentric with the magnetic adsorption ring.

In some embodiments, the implementation of the magnetic adsorption ring may have axial symmetry about the center of rotation. The length of the magnetic adsorption ring along the first direction may be different from the length of the magnetic adsorption ring along the second direction. The first direction and the second direction may be perpendicular to each other at the center of rotation.

In some embodiments, the magnetic adsorption ring may comprise a plurality of annular sections. At least one pair of adjacent annular sections of the plurality of annular sections may have different magnetic polarities at their respective end surfaces.

Additional features will be set forth in part in the following description and in part will become apparent to those skilled in the art upon examination of the following accompanying drawings, or may be learned through the manufacture or operation of prototypes. The functions of the present invention can be implemented and achieved in practice or using various approaches of methodologies, means and combinations set forth in the detailed examples discussed below.

Brief description of the drawings

The present invention is further described in terms of exemplary embodiments. These exemplary embodiments are described in detail with reference to the drawings. The drawings are not to scale. These embodiments are not limited to the exemplary embodiments in which like reference numerals represent similar structures in several views of the drawings, and where:

fig. 1 is an exemplary component acoustic output device in accordance with some embodiments of the present invention;

fig. 2A is an exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 2B is an exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 3 is an exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 4 is an exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 5 are exemplary two point sources corresponding to some embodiments of the present invention;

fig. 6 is a change in the sound leakage of two point sources according to some embodiments of the present invention;

fig. 7A-7B are plots of near field loudness and far field and scattered sound loudness as a function of distance between two point sources, in accordance with some embodiments of the present invention;

fig. 8 is an exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 9A-9B are exemplary use cases for an acoustic driver in accordance with some embodiments of the present invention;

fig. 10A-10C are exemplary audio output scenarios in accordance with some embodiments of the present invention;

fig. 11A-11B show acoustic output devices in accordance with some embodiments of the present invention;

fig. 12A-12C are acoustic paths in accordance with some embodiments of the present invention;

fig. 13 is an exemplary plot of sound leakage during operation of two sets of two point sources in accordance with some embodiments of the present invention;

fig. 14 is another exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 15 shows two point sources and listening positions in accordance with some embodiments of the present invention;

fig. 16 is a graph of the loudness of the audio heard by the user for two point sources with different distances between them, as a function of the frequency of the sound, according to some embodiments of the present invention;

fig. 17 is a plot of the normalized far-field parameter of two point sources as a function of sound frequency, in accordance with some embodiments of the present invention;

fig. 18 is a distribution diagram showing an exemplary baffle provided between two point sources, in accordance with some embodiments of the present invention;

fig. 19 is a graph of the volume of the sound heard by the user as a function of the frequency of the sound when the pinna is positioned between two point sources, in accordance with some embodiments of the present invention;

fig. 20 is a plot of leakage sound loudness as a function of frequency when the pinna is positioned between two point sources, in accordance with some embodiments of the present invention;

fig. 21 is a plot of the normalized parameter as a function of frequency when two acoustic output point sources are distributed over two sides of the pinna, in accordance with some embodiments of the present invention;

fig. 22 is a plot of user listening volume and leak volume as a function of frequency with and without a baffle between two point sources, in accordance with some embodiments of the present invention;

fig. 23 is a plot of user hearing loudness and leak loudness as a function of distance between two point sources at 300 Hz with and without a baffle, in accordance with some embodiments of the present invention;

fig. 24 is a plot of user-audible loudness and leak loudness as a function of distance between two point sources at 1000 Hz with or without a baffle, in accordance with some embodiments of the present invention;

fig. 25 is a plot of user-audible loudness and leak loudness as a function of distance at 5000 Hz with or without a baffle between two point sources, in accordance with some embodiments of the present invention;

fig. 26 is a graph of the change in the volume of the sound heard by the user as a function of frequency when the distance d between two point sources is 1 cm, according to some embodiments of the present invention;

fig. 27 is a graph of the change in the loudness of the sound heard by the user as a function of frequency when the distance d between two point sources is 2 cm, according to some embodiments of the present invention;

fig. 28 is a plot of the normalized parameter as a function of frequency when the distance d between two point sources is 4 cm, in accordance with some embodiments of the present invention;

fig. 29 is a plot of the normalized far field parameter as a function of sound frequency when the distance d between two point sources is 1 cm, in accordance with some embodiments of the present invention;

fig. 30 is a plot of the normalized parameter as a function of frequency when the distance d between two point sources is 2 cm, in accordance with some embodiments of the present invention;

fig. 31 is a plot of the normalized parameter as a function of frequency when the distance d between two point sources is 4 cm, in accordance with some embodiments of the present invention;

fig. 32 is a graph of exemplary distributions of various listening positions in accordance with some embodiments of the present invention;

fig. 33 is a graph of loudness of audio heard by a user from two point sources without a baffle at various listening positions in the near field as a function of audio frequency, in accordance with some embodiments of the present invention;

fig. 34 is a plot of the normalized parameter of two non-baffled point sources at various near field listening positions in accordance with some embodiments of the present invention;

fig. 35 is a graph of the loudness of audio heard by a user from two baffled point sources at various near field listening positions as a function of frequency, in accordance with some embodiments of the present invention;

fig. 36 is a plot of the normalized parameter of two baffled point sources at different near field listening positions, in accordance with some embodiments of the present invention;

fig. 37 shows two point sources and a baffle according to some embodiments of the present invention;

fig. 38 is a plot of near field loudness as a function of sound frequency when the baffle is in various positions, in accordance with some embodiments of the present invention;

fig. 39 is a plot of far-field leakage loudness as a function of sound frequency when the baffle is in various positions, in accordance with some embodiments of the present invention;

fig. 40 is a plot of normalization parameter change as a function of sound frequency when the baffle is in various positions, in accordance with some embodiments of the present invention;

fig. 41 is another exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 42 is a longitudinal sectional view of an exemplary acoustic output device in accordance with some embodiments of the present invention;

fig. 43 is a longitudinal sectional view of an exemplary magnetic system in accordance with some embodiments of the present invention;

fig. 44 is a longitudinal sectional view of an exemplary magnetic system in accordance with some embodiments of the present invention;

fig. 45 is a longitudinal sectional view of an exemplary magnetic system in accordance with some embodiments of the present invention;

fig. 46 is a longitudinal sectional view of an exemplary magnet system in accordance with some embodiments of the present invention;

fig. 47 is a longitudinal sectional view of an exemplary magnetic system in accordance with some embodiments of the present invention;

fig. 48 is an exploded perspective view of a portion of an acoustic output device in accordance with some embodiments of the present invention;

fig. 49 is a cross-sectional view of a portion of the acoustic output device shown in FIG. 48 corresponding to some embodiments of the present invention;

fig. 50 is a partially enlarged view of portion A of the magnetic connector shown in FIG. 49 corresponding to some embodiments of the present invention;

fig. 51 is a plan view of an exemplary magnetic connector in accordance with some embodiments of the present invention;

fig. 52 is a plan view of another exemplary magnetic connector in accordance with some embodiments of the present invention; and

fig. 53 is a plan view of another exemplary magnetic connector in accordance with some embodiments of the present invention.

Implementation of the invention

To illustrate the technical solutions associated with the embodiments of the present invention, the following is a brief description of the drawings referred to in the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios corresponding to these drawings without further creative effort. Unless otherwise indicated or clearly follows from the context, the same reference numeral in the drawings refers to the same structure and operation.

As used in the invention and in the appended claims, the singular forms also denote the plural, unless the content clearly dictates otherwise. Additionally, it should be understood that the terms "comprises", "comprising", "comprises" and/or "comprising", when used in the invention, determine the presence of the claimed steps and elements, but do not exclude the presence or addition of one or more other steps and elements. .

Certain modules of the system may be referred to in various ways in accordance with some embodiments of the present invention, however, any number of different modules may be used and operated on a client terminal and/or server. These modules are intended to be illustrative and are not intended to limit the protection scope of the present invention. Various modules may be used in various aspects of the system and method.

In accordance with some embodiments of the present invention, flow charts are used to illustrate the operations performed by the system. It should be obviously clear that the operations that come before or after each other may or may not be implemented in order. On the other hand, the operations may be performed in reverse order or simultaneously. In addition, one or more other steps may be added to the flowcharts, or one or more steps may be omitted from the flowchart.

The technical solutions of the embodiments of the present invention will be described with reference to the drawings as shown below. Obviously, the described embodiments are not exhaustive and do not create restrictions. Other embodiments derived from the embodiments formulated in the present invention by those skilled in the art without any creative effort are within the protection scope of the present invention.

In FIG. 1 shows an exemplary acoustic output device 100 in accordance with some embodiments of the present invention. As used here, the term "acoustic output device 100" refers to a device having a sound output function. In practical applications, the acoustic output device 100 may be implemented by various types of products, such as an earpiece, bracelet, glasses, helmet, watch, clothing or backpack, and the like. or any combination of them. For purposes of illustration, an earphone with an audio output function can be cited as an example of an acoustic output device.

As shown in FIG. 1, an acoustic output device 100 may include a cabinet 101, a power supply 102, an acoustic driver 103, an acoustic path 105, and an audio guide hole 106.

Enclosure 101 may be configured to protect one or more components of acoustic output device 100 (eg, power supply 102, acoustic driver 103, and/or acoustic path 105). For example, the housing 101 may form a housing space, and one or more components of the acoustic output device 100 (eg, power supply 102, acoustic driver 103, acoustic path 105) may be placed in the housing space. In some embodiments, housing 101 may comprise one or more non-magnetic metallic materials (eg, copper, aluminum, and/or aluminum alloy), plastic material, and the like. or any combination of them. The body 101 may comprise one or more hard materials and/or one or more soft materials.

In some embodiments, housing 101 may include one or more components for attaching acoustic output device 100 to, for example, an ear, a head, a shoulder, or the like. by a user who wears the acoustic output device 100. Just by way of example, the housing 101 may include a support structure for holding the acoustic output component of the acoustic output device 100 near the user's ear. The acoustic output component of the acoustic output device 100 may comprise, for example, an acoustic driver 103 (or a portion thereof), an acoustic path 105, an audio guide hole 106, or any other component for generating and/or outputting sounds, and any combination thereof. In some embodiments, the support structure may form an acoustically open structure that allows the acoustic output component to acoustically communicate with the environment. An acoustic output device 100 that includes such a support structure may be referred to as an open acoustic output device. When worn by a user, the open acoustic output device cannot obstruct the user's external ear canal and allows the user to listen to sounds generated by the open acoustic output device as well as environmental sounds.

In some embodiments, the implementation of the support structure may have any suitable form, shape and/or size. Just by way of example, the support structure may include a behind-the-ear holder to hang the acoustic output component(s) on the user's ear. The behind-the-ear holder may be in the form of, for example, a round ring, an oval, a polygon (regular or irregular), a U-shape, a V-shape, a semicircle, and the like. As another example, the support structure may include a headband placed over the wearer's head when the user is wearing the acoustic output device 100. The headband may be completely rigid or completely soft. On the other hand, part of the dressing may be rigid and another part of the dressing may be soft. As yet another example, the support structure may include an attachment component configured to attach an acoustic output component near a user's ear canal opening, where the attachment component can be placed in the external auditory canal without obstructing the external auditory canal. Just by way of example, the attachment component may be in the form of a hollow circular ring corresponding to the external ear canal. When worn by a user, the annular ring can be inserted into the external auditory canal without obstructing the external auditory canal. Additional descriptions regarding the support structure can be found elsewhere in the present invention. See, for example, Fig. 2A-4 and their respective descriptions.

Power supply 102 may be configured to provide power to one or more components of acoustic output device 100 (eg, acoustic driver 103). In some embodiments, power supply 102 may include a circuit component, a battery, a charging interface, and the like. or any combination of them. The circuit element may be configured to connect the battery and one or more other components of the acoustic output device 100 (eg, acoustic driver 103) and provide power to operate the other components. Exemplary batteries may include, but are not limited to, a rechargeable battery, a dry battery, a lithium battery, and the like. or any combination of them. The charging interface from the power supply 102 may be used to charge the acoustic output device 100 (eg, a battery). In some embodiments, the charging interface from the power source 102 may include a magnetic connector configured to charge the acoustic output device 100 when the magnetic connector receives the charging interface from an external power source. Additional description of the magnetic connector can be found elsewhere in the present invention. See, for example, Fig. 48-53 and their respective descriptions.

Acoustic driver 103 may be configured to convert an electrical signal into sound. The acoustic driver 103 may be acoustically coupled to the acoustic path 105 and the sound guide hole 106. The sound generated by the acoustic driver 103 may be transmitted to the sound guide hole 106 through the acoustic path 105, and the sound guide hole 106 may output sound. In some embodiments, the acoustic driver 103 may comprise a transducer (referred to as an electroacoustic transducer), such as an air conduction speaker, a bone conduction speaker, a hydroacoustic transducer, an ultrasonic transducer, or the like, or any combination thereof. The transducer may be a moving coil type, an electromagnetic type, a piezoelectric type, an electrostatic type, a magnetostrictive type, and the like, or any combination thereof.

In some embodiments, the acoustic driver 103 may include a voice coil, a vibrating plate (eg, a vibrating diaphragm), and a magnetic system 104. The magnetic system 104 may be configured to generate a magnetic field. When current is applied to the voice coil, the strength of the current generated by the magnetic field can control the vibration of the voice coil. Voice coil vibration may drive the vibration plate to vibrate to form sound waves that may be transmitted to sound guide hole 106 via acoustic path 105. In some embodiments, magnet system 104 may include a magnetic component for generating a magnetic field and/or a magnetic conductive component for correction of the magnetic field generated by the magnetic component. In some embodiments, the implementation of the magnetic system 104 may contain multiple magnetic components, which in combination can form a common magnetic field. A magnetic gap may be formed between the magnetic components (or part thereof) of the magnet system 104, and the voice coil may be placed in the magnetic gap. In the magnetic gap, the magnetic field strength of the overall magnetic field may be greater than that of the magnetic field generated by any individual magnetic component of the magnet system 104. Additional description of the acoustic driver can be found elsewhere in the present invention. See, for example, Fig. 8 and its corresponding description. Additional description of the magnetic system can be found elsewhere in the present invention. See, for example, Fig. 42-47 and their respective descriptions.

Acoustic path 105 may be configured to transmit sound. For example, acoustic path 105 may be acoustically coupled to acoustic driver 103 and transmit sound generated by acoustic driver 103 to sound guide hole 106. In some embodiments, acoustic path 105 may include a sound tube, sound cavity, resonant cavity, sound hole, sound slot or tuning net, etc. or any combination of them. In some embodiments, the implementation of the acoustic path 105 may also contain an acoustic resistive material, which may have a certain acoustic impedance. Exemplary acoustic resistive materials may include, but are not limited to, plastic, fabric, metal, permeable material, woven material, shielding material or mesh material, porous material, particulate material, polymeric material, and the like. or any combination of them. Additional descriptions regarding the acoustic path can be found elsewhere in the present invention. See, for example, Fig. 8 and its corresponding description.

The sound guide hole 106 must be configured to propagate sound, such as the sound generated by the acoustic driver 103. In some embodiments, the sound guide hole 106 may be formed on the body 101 of the acoustic output device 100 with a certain output and sound passage. Exemplary shapes of the sound guide hole 106 may include a circular shape, an oval shape, a square shape, a trapezoid shape, a rounded quadrilateral shape, a triangular shape, an irregular shape, and the like. or any combination of them.

In some embodiments, acoustic output device 100 may comprise any number of acoustic drivers 103, acoustic paths 105, and/or sound guide holes 106. In some embodiments, acoustic output device 100 may comprise a plurality of acoustic drivers 103, each of which is configured to produce sound. in a certain frequency range. Sounds produced by different acoustic drivers 103 may have different frequency ranges. Alternatively, the acoustic output device 100 may further comprise a plurality of acoustic paths 105 and a plurality of pairs of sound guide holes 106. The sound produced by each of the acoustic drivers 103 may be transmitted to one pair of sound guide holes 106 via one of the acoustic paths 105. In some embodiments, parameter(s) of acoustic drivers 103, acoustic paths 105, and/or pairs of sound guide holes 106 can be adjusted to improve the performance of acoustic output device 100, for example, reduce or eliminate acoustic output device sound leakage to the environment and/or increase for user output result of the acoustic output device.

The description of acoustic output device 100 is for illustrative purposes only and is not intended to limit the protection scope of the present invention. Various changes and modifications can be made by those skilled in the art in accordance with the description of the present invention. In some embodiments, acoustic output device 100 may include one or more additional components and/or one or more components of acoustic output device 100 described above may be omitted. For example, acoustic output device 100 may include a memory component for storing signals containing audio information. As another example, acoustic output device 100 may comprise one or more processors that may execute one or more audio signal processing algorithms to process audio signals. Additionally or alternatively, two or more components of the acoustic output device 100 may be integrated into a single component. The acoustic output device component 100 may be implemented in two or more sub-components.

In FIG. 2A shows an exemplary acoustic output device 200A in accordance with some embodiments of the present invention. As shown in FIG. 2A, the acoustic output device 200A may include at least one circuit housing 210, two earhooks 220, a backhook 230, a first speaker subassembly 240a, and a second loudspeaker subassembly 240b. The circuit housing 210 may be used to house one or more components of the acoustic output device 200A, such as a driving circuit, a battery, and the like. or any combination of them.

In some embodiments, acoustic output device 200A may include a first circuit package 210a and a second circuit package 210b, as shown in FIG. 2A. One of the two BTEs 220 may be mechanically connected to the first speaker assembly 240a and the first circuit housing 210a. Another behind-the-ear holder 220 may be mechanically connected to the second speaker assembly 240b and the second circuit housing 210b. The behind-the-ear holders 220 may be used as a support structure for the acoustic output device 200A. For example, the shape of each BTE 220 may conform to the shape of the user's ear. When the user wears the acoustic output device 200A, the behind-the-ear holder 220 can be hooked onto the user's ear and the back holder 230 can wrap around the back of the user's head. For example, behind-the-ear holder 220a may be used to press first speaker assembly 240a near the user's left ear, and behind-ear holder 220b may be used to press second speaker assembly 240b near the user's right ear. In some embodiments, the first and second speaker assemblies may not overlap the user's ear canals.

The speaker subassemblies 240a and 240b may include one or more acoustic output components for generating and/or outputting sound, such as an acoustic driver. In some embodiments, a plurality of components of the acoustic output device 200A may form an integral subassembly. In some embodiments, acoustic output device 200A may include one or more additional components and/or one or more components of acoustic output device 200A may be omitted. For example, the acoustic output device 200A may include one or more user interaction elements, such as one or more buttons, a microphone, a touch screen, and the like, to enable the user to interact with the acoustic output device 200A. As another example, the back holder 230 may be omitted and the two ear holders may be used independently.

In some embodiments, acoustic output device 200A may include one or more audio guide holes for outputting sounds. The number of sound guide holes can be any positive integer such as 1, 2, 4, 5, 10, and so on. The sound guide hole may be located anywhere on the acoustic output device 200A. Just by way of example, a plurality of sound guide holes may be mounted on the body of the speaker assembly 240a, and the sound guide holes may be located on the same surface or on different surfaces of the speaker assembly 240a. As another example, a sound guide hole may be located on the speaker assembly 240a (e.g., on the surface of the speaker assembly 240a opposite the first circuit body 210a), and another sound guide hole may be located on the first circuit body 210a (e.g., on surface of the first circuit body 210a opposite the speaker subassembly 240a). When the user wears the acoustic output device 200A, the sound guide hole on the speaker assembly 240a and the sound guide hole on the first circuit body 210a can be located on both sides of the user's ear.

In FIG. 2B shows an exemplary acoustic output device 200B in accordance with some embodiments of the present invention. As shown in FIG. 2B, acoustic output device 200B may include a behind-the-ear holder 250, at least one audio guide hole 260, and a speaker assembly (not shown in FIG. 2B). The behind-the-ear holder 250 may be in the form of a circular ring that can be hung over the ear of the user of the acoustic output device 200B. In some embodiments, a stowage space may be formed within the behind-the-ear holder 250 to accommodate a speaker assembly (eg, acoustic driver).

The sound guide hole(s) 260 may be provided on the body of the earhook 250. The number of sound guide holes 260 may be any positive integer. Just for example, as shown in FIG. 2B, two sound guide holes 260 may be provided on the side of the BTE 250 adjacent to the user's external ear canal, and one sound guide hole 260 may be provided on the side of the BTE 250 adjacent to the back of the ear. It should be understood that the acoustic output device 200B in FIG. 2B is presented for illustration purposes and may be modified according to actual needs. For example, the behind-the-ear holder 250 may have any other shape suitable for human ears, such as oval, polygonal (regular or irregular), U-shaped, V-shaped, half circle, and the like. The at least one sound guide hole 260 may be located anywhere on the acoustic output device 200B.

In FIG. 3 depicts an exemplary acoustic output device 300 in accordance with some embodiments of the present invention. As shown in FIG. 3, the acoustic output device 300 may have a headband-like structure and include a housing 310, at least one sound guide hole 320 (for example, the first sound guide hole 320-1, the second sound guide hole 320-2, the third sound guide hole 320 -3 and fourth sound guide hole 320-4) and a speaker assembly (not shown in FIG. 3). The housing 310 may be in the form of a headband and include at least a side surface 312 and at least an end surface 314. The acoustic output device 300 may be placed on the head or neck of the wearer while the user is wearing the acoustic output device 300.

At least one sonic guide hole 320 may be located in the housing 310. Just for example, the first sonic guide hole 320-1 may be located on the end surface 314. The second sonic guide hole 320-2, the third sonic guide hole 320-3 and the fourth sound guide hole 320-4 may be located on the side surface 312. The different sound guide holes 320 may have the same shape or different shapes. In some embodiments, different sound guide holes may be used to output sounds with different frequency ranges. Just as an example, sound guide holes 320-1 and 320-2 can be used to output low frequency sounds (for example, sound below the threshold frequency), and sound guide holes 320-3 and 320-4 can be used to output high frequency sounds. (for example, sound with a frequency above the threshold frequency). The distance between the sound guide holes 320-1 and 320-2 and/or the distance between the sound guide holes 320-3 and 320-4 may be adjusted to achieve improved acoustic output device 300 performance such as reduced sound leakage to the environment and/or improved the result of outputting sound to the user's ears.

In FIG. 4 shows an exemplary acoustic output device 400 in accordance with some embodiments of the present invention. The acoustic output device 400 may include a housing 410, a mounting component 420, and a speaker assembly (not shown in FIG. 4) housed within the housing 410. In some embodiments, the speaker assembly of the acoustic output device 400 may be mechanically connected to the mounting component 240 and placed near the opening of the external auditory meatus through the attachment component 240. The attachment component 240 may be shaped to match the external auditory meatus of the user and can be fixed in the external auditory meatus. The fastening component 240 may have a through hole through which air can pass when it is fixed in the external auditory meatus. In some embodiments, the attachment component 240 may comprise one or more soft materials (eg, soft silicone, rubber, etc.) so that it can be comfortable to wear. In some embodiments, one or more sound guide holes may be located on the body 410. For example, the sound guide hole may be located on a portion of the body 410 adjacent to the user's external ear canal, and another sound guide hole may be provided on a portion of the body 410 adjacent with the back of the user's ear.

It should be noted that the examples shown in FIG. 2A-4 are merely illustrative and are not intended to limit the protection scope of the present invention. Numerous changes and modifications can be made by those skilled in the art in studying the present invention in accordance with the principles of the present invention. However, these changes and modifications should not depart from the protection scope of the present invention. For example, the shape, size and/or position of the acoustic output device component can be adjusted according to actual needs.

In FIG. 5 shows two exemplary point sources according to some embodiments of the present invention. To further explain the effect of providing sound guide holes on an acoustic output device, and assuming that sound can be considered as propagating outside the sound guide holes, the present invention may describe sound guide holes on an acoustic output device as sources of sound output.

For convenience of description and illustration purposes only, when the sizes of sound guide holes on an acoustic output device are small, each sound guide hole may be roughly considered as a point source (or referred to as a point sound source or sound source). In some embodiments, any sound guide hole provided on an acoustic output device for sound output can be roughly considered as a single point source (sound) on the acoustic output device. The sound field pressure p formed by a single point source can satisfy equation (1):

… (1)

… (one)

where ω denotes the angular frequency, ρ ₀ denotes the air density, r denotes the distance between the target point and the point source, Q ₀ denotes the volumetric velocity of the point source, and k denotes the wavenumber. It can be concluded that the magnitude of the sound field pressure of a point source at the target point is inversely proportional to the distance from the target point to the point source.

It should be noted that sound guide holes for outputting sound as point sources can only serve as an explanation of the principle and result of the present invention, and cannot limit the shapes and sizes of sound guide holes in practical use. In some embodiments, if the area of the sonic guide hole is large enough, the sonic guide hole may also be equivalent to a flat acoustic source. In some embodiments, the point source may also be implemented by other structures such as a vibrating surface and a sound emission surface. It will be understood by those skilled in the art, without undue creative effort, that the sounds produced by structures such as a sonic guide hole, a vibrating surface, and an acoustic emission surface can be similar to the spatial scale point source discussed in the present invention, and may have similar sound propagation characteristics and a similar way of mathematical description. Additionally, it may be known to those skilled in the art without much creative effort that the acoustic effect achieved by "the acoustic driver can output sound from at least two first sound guide holes" as described in the present invention can also achieve the same result with other acoustic structures, for example, "at least two acoustic drivers, each of which can output sound from at least one acoustic emitting surface." According to actual situations, other acoustic structures can be chosen to regulate and combine, and the same acoustic effect can also be achieved. The principle of sound emission from structures such as surface sound sources may be similar to that of point sources and may not be repeated here.

As mentioned above, at least two sound guide holes corresponding to the same acoustic driver can be provided on the acoustic output device presented in the description. In this case, two point sources can be formed, which can reduce the sound transmitted to the environment. For convenience, the sound output from the acoustic output device to the environment may be referred to as far-field leakage since it can be heard by others in the environment. The sound output from the acoustic output device to the ears of the user who wears the acoustic output device may be referred to as near-field sound because the distance between the acoustic output device and the user is relatively small. In some embodiments, sound output from two sound guide holes (ie, two point sources) may have a certain phase difference. When the distance between the two point sources and the phase difference of the two point sources satisfy a certain condition, the acoustic output device can produce different sound effects in the near field (eg, at the position of the user's ear) and far field. For example, if the phases of the point sources corresponding to the two sound guide holes are opposite, that is, the absolute value of the phase difference of the two point sources is 180 degrees, the far-field leakage can be reduced according to the anti-phase signal suppression principle. Further details on improving the acoustic output by adjusting the amplitude and/or phase of each point source can be found in International Application No. PCT/CN2019/130884, filed December 31, 2019, the entire contents of which are hereby incorporated by reference.

As shown in FIG. 5, the pressure of the sound field p formed by two point sources can satisfy equation (2):

where A1 and A2 denote the intensities of the two point sources and ϕ1 and ϕ2 denote the phases of the two point sources, respectively, d denotes the distance between the two point sources, and r ₁ and r ₂ can satisfy equation (3):

where r is the distance between the target point and the center of the two point sources in space, and θ is the angle between the line connecting the target point to the center of the two point sources and the line on which the two point sources are located.

From equation (3) it can be deduced that the magnitude of the sound pressure p at a target point in the sound field can be related to the intensity of each point source, the distance d, the phase of each point source and the distance r.

Two point sources with different output effects can be obtained with different sound guide hole settings, so that near-field sound volume can be improved and far-field leakage can be reduced. For example, an acoustic driver may include a vibration diaphragm. When the vibrating diaphragm vibrates, sounds can be transmitted from the front and back sides of the vibrating diaphragm, respectively. The front side of the vibrating diaphragm in the acoustic output device may be provided with a front chamber for sound transmission. The anterior chamber can be acoustically coupled to the sound guide hole. The sound on the front side of the vibrating diaphragm can be transmitted to the sound guide hole through the front chamber and further output to the outside. The reverse side of the vibrating diaphragm in the acoustic output device may be provided with a rear chamber for sound transmission. The rear chamber can be acoustically coupled to another sound guide hole. Sound from the back of the vibrating diaphragm can be transmitted to the sound guide hole through the rear chamber and further propagated outward. It should be noted that when the vibrating diaphragm vibrates, the front side and the back side of the vibrating diaphragm may produce sounds with opposite phases. In some embodiments, the structures of the anterior chamber and the rear chamber may be specifically set so that the sound output from the acoustic driver to the various sound guide holes can satisfy a certain condition. For example, the lengths of the anterior chamber and the posterior chamber may be specially designed such that sounds with a certain phase relationship (eg, opposite phases) can be output through the two sound guide holes. As a result, the problem that the acoustic output device has low volume in the near field and sound leakage in the far field can be effectively solved.

Under certain conditions, compared to the far-field leakage rate for a single point source, the far-field leakage rate of two point sources may increase with frequency. In other words, the ability to reduce the leakage of two point sources in the far field may decrease with increasing frequency. For further description in FIG. 6, a curve can be presented showing the relationship between far field leakage and frequency.

In FIG. 6 shows the change in sound leakage of two point sources and one point source as a function of frequency in accordance with some embodiments of the present invention. The distance between the two point sources in Fig. 6 may be fixed and the two point sources may have essentially the same amplitude and opposite phases. The dotted line may indicate the loudness curve of the leakage sound of a single point source at different frequencies. The solid line may indicate the loudness curve of the leakage sound of two point sources at different frequencies. The abscissa on the graph may represent the audio frequency (f) and the unit may be Hertz (Hz). The ordinate on the graph can use the normalization parameter α to estimate the loudness of the leak sound. Parameter α can be determined by equation (4):

where P _far represents the far-field sound pressure of the acoustic output device (ie, the far-field sound leakage sound pressure). P _ear represents the sound pressure at the user's ears (i.e., near field sound pressure). The larger the value of α, the greater the far-field sound leakage relative to the near-field sound heard, indicating poor ability of the acoustic output device to reduce far-field sound leakage.

As shown in FIG. 6, when the frequency is below 6000 Hz, the far-field leakage generated by two point sources may be smaller than the far-field leakage generated by a single point source, and may increase with increasing frequency. When the frequency is close to 10,000 Hz (eg, approximately 8,000 Hz or higher), the far-field leakage generated by two point sources may be larger than the far-field leakage generated by a single point source. In some embodiments, the frequency corresponding to the intersection of the change curves of two point sources and one point source may be defined as the upper limit frequency up to which two point sources are still able to reduce sound leakage.

For purposes of illustration, when the frequency is relatively small (for example, in the range of 100Hz~1000Hz), the sound leakage reduction ability of two point sources can be strong (for example, the value of α is small, such as below -80dB). In this frequency band, increasing the volume of the audio heard by the user can be defined as an optimization goal. When the frequency is increased (for example, in the range of 1000Hz ~ 8000Hz), the ability to reduce sound leakage of two point sources may be weak (for example, above -80dB). In such a frequency band, the reduction of sound leakage can be defined as an optimization goal.

In accordance with FIG. 6, it is possible to determine the crossover point based on the trend of the ability of two point sources to reduce sound leakage. The parameters of the two point sources can be adjusted according to the crossover point to reduce the sound leakage of the acoustic output device. For example, a frequency corresponding to a certain value of α (eg, -60dB, -70dB, -80dB, -90dB, etc.) can be used as a crossover point. The parameters of the two point sources can be determined to improve the near field audio in the frequency band below the crossover point and/or to reduce the far field audio leakage in the frequency band above the crossover point. In some embodiments, a high frequency high frequency band (eg, when sound is output from a high frequency acoustic driver) and a low frequency low frequency band (eg, when sound is output from a low frequency acoustic driver) may be determined based on the crossover point. Additional details about the crossover point may be disclosed elsewhere in the present invention, such as in FIG. 8 and in its description.

In some embodiments, the method for measuring and determining sound leakage may be adjusted according to actual conditions. For example, a plurality of points on a spherical surface centered by the center point s of two point sources with a radius r (eg 40 centimeters) can be identified and the mean value of the sound pressure amplitudes at the plurality of points can be determined as the sound leakage value. The distance between the near field listening position and the point sources can be much smaller than the distance between the point sources and the spherical far field leakage measurement surface. Alternatively, the ratio of the distance from the near field listening position to the center of the two point sources to the radius r may be less than 0.3, 0.2, 0.15, or 0.1. As another example, one or more points in the far field may be taken as a position for measuring sound leakage, and the loudness of sound at that position may be taken as a sound leakage value. As another example, the center of two point sources can be used as the center of a far-field circle, and the sound pressure amplitudes at two or more points evenly distributed around the circle according to a certain solid angle can be averaged as the sound leakage value. These methods may be adjusted by those skilled in the art according to actual conditions and are not intended to be limiting.

In accordance with FIG. 6, it can be concluded that in the high frequency band (the high frequency band defined according to the crossover point), two point sources may have a weak sound leakage reduction capability. In the low frequency band (low frequency band defined according to the crossover point), two point sources can have a strong sound leakage reduction capability. At a certain audio frequency, if the distance between two point sources changes, their ability to reduce sound leakage may change, and the difference between the loudness of the sound heard by the user (also called “listening sound”) and the loudness of the sound of the leak may also change. For a better description, the far field leakage curve as a function of the distance between two point sources can be described with reference to FIG. 7A and 7B.

In FIG. 7A and 7B are exemplary graphs showing near-field sound volume and far-field leakage sound loudness versus distance between two point sources, in accordance with some embodiments of the present invention. Fig. 7B can be obtained by performing normalization on the graph of FIG. 7A.

In FIG. 7A, the solid line may represent the loudness curve of two point sources as a function of the distance between the two point sources, and the dotted line may represent the loudness curve of the leakage sound of two point sources as a function of the distance between the two point sources. The abscissa may represent the ratio of the distances d/d ₀ for the distance d of these two point sources to the reference distance d ₀ . The ordinate can represent the loudness of a sound (the unit is decibel, dB). The distance ratio d/d ₀ may reflect the change in distance between these two point sources. In some embodiments, the implementation of the reference distance d ₀ may be selected in a certain range. For example, d ₀ may be a specific value within 2.5 mm ~ 10 mm, for example, d ₀ may be 5 mm. In some embodiments, the reference distance d ₀ may be determined based on the listening position. For example, the distance between the listening position and the nearest point source can be taken as a reference distance d ₀ . It is known that the reference distance d ₀ can be flexibly selected from any other suitable values according to actual conditions, which is not limited here. Just for example, in Fig. 7A d ₀ may be equal to 5 mm.

When the audio frequency is constant, the volume of the sound heard by the user and the volume of the leakage sound of the two point sources may increase as the distance between the two point sources increases. When the distance ratio d/d ₀ is less than the threshold ratio, as the distance between two point sources increases, the increase (or increment) in the volume of the sound heard by the user may be greater than the increase (or increment) in the volume of the leak sound. In other words, the increase in the volume of the sound heard by the user may be more significant than the increase in the volume of the leak sound. For example, as shown in FIG. 7A, when the distance ratio d/d ₀ is 2, the difference between the loudness of the sound heard by the user and the loudness of the sound of the leak may be about 20 dB. When the distance ratio d/d ₀ is 4, the difference between the loudness of the sound heard by the user and the loudness of the sound of the leak may be about 25 dB. In some embodiments, when the distance ratio d/d ₀ reaches a threshold ratio, the ratio of the loudness of the sound heard by the user to the loudness of the leakage sound of the two point sources may reach a maximum value. In this case, as the distance further increases for these two point sources, the loudness curve of the sound heard by the user and the loudness curve of the leak sound may run roughly parallel, that is, the increase in the volume of the sound heard by the user and the increase in the volume of the leak sound may remain, essentially the same. For example, as shown in FIG. 7B, when the distance ratio d/d ₀ is 5, 6, or 7, the difference between the loudness of the sound heard by the user and the loudness of the leak sound may remain essentially the same, and in both cases may be approximately 25 dB. That is, an increase in the volume of the sound heard by the user may coincide with an increase in the volume of the leak sound. In some embodiments, the threshold ratio for the distance ratio d/d ₀ of the two point sources may be in the range 0~7. For example, the threshold ratio d/d ₀ can be set to 0.5~4.5. As another example, the threshold ratio d/d ₀ can be set within 1~4.

In some embodiments, the threshold ratio value may be determined based on the change in the difference between the volume of the audio heard by the user and the volume of the audio leakage of the two point sources shown in FIG. 7A. For example, as a threshold ratio, the ratio corresponding to the maximum difference between the loudness of the sound heard by the user and the loudness of the sound of the leak can be determined. As shown in FIG. 7B, when the distance ratio d/d ₀ is less than a threshold ratio (for example, 4), the curve of the normalized audio heard by the user (also referred to as "normalized audio heard") may show an upward trend (the slope of the curve is greater than 0) as the distance between these two point sources. That is, the increase in the volume of the sound heard by the user may be greater than the increase in the volume of the leak sound. When the distance ratio d/d ₀ is larger than the threshold ratio, the slope of the normalized sound heard by the user may gradually approach 0 as the distance between the two point sources increases. That is, the volume of the sound heard by the user increases as the distance increases. between two point sources there can no longer be more than an increase in the volume of the leak sound.

As described above, if the listening position is fixed, the parameters of the two point sources can be adjusted by certain means. It may be possible to achieve such an effect that the loudness of the sound in the near field of the sound has a significant increase, while the loudness of the sound of the leakage sound in the far field increases only slightly (i.e., the increase in the volume of the sound in the near field is greater than the increase in the volume of the sound of the leakage in the far field ). For example, two or more sets of two point sources (such as a set of two high frequency point sources and a set of two low frequency point sources) may be used. For each set, the distance between the point sources in the set is controlled by certain means so that the distance between two high frequency point sources can be less than the distance between two low frequency point sources. Two low-frequency point sources may have little sound leakage (strong ability to reduce sound leakage), and two high-frequency point sources have large sound leakage (weak ability to reduce sound leakage). The volume of the sound heard by the user can be significantly greater than the volume of the leak sound if the high frequency band is set to a smaller distance between the two point sources, thus reducing sound leakage.

In some embodiments, each acoustic driver may have a corresponding pair of audio guide holes. The distance between sound guide holes corresponding to each acoustic driver can affect the volume of near field sound transmitted to the user's ears and the volume of far field sound leakage transmitted to the environment. In some embodiments, if the distance between the sound guide holes corresponding to the high frequency acoustic driver is less than the distance between the sound guide holes corresponding to the low frequency acoustic driver, the volume of the sound heard by the user can be increased and the sound leakage can be reduced, thus, preventing the sound from being heard by others in the vicinity of the user of the acoustic output device. As described above, the acoustic output device can be effectively used as open headphones even in a relatively quiet environment.

In FIG. 8 shows an exemplary acoustic output device in accordance with some embodiments of the present invention. As shown in FIG. 8, the acoustic output device 800 may include a frequency splitter 810, an acoustic driver 840, an acoustic driver 850, an acoustic path 845, an acoustic path 855, at least two first audio guide holes 847, and at least two second audio guide holes 857. In some embodiments, acoustic output device 800 may further comprise a controller (not shown). The electronic frequency separation module 810 may be part of the controller and is configured to generate electrical signals to the various acoustic drivers. The connection between the various components in the acoustic output device 800 may be wired and/or wireless. For example, the frequency division electronics 810 may send signals to the acoustic driver 840 and/or acoustic driver 850 via wired transmission or wireless transmission.

The electronic frequency division module 810 may divide the frequency of the source signal. The source signal may come from one or more audio source devices (eg, from memory storing audio data). The sound source device may be part of the acoustic output device 800 or an independent device. The source signal may be an audio signal received by acoustic output device 800 via wired or wireless means. In some embodiments, frequency separation electronics 810 may decompose the source signal into two or more frequency separated signals having different frequencies. For example, the frequency division electronics 110 may decompose the source signal into a first frequency division signal (or frequency division signal 1) containing high frequency sound and a second frequency division signal (or frequency division signal 2) containing low frequency sound. For convenience, a frequency separated signal having a high frequency sound may be referred to as a high frequency signal, and a frequency separated signal having a low frequency sound may be referred to as a low frequency signal.

For purposes of description, the low frequency signal described in the present invention may refer to an audio signal with a frequency in the first frequency range (or referred to as the low frequency range). A high frequency signal may refer to an audio signal with a frequency in the second frequency range (or referred to as the high frequency range). The first frequency band and the second frequency band may or may not contain overlapping frequency bands. The second frequency range may contain frequencies higher than the first frequency range. Just as an example, the first frequency range may contain frequencies below the first threshold frequency. The second frequency band may contain frequencies above the second threshold frequency. The first threshold frequency may be lower than the second threshold frequency, or equal to the second threshold frequency, or higher than the second threshold frequency. For example, the first threshold frequency may be lower than the second threshold frequency (eg, the first threshold frequency may be 600 Hz and the second threshold frequency may be 700 Hz), meaning that there is no overlap between the first frequency band and the second frequency band. As another example, the first threshold frequency may be equal to the second frequency (eg, the first threshold frequency and the second threshold frequency may be 650 Hz or any other frequency value). As another example, the first threshold frequency may be higher than the second threshold frequency, indicating that there is overlap between the first frequency band and the second frequency band. In such cases, in some embodiments, the difference between the first threshold frequency and the second threshold frequency cannot exceed the third threshold frequency. The third threshold frequency may be a fixed value, such as 20 Hz, 50 Hz, 100 Hz, 150 Hz, or 200 Hz. Additionally, the third threshold frequency may be a value associated with the first threshold frequency and/or the second threshold frequency (eg, 5%, 10%, 15%, etc. of the first threshold frequency). On the other hand, the third threshold frequency may be a value flexibly set by the user according to actual needs, which cannot be limited here. It should be noted that the first threshold frequency and the second threshold frequency can be set flexibly according to different situations, and this is not limited here.

In some embodiments, frequency splitter electronics 810 may include a frequency divider 815, a signal processor 820, and a signal processor 830. The frequency divider 815 may be used to decompose a source signal into two or more frequency divided signals containing different frequency components, such as divided by frequency. frequency signal 1 having a high frequency audio component and a frequency separated signal 2 having a low frequency audio component. In some embodiments, frequency divider 815 can be any electronic device that can implement a signal splitting function, including, but not limited to, one of the following: a passive filter, an active filter, an analog filter, a digital filter, or any combination thereof. In some embodiments, frequency divider 815 may split the source signal based on one or more split points. The frequency split point may refer to a specific frequency separating the first frequency band and the second frequency band. For example, when there is an overlap frequency range between the first frequency range and the second frequency range, the frequency split point may be a characteristic point in the overlapping frequency range (eg, low frequency edge point, high frequency border point, center frequency point, etc. of the overlapping frequency range). In some embodiments, the frequency division point may be determined according to the relationship between frequency and acoustic output device sound leakage (eg, the curves shown in FIGS. 6, 7A and 7B). For example, assuming that the sound leakage of acoustic output devices varies with frequency, a frequency point corresponding to the sound volume of the leakage satisfying a certain condition may be chosen as the crossover point, such as 1000 Hz, shown in FIG. 6. In some alternative embodiments, the user may directly specify a particular frequency as the crossover point. For example, assuming that the frequency range of sounds that can be heard by the human ear is 20 Hz - 20 kHz, the user can select the division point of the frequency range in this range as the frequency split point. For example, the crossover point may be 600 Hz, 800 Hz, 1000 Hz, 1200 Hz, and the like. In some embodiments, the crossover point may be determined based on the characteristics of the acoustic drivers 840 and 850. For example, assuming that the low frequency acoustic driver and the high frequency acoustic driver have different frequency response curves, the crossover point may be selected within the frequency range. The frequency range can be higher than 1/2 of the upper frequency limit of the low frequency acoustic driver and 2 times lower than the lower frequency limit of the high frequency acoustic driver. In some embodiments, the crossover point may be selected in the frequency range above 1/3 of the upper cutoff frequency of the low frequency acoustic driver and below 1.5 times the lower cutoff frequency of the high frequency acoustic driver. In some embodiments, in the overlapping frequency range, positional relationships between point sources can also affect the loudness of the sound produced by the acoustic output device in the near field and in the far field. Further details can be found in International Application No. PCT/CN2019/130886, filed December 31, 2019, the entire contents of which are hereby incorporated by reference.

The signal processor 820 and the signal processor 830 may further process the frequency separated signal to meet audio output requirements. In some embodiments, signal processor 820 and/or signal processor 830 may comprise one or more signal processing components. For example, the signal processing component(s) may include, but are not limited to, an amplifier, an amplitude modulator, a phase modulator, a delay device, a dynamic gain control, and the like. or any combination of them. Just by way of example, the processing of an audio signal by signal processor 820 and/or signal processor 830 may comprise adjusting the amplitude of a portion of the components of the audio signal having certain frequencies. In some embodiments, if the first frequency band and the second frequency band overlap, signal processors 820 and 830 may adjust the intensity of the portion of the audio signal components that have a frequency in the overlapping frequency range (e.g., reduce the amplitude of the portion of the components that have a frequency in the overlapping frequency range). ). This avoids a situation where, in the final sound output from the acoustic output device, a portion of the components that correspond to the overlapping frequency range may be excessively loud due to the multiple audio signals.

After processing by signal processors 820 or 830, frequency separated signals 1 and 2 can be transmitted to acoustic drivers 840 and 850, respectively. In some embodiments, the processed frequency-divided signal provided to acoustic driver 840 may be an audio signal having a lower frequency band (eg, a first frequency band). Therefore, acoustic driver 840 may also be referred to as a low frequency acoustic driver. The processed, frequency separated signal provided to acoustic driver 850 may be an audio signal having a high frequency range (eg, a second frequency range). Therefore, the acoustic driver 850 may also be referred to as a high frequency acoustic driver. The acoustic driver 840 and the acoustic driver 850 can convert audio signals into low frequency audio and high frequency audio, respectively, and then output the converted signals to the outside.

In some embodiments, acoustic driver 840 may be acoustically coupled to at least two first sound guide holes. For example, acoustic driver 840 may be acoustically coupled to the first two sound guide holes 847 via two acoustic paths 845. Acoustic driver 840 may output sound through at least two first sound guide holes 847. Acoustic driver 850 may be acoustically coupled to at least two second sound guide holes. For example, acoustic driver 850 may be acoustically coupled to two second sound guide holes 857 via two acoustic paths 855. Acoustic driver 850 may output sound through at least two second sound guide holes 857. The sound guide hole may be a small hole provided on the speaker. an output device with a defined opening that allows the passage of sound. The shape of the sound guide hole may include, but is not limited to, a round shape, an oval shape, a square shape, a trapezoidal shape, a rounded square shape, a triangular shape, an irregular shape, and the like. or any combination of them. Also, the number of sound guide holes connected to the acoustic driver 840 or 850 may not be limited to two, and may instead be an arbitrary value such as three, four, six, or the like.

In some embodiments, to reduce far field leakage of acoustic output device 800, acoustic driver 840 may be used to output low frequency sounds of equal (or approximately equal) amplitude and opposite (or approximately opposite) phases through at least two first sound guide holes. Acoustic driver 850 may be used to output high frequency sounds of equal (or approximately equal) amplitude and opposite (or approximately opposite) phase through at least two second sound guide holes. Thus far-field leakage for low-frequency sounds (or high-frequency sounds) can be reduced according to the principle of suppressing acoustic antiphase signals.

In accordance with FIG. 6, 7A and 7B, assuming that the wavelength of the low frequency sound is longer than the wavelength of the high frequency sound, and in order to reduce interference sound cancellation in the near field (for example, near the user's ear), the distance between the first sound guide holes and the distance between the second sound guide holes may have different meanings. For example, assuming that there is a first distance between two first sonic guide holes and a second distance between two second sonic guide holes, the first distance may be greater than the second distance. In some embodiments, the first distance and the second distance may have arbitrary values. Just as an example, the first distance cannot be longer than 40 mm, for example, in the range of 20 mm to 40 mm. The second distance cannot be longer than 12 mm and the first distance can be greater than the second distance. In some embodiments, the first distance cannot be less than 12 mm. The second distance may be less than 7 mm, for example within the range of 3 mm - 7 mm. In some embodiments, the first distance may be 30 mm and the second distance may be 5 mm. As another example, the first distance may be at least twice as long as the second distance. In some embodiments, the first distance may be at least three times longer than the second distance. In some embodiments, the first distance may be at least 5 times longer than the second distance.

As shown in FIG. 8, the acoustic driver 840 may include a transducer 843. The transducer 843 may transmit sound to the first audio duct(s) 847 via an acoustic path 845. The acoustic driver 850 may comprise a transducer 853. The transducer 853 may transmit audio to the second audio duct(s)(- wells) 857 through the acoustic path 855. In some embodiments, the transducer may include, but is not limited to, a gas conductive acoustic output transducer, a bone conductive acoustic output transducer, a hydroacoustic transducer, an ultrasonic transducer, and the like. or any combination of them. In some embodiments, the transducer may be a moving coil type, an electromagnetic type, a piezoelectric type, an electrostatic type, or a magnetostrictive type, and the like. or any combination of them.

In some embodiments, acoustic drivers (such as low frequency acoustic driver 840, high frequency acoustic driver 850) may comprise transducers with different properties or different numbers of transducers. For example, each low frequency acoustic driver 840 and high frequency acoustic driver 850 may have a transducer, and the low frequency acoustic driver 840 and high frequency acoustic driver 850 transducers may have different frequency responses (such as those of a woofer and a tweeter). As another example, low frequency acoustic driver 840 may include two transducers 843 (such as two woofers), and high frequency acoustic driver 850 may comprise two transducers 853 (such as two tweeters).

In some embodiments, the acoustic output device 800 may generate sounds at different frequency ranges by other means, such as a frequency division transducer, frequency division acoustic paths, and the like. When the acoustic output device 800 uses a transducer or acoustic path for sound separation, the frequency separation electronics 810 (eg, the part inside the dotted box in FIG. 8) may be omitted. The source signal may be input to acoustic driver 840 and acoustic driver 850, respectively.

In some embodiments, acoustic output device 800 may use a plurality of transducers to perform signal frequency separation. For example, acoustic driver 840 and acoustic driver 850 may convert an input source signal into a low frequency signal and a high frequency signal, respectively. Namely, through the transducer 843 (such as a subwoofer), the low frequency acoustic driver 840 can convert the source signal into a low frequency sound having a low frequency component. The low frequency sound may be transmitted to the at least two first sound guide holes 847 through at least two different acoustic paths 845. The low frequency sound may then be output to the outside through the first sound guide holes 847. Through the transducer 853 (such as a tweeter), the high frequency acoustic driver 850 can convert the source signal into high frequency audio having a high frequency component. The high frequency sound may be transmitted to the at least two second sound guide holes 857 via at least two different acoustic paths 855. The high frequency sound may then be output to the outside through the second sound guide holes 857.

In some alternative embodiments, the acoustic path (eg, acoustic path 845 and acoustic path 855) connecting the transducer to the sonic pilot hole can influence the nature of the transmitted sound. For example, the acoustic path may introduce some degree of attenuation or change the phase of the transmitted sound. In some embodiments, the acoustic path may include a sound tube, a sound cavity, a resonant cavity, a resonator hole, a sound slot, a tuned network, and the like. or any combination of them. In some embodiments, the implementation of the acoustic path may contain an acoustic resistive material, which may have a certain acoustic impedance. For example, the acoustic impedance may be in the range of 5 µS Rayleigh to 500 µS Rayleigh. Exemplary acoustic resistive materials can include, but are not limited to, plastic, fabric, metal, permeable material, woven material, shielding material or mesh material, porous material, particulate material, polymeric material, and the like. or any combination of them. By setting acoustic paths with different acoustic impedances, it is possible to acoustically filter the sounds output by different transducers. In this case, sounds output through different acoustic paths have different frequency components.

In some embodiments, acoustic output device 800 may use multiple acoustic paths to achieve signal frequency separation. Namely, the source signal can be fed to a certain acoustic driver and converted into sound containing high-frequency and low-frequency components. Sound can travel along an acoustic path having a certain frequency selection characteristic. For example, the sound may travel along an acoustic path with a low frequency response to a corresponding sound guide hole to output the low frequency sound. In this process, high frequency sound components can be absorbed or attenuated through an acoustic path with a low frequency response. Likewise, the sound signal may travel along an acoustic path with a high frequency response to a corresponding sound guide hole to output the high frequency sound. In this process, low frequency sound components can be absorbed or attenuated through an acoustic path with a high frequency response.

In some embodiments, a controller in acoustic output device 800 may cause low frequency acoustic driver 840 to output sound in a first frequency range (i.e., low frequency sound) and cause high frequency acoustic driver 850 to output sound in a second frequency range (i.e., high frequency sound) . In some embodiments, acoustic output device 800 may also include a support structure. The support structure may be used to mount an acoustic driver (such as high frequency acoustic driver 850, low frequency acoustic driver 840) so that the acoustic driver can be positioned away from the user's ear. In some embodiments, the sound guide hole(s) acoustically coupled to the high frequency acoustic driver 850 may be located closer to the user's expected ear position (e.g., external ear canal entrance), while the sound guide hole(s) acoustically coupled to the low frequency acoustic driver 840 may be located farther from the expected position. In some embodiments, the support structure may be used to support the acoustic driver. For example, the support structure may include a body made from various materials such as plastic, metal, and tape. The acoustic driver may be placed in the housing and form a front chamber and a rear chamber corresponding to the acoustic driver. The front chamber may be acoustically coupled to one of at least two sound guide holes corresponding to the acoustic driver. The rear chamber may be acoustically coupled to another of at least one of two sound guide holes corresponding to the acoustic driver. For example, the front chamber of the low frequency acoustic driver 840 may be acoustically coupled to one of the at least two first sound guide holes 847. The rear chamber of the low frequency acoustic driver 840 may be acoustically coupled to the other of at least one of the first two sound guide holes 847. the high frequency acoustic driver chamber 850 may be acoustically coupled to one of the at least two second sound guide holes 857. The rear chamber of the high frequency acoustic driver 850 may be acoustically coupled to the other of the at least two second sound guide holes 857. a guide hole (such as the first sound guide hole(s) 847 and the second sound guide hole(s) 857) may be located on the body.

The above description of the acoustic output device 800 may be provided merely as an example. Changes and corrections in design, quantity, etc. may be made by those skilled in the art. acoustic driver, which is not limited in the present invention. In some embodiments, acoustic output device 800 may comprise any number of acoustic drivers. For example, acoustic output device 800 may comprise two groups of high frequency acoustic drivers 850 and two groups of low frequency acoustic drivers 840, or one group of high frequency acoustic drivers 850 and two groups of low frequency acoustic drivers 840 and these high/low frequency drivers can be used to generate sound in a specific frequency range. , respectively. As another example, acoustic driver 840 and/or acoustic driver 850 may include an additional signal processor. The signal processor may have the same or a different structural component of the signal processor 820 or 830.

It should be noted that the acoustic output device and its modules shown in FIG. 8 can be implemented in various ways. For example, in some embodiments, the system and modules may be implemented in hardware, software, or a combination thereof. The hardware may be implemented with dedicated logic. The software may be stored in a storage device and may be executed by an appropriate instruction execution system, such as a microprocessor or dedicated hardware. Those skilled in the art will appreciate that the above methods and systems may be implemented in computer executable instructions and/or embedded in a processor control program. For example, the control program may be provided on a medium such as a disc, CD or DVD-ROM, a programmable memory device such as read only memory (eg, firmware), or a storage medium such as an optical medium or a storage medium. electrical signal. The system and modules in the present invention can be implemented not only by the hardware circuit of a programmable hardware device in an ultra-large integrated circuit, logic integrated circuit, field-programmable logic integrated circuit, semiconductor such as a transistor logic chip, field-programmable logic integrated circuit, or programmable logic device. The system and modules in the present invention may also be implemented by software to be executed by different processors, and optionally also by a combination of hardware and software (eg, firmware).

It should be noted that the above description of the acoustic output device 800 and its components is for convenience of description only and is not intended to limit the protection scope of the present invention. It should be understood that those skilled in the art, after understanding the principle of operation of the device, may arbitrarily combine blocks or arbitrarily form an additional substructure for connection with other blocks, without deviating from these principles. For example, the frequency separation electronics 810 may be omitted and source signal frequency separation may be implemented through the internal structure of the low frequency acoustic driver 840 and/or the high frequency acoustic driver 850. As another example, the signal processor 820 or 830 may be part independent of the electronic module 810 frequency separation. These changes may fall within the protection scope of the present invention.

In FIG. 9A and 9B show exemplary acoustic output devices in accordance with some embodiments of the present invention. For purposes of illustration, sounds output from different sound guide holes associated with the same transducer may be described as an example. In FIG. 9A and 9B, each transducer may have a front side and a back side, and a front chamber and a rear chamber may exist on the front and rear side of the transducer, respectively. In some embodiments, these structures may have the same or approximately the same equivalent acoustic impedance, so the transducer can be loaded symmetrically. The transducer's symmetrical load may form sound sources satisfying the amplitude and phase relationship at the different sound holes (such as "two point sources" having the same amplitude and opposite phases, as described above), so that in the high frequency range and/or low-frequency range, a certain sound field can be generated (for example, sound in the near field can be amplified and leakage sound in the far field can be suppressed).

As shown in FIG. 9A and 9B, an acoustic driver (eg, acoustic driver 910 or 920) may include transducers and acoustic paths and sound guide holes coupled to the transducers. In order to more clearly describe the actual application scenario of the acoustic output device, the position of the user's ear E for explanation is shown in FIG. 9A and 9B. In FIG. 9A shows an application scenario for an acoustic driver 910. The acoustic driver 910 may include a transducer 943 (or referred to as a low frequency acoustic driver) and the transducer 943 may be connected to the first two sound guide holes 947 via an acoustic path 945. FIG. 9B shows an application scenario for an acoustic driver 920. The acoustic driver 920 may include a transducer 953 (or referred to as a high frequency acoustic driver) and the transducer 953 may be coupled to two second sound guide holes 957 via an acoustic path 955.

The transducer 943 or 953 can vibrate when excited by an electrical signal, and the vibration can form sounds with equal amplitudes and opposite phases (180 degree inversion). The transducer type may include, but is not limited to, an air conduction speaker, a bone conduction speaker, a hydroacoustic transducer, an ultrasonic transducer, and the like. or any combination of them. The transducer may be a moving coil type, an electromagnetic type, a piezoelectric type, an electrostatic type, a magnetostrictive type, and the like. or any combination of them. In some embodiments, transducer 943 or 953 may include a vibrating diaphragm that can vibrate when driven by an electrical signal, and the front and rear sides of the vibrating diaphragm can simultaneously output normal phase audio and reverse phase audio. In FIG. 9A and 9B, “+” and “−” may be used to represent sounds with different phases, where “+” may represent a normal phase sound and “−” may represent a reverse phase sound.

In some embodiments, the implementation of the transducer may be enclosed within the housing of the support structure and the interior of the housing may be provided with sound channels connected to the front and rear sides of the transducer, respectively, thus forming an acoustic path. For example, the front cavity of the transducer 943 may be connected to one of the first two sonic guide holes 947 through the first acoustic path (i.e., through half of the acoustic path 945), and the rear cavity of the transducer 943 may be acoustically connected to the other of the two sonic guide holes. the first sound guide holes 947 through the second acoustic path (ie, through the other half of the acoustic path 945). The normal phase sound and the reverse phase sound output from the transducer 943 can be output from the first two sound guide holes 947, respectively. As another example, the front cavity of the transducer 953 may be connected to one of the two sonic guide holes 957 through a third acoustic path (i.e., through half of the acoustic path 955), and the rear cavity of the transducer 953 may be connected to the other of the two sonic guide holes. second sound guide holes 957 through the fourth acoustic path (ie, through the other half of the acoustic path 955). The normal phase sound and the reverse phase sound output from the transducer 953 can be output from the two second sound guide holes 957, respectively.

In some embodiments, the implementation of the acoustic path may affect the nature of the transmitted sound. For example, the acoustic path may introduce some degree of attenuation or change the phase of the transmitted sound. In some embodiments, the acoustic path may comprise one or more of the following: a sound tube, a sound cavity, a resonant cavity, a sound hole, a sound slot, a tuning network, and the like. or any combination of them. In some embodiments, the implementation of the acoustic path may contain an acoustic resistive material, which may have a certain acoustic impedance. For example, the acoustic impedance may be in the range of 5 µS Rayleigh to 500 µS Rayleigh. In some embodiments, the acoustic resistive material may include, but is not limited to, plastic, textile, metal, permeable materials, woven materials, shielding materials and mesh materials, and the like. or any combination of them. In some embodiments, to prevent differently distributed sound transmitted by the front chamber and rear chamber of the acoustic driver, the front chamber and rear chamber corresponding to the acoustic driver may have approximately the same equivalent acoustic impedance. In addition, sound guide holes with the same acoustic resistive material, the same sizes and/or shapes, etc. can be used.

The distance between the first two sound guide holes 947 of the low frequency acoustic driver may be referred to as d ₁ (ie, the first distance). The distance between the two second sound guide holes 957 of the high frequency acoustic driver may be referred to as d ₂ (ie the second distance). By setting the distances d ₁ and d ₂ , a higher volume of the sound output in the low frequency band and a higher ability to reduce sound leakage in the high frequency band can be achieved. For example, the distance between the first two sonic guide holes 947 is greater than the distance between the two second sonic guide holes 957 (ie, d ₁ > d ₂ ).

In some embodiments, transducer 943 and transducer 953 may be housed together in an acoustic output device housing and separately housed in the housing structure.

In some embodiments, the acoustic output device may comprise multiple sets of high frequency acoustic drivers and low frequency acoustic drivers. For example, an acoustic output device may comprise a set of high frequency acoustic drivers and a set of low frequency acoustic drivers in order to simultaneously output sound to the left and/or right ears. As another example, an acoustic output device may comprise two sets of high frequency acoustic drivers and two sets of low frequency acoustic drivers, where one set of high frequency acoustic drivers and one set of low frequency acoustic drivers may be used to output sound to the user's left ear and the other set of high frequency acoustic drivers and another set of low frequency acoustic drivers can be used to output sound to the user's right ear.

In some embodiments, the high frequency acoustic driver and the low frequency acoustic driver may have different powers. In some embodiments, the low frequency acoustic driver may have a first power, the high frequency acoustic driver may have a second power, and the first power may be greater than the second power. In some embodiments, the first power and the second power may have arbitrary values.

In FIG. 10A, 10B, and 10C are audio output scenarios in accordance with some embodiments of the present invention.

In some embodiments, an acoustic output device may produce sounds in the same frequency range through two or more transducers and the sounds may be output through different sound guide holes. In some embodiments, different transducers may be controlled by the same controller or by different controllers, respectively, and may produce sounds that satisfy certain phase and amplitude conditions (e.g., sounds with the same amplitude but opposite phases, sounds with different amplitudes and opposite phases). , etc.). For example, the controller may supply two low-frequency transducers of an acoustic driver with electrical signals having the same amplitude and opposite phases. In this way, two low-frequency transducers can create low-frequency sounds with the same amplitude but opposite phases.

Specifically, these two transducers in an acoustic driver (such as a low frequency acoustic driver 1010 or a high frequency acoustic driver 1020) may be placed side by side in an acoustic output device, one of which may be used to output sound from normal phase and the other may be used to output sound from opposite phase. As shown in FIG. 10A, acoustic driver 1010 may include two transducers 1043, two acoustic paths 1045, and two first audio guide holes 1047. As shown in FIG. 10B, an acoustic driver 1050 may include two transducers 1053, two acoustic paths 1055, and two second sound guide holes 1057. Driven by electrical signals with opposite phases, these two transducers 1043 can generate a series of low frequency sounds with opposite phases (180 degree inversion). One of the two transducers 1043 (such as the transducer below) may produce normal phase audio, and the other (such as the transducer above) may produce reverse phase audio. Two low-frequency sounds with opposite phases can be transmitted to the first two sound guide holes 1047 through two acoustic paths 1045, respectively, and pass out through the first two sound guide holes 1047. Similarly, driven by electrical signals with opposite phases, these two transducers 1053 can form a set of high frequency sounds with opposite phases (180 degree inversion). One of the two transducers 1053 (such as the transducer located below) can output high frequency sound with normal phase, and the other (such as the transducer located above) can output high frequency sound with opposite phase. High frequency sounds with opposite phases can be transmitted to the two second sound guide holes 1057 through two acoustic paths 1055, respectively, and exit through the two second sound guide holes 1057.

In some embodiments, the two transducers in an acoustic driver (e.g., low frequency acoustic driver 1043 and high frequency acoustic driver 1053) may be located relatively close to each other along a straight line, and one of them may be used to output sound with normal phase and the other can be used to output audio with reversed phase.

As shown in FIG. 10C, the left side shows the acoustic driver 1010 and the right side shows the acoustic driver 1020. The two transducers 1043 of the acoustic driver 1010 can generate a set of low frequency sounds with the same amplitude and opposite phases under the control of the controller, respectively. One of the transducers 1043 may output the low frequency sound with normal phase and transmit the low frequency sound with normal phase through the first acoustic path to the first sound guide hole 1047. The other transducer 1043 may output the low frequency sound with opposite phase and transmit the low frequency sound with opposite phase through the second acoustic path. to the other first sound guide hole 1047. The two transducers 1053 of the acoustic driver 1020 can produce high frequency sounds of equal amplitude and opposite phases under the control of the controller, respectively. One of the transducers 1053 can output high frequency sound with normal phase and transmit high frequency sound with normal phase through the third acoustic path to the second sound guide hole 1057. The other transducer 1053 can output high frequency sound with opposite phase and transmit high frequency sound with opposite phase through the fourth acoustic path. to the other second sound guide hole 1057.

In some embodiments, transducer 1043 and/or transducer 1053 may be of various suitable types. For example, transducer 1043 and transducer 1053 may be dynamic coil speakers, which may have characteristics of high sensitivity at low frequency, high depth at low frequency, and low distortion. As another example, transducer 1043 and transducer 1053 may be electromagnetic speakers that may have the characteristics of small size, high sensitivity, and large high frequency range. As another example, transducers 1043 and 1053 may be air conduction speakers or bone conduction speakers. As yet another example, transducer 1043 and transducer 1053 may be balanced armature speakers. In some embodiments, transducer 1043 and transducer 1053 may be of different types. For example, transducer 1043 may be an electromagnetic speaker and transducer 1053 may be a moving coil speaker. As another example, transducer 1043 may be a dynamic coil speaker and transducer 1053 may be an electromagnetic speaker.

In FIG. 10A-10C, the distance between two point sources of acoustic driver 1010 may be d ₁ , the distance between two point sources of acoustic driver 1020 may be d ₂ , and d ₁ may be greater than d ₂ . As shown in FIG. 10C, the listening position (ie, the position of the external auditory canal when the user is wearing the acoustic output device) may be approximately in line with the set of two point sources. In some embodiments, the listening position may be determined at any suitable position. For example, the listening position may be determined on a circle centered on the center point of these two point sources. As another example, the listening position may be on the same side of two lines of two sets of point sources.

It should be understood that the simplified structure of the acoustic output device shown in FIG. 10A-10C may be merely an example and should not serve as a limitation of the present invention. In some embodiments, an acoustic output device may include a support structure, a controller, a signal processor, and the like. or any combination of them.

In FIG. 11A and 11B schematically show an acoustic output device in accordance with some embodiments of the present invention.

In some embodiments, acoustic drivers (eg, acoustic drivers 1043 or 1053) may comprise multiple narrowband speakers. As shown in FIG. 11A, an acoustic output device may include a plurality of narrowband speakers and a signal processing module. On the left or right side of the user, the acoustic output may comprise n groups of narrowband loudspeaker units, respectively. Each group of narrowband loudspeakers may have different frequency responses, and the frequency response of each group may be complementary and collectively cover the frequency band of the audio being heard. The narrowband speaker unit used here may be an acoustic driver with a narrower frequency response range than a low frequency acoustic driver and/or a high frequency acoustic driver. Taking the speaker located on the left side of the user, as shown in FIG. 11A, as an example: A1~An and B1~Bn form n groups of two point sources. When applying the same electrical signal, every two point sources can form sounds with different frequency ranges. By setting the distance d _n for each two point sources, the far field and near field sound can be adjusted for each frequency band. For example, to increase near-field volume and reduce far-field leakage, the distance between a pair of two high frequency point sources may be less than the distance between a pair of two low frequency point sources.

In some embodiments, the signal processing module may include an Equalizer (EQ) processing module and a Digital Signal Processor (DSP) processing module. The signal processing module can be used to implement signal equalization and other digital signal processing algorithms (such as amplitude modulation and phase modulation). The processed signal can be coupled to an appropriate acoustic driver (eg a narrow band speaker) to output sound. Preferably, the narrowband loudspeaker may be a dynamic coil loudspeaker or an electromagnetic loudspeaker. In some embodiments, the narrowband loudspeaker unit may be a balanced armature loudspeaker. Two point sources can be created using two balanced armature speakers, and the sound output from the two speakers can be in opposite phases.

In some embodiments, an acoustic driver (such as acoustic driver 840, 850, 1040, or 1050) may comprise multiple sets of full-band speakers. As shown in FIG. 11B, the acoustic output device may comprise a plurality of full-band loudspeaker units and a signal processing module. On the left or right side of the user, the acoustic output device may contain n groups of loudspeaker units for the entire band, respectively. Each full band loudspeaker block may have the same or similar frequency response and may cover a wide range of frequencies.

Taking as an example the speaker units located on the left side of the user, as shown in FIG. 11B: A1~An and B1~Bn form n groups of two point sources. The difference between Fig. 11A and 11B may conclude that the signal processing module in FIG. 11B may include at least one set of filters for performing frequency separation of the sound source signal so as to generate electrical signals corresponding to different frequency bands, and electrical signals corresponding to different frequency bands can be applied to each loudspeaker group for the entire band. Thus, each group of loudspeaker units (like two point sources) can separately produce sounds with different frequency ranges.

In FIG. 12A-12C schematically show acoustic paths in accordance with some embodiments of the present invention.

As described above, an acoustic filter structure can be created by installing structures such as a sound tube, a sound cavity, and a sound resistor in an acoustic path to achieve sound frequency separation. In FIG. 12A-12C are schematic block diagrams of audio frequency separation using an acoustic path. It should be noted that FIG. 12A-12C may be examples of setting up an acoustic path when using an acoustic path to perform audio frequency separation, and are not meant to be limiting to the present invention.

As shown in FIG. 12A, the acoustic path may comprise one or more groups of translucent structures connected in series, and an acoustic resistive material may be provided in the translucent structures to adjust the acoustic impedance of the entire structure to achieve a filtering effect. In some embodiments, band pass filtering or low pass filtering can be performed on audio by adjusting the size of the lumen structure and/or acoustic resistive material to achieve audio frequency separation. As shown in FIG. 12B, a design with one or more sets of resonant cavities (eg, a Helmholtz cavity) can be created on a branch of the acoustic path, and a filtering effect can be achieved by adjusting the size of each resonant cavity and the acoustic impedance material. As shown in FIG. 12C, a combination of a lumen structure and a resonating cavity (eg, a Helmholtz cavity) can be designed in the acoustic path and a filtering effect can be achieved by adjusting the size of the lumen structure and/or the resonating cavity and/or the acoustic resistive material.

In FIG. 13 shows the sound leakage curve of an acoustic output device (eg acoustic output device 800) using two sets of two point sources (a set of two high frequency point sources and a set of two low frequency point sources). The frequency separation points of two sets of two point sources may be approximately 700 Hz.

The normalization parameter α can be used to estimate the loudness of the leak sound (descriptions of α can be found in equation (4)). As shown in FIG. 13, compared with a single point source, two sets of two point sources can have a higher sound leakage reduction capability. In addition, compared with an acoustic output device provided with only one set of two point sources, two sets of two point sources can output high frequency sounds and low frequency sounds separately. The distance between two low frequency point sources may be greater than the distance between two high frequency point sources. In the low frequency range, by setting a larger distance (d ₁ ) between two low frequency point sources, the increase in the sound volume in the near field can be larger than the increase in the volume of the leakage sound in the far field, which can reach a higher volume of the near field sound output in the low frequency strip. At the same time, in the low frequency range, since the low frequency sound leakage of two low frequency point sources is very small, increasing the distance d ₁ may increase the sound leakage a little. In the high frequency range, by setting a small distance (d ₂ ) between two high frequency point sources, the problem that the high frequency sound leakage reduction critical frequency is too low and the sound frequency range of the sound leakage is shortened is too small and can be overcome. Therefore, by setting the distance d ₁ and/or the distance d ₂ , the acoustic output device provided in the embodiments of the present invention can obtain a higher leakage sound suppression capability than an acoustic output device having a single point source or a single set of two point sources.

In some embodiments, which are influenced by factors such as circuit filter response, transducer frequency response, and acoustic path frequency response, the actual low and high frequency audio characteristics of the acoustic output device may differ from those shown in FIG. 13. In addition, low frequency and high frequency sounds may have a certain overlap (overlap) in the frequency band near the crossover point, causing no change in the overall sound leakage reduction of the acoustic output device at the crossover point, as shown in FIG. 13. Instead, a smooth slope and/or transition in the frequency band near the split point is possible, as shown by the thin solid line in FIG. 13. It should be understood that these differences may not affect the overall acoustic output leakage reduction effect provided by the embodiments of the present invention.

In accordance with FIG. 8-13 and accompanying descriptions, the acoustic output device provided by the present invention can be used to output sounds in various frequency bands by installing high-frequency point-to-point sources and low-frequency point-to-point sources, thus achieving a better acoustic output effect. In addition, by installing different sets of point-to-point sources with different distances, the acoustic output device can have a higher ability to reduce sound leakage in the high frequency band and meet the requirements of an open acoustic output device.

In some alternative embodiments, the acoustic output device may comprise at least one acoustic driver, and the sound produced by the at least one acoustic driver may propagate outwardly through at least two sound guide holes associated with the at least one acoustic driver. In some embodiments, the acoustic exit device may be provided with a dividing structure so that at least two sound guide holes can be distributed on two sides of the baffle. In some embodiments, at least two sound guide holes may be distributed on both sides of the user's pinna. In this case, the pinna may serve as a baffle that separates the at least two sound guide holes so that the at least two sound guide holes can have different acoustic paths to the user's external ear canal. Additional description of point-to-point sources and baffles can be found in International Applications No. PCT/CN2019/130921 and No. PCT/CN2019/130942, both filed December 31, 2019, the entire contents of each of which are hereby incorporated into the present invention by reference.

In FIG. 14 schematically shows another exemplary acoustic output device 1400 in accordance with some embodiments of the present invention. As shown in FIG. 14, the acoustic output device 1400 may include a support structure 1410 and an acoustic driver 1420 embedded in the support structure 1410. structure 1410. At the same time, the support structure 1410 and the acoustic driver 1420 may approach, but not block, the external auditory canal so that the user's ear can remain open and the user can thus hear both the sound coming from the acoustic output device 1400, as well as environmental sounds. For example, acoustic output device 1400 may be positioned around or partially around the user's ear and transmit sounds via air conduction or bone conduction.

The support structure 1410 may be used to be worn on a user's body and include one or more acoustic drivers 1420. In some embodiments, the support structure 1410 may be a nested shell structure having a hollow interior, and one or more acoustic drivers 1420 may be positioned within support structure 1410. In some embodiments, the acoustic output device 1400 may be combined with an item such as glasses, a headset, a display, an AR/VR helmet, and so on. In such a case, the support structure 1410 may be attached near the user's ear with a hook or clip. In some alternative embodiments, the holder may be mounted on the support structure 1410 and the shape of the holder may conform to the shape of the user's ear such that the acoustic output device 1400 can be independently worn on the user's ear with the holder. Acoustic output device 1400 can communicate with a signal source (eg, computer, mobile phone, or other mobile devices) in a wired or wireless manner (eg, via Bluetooth). For example, the acoustic output device 1400 in the left and right ears may have a direct wireless connection to the signal source. As another example, the acoustic output device 1400 in the left and right ears may comprise a first output device and a second output device. The first output device may be in communication with the signal source, and the second output device may be wirelessly connected to the first output device wirelessly. The audio outputs of the first output device and the second output device may be synchronized via one or more clock signals. The wireless connection disclosed herein may include, but is not limited to, a connection via Bluetooth, local area network, wide area network, wireless personal area network, near field communication, and the like. or any combination of them.

In some embodiments, the support structure 1410 may have a shell structure with a shape suitable for human ears, such as a circular ring, an oval, a polygonal (regular or irregular) shape, a U-shape, a V-shape, a semi-circle shape, so that the support structure 1410 could be directly engaged with the user's ear. In some embodiments, the support structure 1410 may include one or more fixed structures. The fixed structure(s) may include a behind-the-ear holder, a headband, or a rubber band so that the acoustic output device 1400 can be better secured to the user, preventing them from falling. Just by way of example, a rubber band can be a headband worn on the head by wrapping it around the head. As another example, the rubber band may be a collar band worn around the neck to wrap around the neck/shoulder area. In some embodiments, the rubber band may be a continuous band and resiliently stretchable to be worn on the wearer's head. In such a case, the rubber band may also exert pressure on the user's head so that the acoustic output device 1400 can be secured to the user's head in a certain position. In some embodiments, the rubber band may be a combination band. For example, a rubber band may include a rigid portion and a flexible portion. The rigid section may be made of a hard material (eg, plastic or metal) and the rigid section may be attached to the support structure 1410 of the acoustic output device 1400 by a physical connection. The flexible portion may be made from an elastic material (eg, fabric, composite, and/or neoprene).

In some embodiments, when the user is wearing the acoustic output device 1400, the support structure 1410 may be positioned above or below the pinna. The sound transmission support structure 1410 may be provided with a sound guide hole 1411 and a sound guide hole 1412. sounds through the sonic guide hole 1411 and the sonic guide hole 1412.

Acoustic driver 1420 may be a component that can receive an electrical signal and convert the electrical signal into an audio signal for output. In some embodiments, in terms of frequency, the type of acoustic driver 1420 may comprise a low frequency acoustic driver, a high frequency acoustic driver, or a full range acoustic driver, or any combination thereof. In some embodiments, acoustic driver 1420 may be moving coil, electromagnetic, piezoelectric, electrostatic, magnetostrictive, and the like. or a combination of them.

In some embodiments, acoustic driver 1420 may include a vibrating diaphragm. When the vibrating diaphragm vibrates, sounds can be transmitted from the front and back sides of the vibrating diaphragm, respectively. In some embodiments, the front side of the vibratory diaphragm in the support structure 1410 may be provided with a front chamber 1413 for sound transmission. The front chamber 1413 may be acoustically coupled to the sound guide hole 1411. The sound at the front side of the vibrating diaphragm may be output from the sound guide hole 1411 through the front chamber 1413. The reverse side of the vibrating diaphragm in the support structure 1410 may be provided with a rear chamber 1414 for sound transmission. The rear chamber 1414 may be acoustically coupled to the sonic guide hole 1412. Sound from the back side of the vibrating diaphragm may be output from the sonic guide hole 1412 through the rear chamber 1414. form sounds with opposite phases. After passing through the front chamber 1413 and the rear chamber 1414, respectively, sounds can exit the sound guide hole 1411 and the sound guide hole 1412, respectively. In some embodiments, by adjusting the structures of the front chamber 1413 and the rear chamber 1414, the sounds output by the acoustic driver 1420 to the sound guide hole 1411 and the sound guide hole 1412 can suit specific conditions. For example, by adjusting the length of the front chamber 1413 and the rear chamber 1414, the sound guide hole 1411 and the sound guide hole 1412 can output sounds with a certain phase relationship (eg, with opposite phases). Therefore, the problems comprising a small volume of sound heard by a user in the near field of the acoustic output device 1400 and a large amount of sound leakage in the far field of the acoustic output device 1400 can be effectively resolved.

In some alternative embodiments, the acoustic driver 1420 may also comprise a plurality of vibration diaphragms (eg, two vibration diaphragms). Each of the plurality of vibrating diaphragms can vibrate to generate sound that can pass through a cavity connected to the vibrating diaphragm in the support structure and be output from the respective sound guide hole(s). A plurality of vibrating diaphragms can be controlled by the same controller or different controllers and form sounds that satisfy certain phase and amplitude conditions (for example, sounds of the same amplitude but with opposite phases, sounds with different amplitudes and opposite phases, etc.).

As mentioned above, at a certain sound frequency, as the distance between the two point sources increases, the volume of the sound heard by the user and the volume of the leak sound corresponding to the two point sources may increase. To more clearly describe the relationship between the loudness of the sound heard by the user, the loudness of the sound of the leak, and the distance d between point sources, can be further explained based on FIG. 15-17.

In FIG. 15 schematically shows two point sources and a listening position in accordance with some embodiments of the present invention. As shown in FIG. 15, the point source a ₁ and the point source a ₂ may be on the same side of the listening position. The point source a ₁ may be closer to the listening position, and the point source a ₁ and the point source a ₂ may output sounds with the same amplitude but opposite phases.

In FIG. 16 is a graph showing the change in loudness of audio heard by a user from two point sources at different distances as a function of audio frequency in accordance with some embodiments of the present invention. The abscissa can represent the frequency (f) of the sound output from these two point sources (denoted as a ₁ and a ₂ ), and the frequency unit is Hertz (Hz). The ordinate can represent the loudness of a sound and its unit is the decibel (dB). As shown in FIG. 16, as the distance between the point source a ₁ and the point source a ₂ gradually increases (for example, from d to 10d), the sound volume at the listening position may gradually increase. That is, as the distance between the point source a ₁ and the point source a ₂ increases, the difference in sound pressure amplitudes (i.e., sound pressure difference) between two sounds reaching the listening position may become larger, making the sound canceling effect weaker, which can increase the sound volume in the listening position. However, due to the existence of sound suppression, the volume of the sound at the listening position may be even less than the volume of the sound generated by a single point source at the same position in the low and medium frequency band (for example, for frequencies below 1000 Hz). However, in the high frequency band (for example, for frequencies close to 10,000 Hz), due to the reduction in the wavelength of sound, a mutual improvement in sound may occur, making the sound generated by these two point sources louder than the sound from a single point source. In some embodiments, sound pressure may refer to the pressure generated by sound due to air vibration.

In some embodiments, by increasing the distance between two point sources (eg, between point source a ₁ and point source a ₂ ), the sound volume at the listening position can be increased. But as the distance increases, the sound suppression of these two point sources may become weak, which may lead to an increase in sound leakage in the far field. For purposes of illustration, in FIG. 17 is a graph showing the change in the normalized parameter of various distances between two point sources in the far field versus the frequency of sound in accordance with some embodiments of the present invention. The abscissa can represent the frequency (f) of a sound, the unit of which can be Hertz (Hz). The ordinate can use the normalization parameter α to estimate the loudness of the leak sound and the unit can be decibel (dB). As shown in FIG. 17, taking the normalization parameter α of a single point source as the reference, as the distance between two point sources increases from d to 10d, the normalization parameter α may gradually increase, indicating that sound leakage may gradually increase. Additional description regarding the normalization parameter α can be found in equation (4) and accompanying descriptions.

In some embodiments, the addition of a baffle structure to the acoustic output device may be advantageous in order to improve the output effect of the acoustic output device, i.e., increase the sound intensity at the near field listening position while reducing the sound leakage volume in the far field. For illustration in FIG. 18 shows an exemplary baffle provided between two point sources in accordance with some embodiments of the present invention. As shown in FIG. 18, when a baffle is placed between point source a ₁ and point source a ₂ in the near field, the sound wave of point source a ₂ will need to bypass the baffle to interfere with the sound wave of point source a ₁ at the listening position, which may be equivalent to increasing the acoustic path length from point source a ₂ to your listening position. Therefore, assuming that the point source a ₁ and the point source a ₂ have the same amplitude, compared with the case without a baffle, the difference in the amplitudes of the sound waves of the point source a ₁ and the point source a ₂ at the listening position can increase, so that the degree of suppression of the two sounds at the listening position may decrease, causing the sound volume at the listening position to increase. In the far field, since the sound waves generated by the point source a ₁ and the point source a ₂ do not need to bypass the partition in a large space, the sound waves can interfere (similar to the case without a screen). Compared with the case without a screen, the far-field sound leakage cannot increase significantly. Therefore, the screen structure provided between the point source a ₁ and the point source a ₂ can significantly increase the sound volume at the near-field listening position, while the far-field sound leakage volume does not increase significantly.

In the present invention, when two point sources are located on both sides of the pinna, the pinna may serve as a septum, so that the pinna may also be referred to as a septum for convenience. As an example, due to the existence of the auricle, the result can be equivalent to when sound in the near field is generated by two point sources with distance D1 (also known as mode 1). Far field sound can be generated by two point sources with distance D2 (also known as mode 2) and D1 > D2. In FIG. 19 is a plot of the volume of the sound heard by the user as a function of the frequency of the sound when the pinna is positioned between two point sources, in accordance with some embodiments of the present invention. As shown in FIG. 19, when the frequency is low (for example, when the frequency is less than 1000 Hz), the loudness of the near field sound (that is, the sound heard by the user through the user's ear) may basically be the same as the loudness of the near field sound in mode 1, be greater than the near-field audio volume in mode 2 and be close to the near-field audio volume for a single point source. As the frequency increases (for example, a frequency between 2000 Hz and 7000 Hz), the sound volume in the near field in mode 1, when two point sources are distributed on both sides of the pinna, may be greater than the volume of a single point source. This shows that when the user's ear is located between two point sources, the volume of the near field sound transmitted from the sound source to the user's ear can be effectively increased. In FIG. 20 is a plot of leakage sound loudness as a function of sound frequency when the pinna is positioned between two point sources, in accordance with some embodiments of the present invention. As shown in FIG. 20, as the frequency increases, the far-field leakage volume may increase. When two point sources are distributed on both sides of the pinna, the volume of the far-field leakage sound generated by these two point sources can be basically the same as the volume of the far-field leakage sound in mode 2, and both of them can be smaller than the loudness of the far-field leakage sound in mode 1 and the far-field leakage sound of a single point source. This shows that when the ear of the user is located between two point sources, the sound transmitted from the sound source to the far field can be effectively reduced, that is, the sound leakage from the sound source to the environment can be effectively reduced. In FIG. 21 shows a plot of the normalized parameter as a function of sound frequency when two acoustic output point sources are distributed on both sides of the pinna, in accordance with some embodiments of the present invention. As shown in FIG. 21, when the frequency is less than 10000 Hz, the normalized parameter of the two point sources distributed on both sides of the auricle may be less than the normalized parameter in the case of mode 1 (no baffle between two point sources and the distance is D1), mode 2 (no baffle between two point sources and the distance is D2) and a single point source, which may indicate that when two point sources are located on both sides of the pinna, the acoustic output device may have better sound leakage suppression capability.

In order to further explain the effect of an acoustic output device with and without a baffle between two point sources or two sound guide holes, the sound volume in the near field at the listening position and/or the volume of the leakage sound in the far field under various conditions can be specifically described below.

In FIG. 22 is a plot of user-audible loudness and leak loudness as a function of baffled and unbaffled sound frequency between two point sources, in accordance with some embodiments of the present invention. As shown in FIG. 22, after adding a baffle between two point sources (i.e., two sound guide holes) of the acoustic output device in the near field, it can be equivalent to increasing the distance between these two point sources, and the sound volume at the near field listening position can be equivalent to the volume , created by a set of two point sources with a large distance. The sound volume in the near field can be greatly increased compared to the case without a baffle. In the far field, since the interference of sound waves generated by two point sources can rarely be affected by a baffle, the sound leakage can be equivalent to the leakage generated by two point sources with a short distance, so the sound leakage cannot change significantly between the presence of a baffle and its absence. It can be seen that by installing a baffle between two sound guide holes (i.e., two point sources), the ability of the acoustic output device to reduce sound leakage can be effectively improved, and the sound volume in the near field of the acoustic output device can be significantly increased. Therefore, the requirements for the sound-forming components of the acoustic output device can be reduced. At the same time, a simple circuit structure can reduce the electrical loss of the acoustic output device, so that under a certain power supply life, the operating time of the acoustic output device can be significantly extended.

In FIG. 23, in accordance with some embodiments of the present invention, is a plot of the loudness of the sound heard by the user and the loudness of the leak sound as a function of the distance between two point sources when the frequency of the two point sources is 300 Hz. In FIG. 24, in accordance with some embodiments of the present invention, is a plot of the loudness of the sound heard by the user and the loudness of the leak sound as a function of the distance between two point sources when the frequency of the two point sources is 1000 Hz. As seen in FIG. 23 and 24, in the near field, when the frequency is 300 Hz or 1000 Hz, as the distance d of these two point sources increases, the volume of the sound heard by the user with a partition between the two point sources may be greater than the volume of the sound without a partition between these two point sources, which indicates that at this frequency, the partition structure between these two point sources can effectively increase the volume of the sound heard by the user in the near field. In the far field, the sound volume of a leak with a baffle between these two point sources can be equivalent to the volume of sound without a baffle between these two point sources, indicating that at this frequency, the presence or absence of a baffle structure located between the two point sources has little effect on the sound leakage effect. in the far field.

In FIG. 25, in accordance with some embodiments of the present invention, is a graph of the loudness of the sound heard by the user and the loudness of the leak sound as a function of distance when the frequency of the two point sources is 5000 Hz. As shown in FIG. 25, in the near field, when the frequency is 5000 Hz, as the distance d between the two point sources increases, the volume of the sound heard by the user when there is a barrier between the two point sources can be greater than when there is no barrier. In the far field, the leakage sound volume of these two point sources, with or without a baffle, can fluctuate as a function of the distance d. In general, whether the baffle structure is located between these two point sources has little effect on far-field leakage.

In FIG. 26-28, in accordance with some embodiments of the present invention, graphs of the change in the loudness of the sound heard by the user as a function of the frequency of the sound when the distance d between two point sources is 1 cm, 2 cm, 3 cm, respectively. In FIG. 29, in accordance with some embodiments of the present invention, shows a plot of the normalized far-field parameter as a function of sound frequency when the distance d between two point sources is 1 cm. FIG. 30, in accordance with some embodiments of the present invention, is a plot of the normalized far-field parameter as a function of sound frequency when the distance d between two point sources is 2 cm. FIG. 31, in accordance with some embodiments of the present invention, is a plot of the normalized far field parameter as a function of sound frequency when the distance d between two point sources is 4 cm. As shown in FIG. 26-28, for different distances d between the sound guide holes (for example, 1 cm, 2 cm, 4 cm), at a certain frequency, in the near field, in the listening position in the near field (for example, the user's ear), the sound volume from two sound guide holes located on both sides of the pinna (i.e. the "baffle effect" situation shown in the drawing) may be louder than the volume of sound from two sound guide holes located on the same side of the pinna ( i.e. "no baffle" case as shown in the drawings) The determined frequency may be below 10000 Hz, below 5000 Hz or below 1000 Hz.

As shown in FIG. 29-31, for different distances d between sound guide holes (for example, 1 cm, 2 cm and 4 cm), at a certain frequency, in a position in the far field (for example, a position in the environment away from the user's ear), the volume of the leakage sound , formed when two sound guiding holes are provided on both sides of the auricle, may be smaller than when sound is generated when two sound guiding holes are located on opposite sides of the auricle. It should be noted that as the distance between two sound guide holes or two point sources increases, the interference cancellation of sound at the far-field position may weaken, resulting in a gradual increase in far-field leakage and a decrease in sound leakage reduction capability. Therefore, the distance d between two sound guide holes or two point sources cannot be too large. In some embodiments, to keep the output sound as loud as possible in the near field and suppress sound leakage in the far field, the distance d between two sound guide holes can be set to no more than, for example, 20 cm, 12 cm, 10 cm, 6 cm, etc. .P. In some embodiments, given the size of the acoustic output device and the structural requirements for the sonic guide holes, the distance d between two sonic guide holes can be set in the range of, for example, 1 cm to 12 cm, 1 cm to 10 cm, 1 cm up to 8 cm, from 1 cm to 6 cm, from 1 cm to 3 cm, etc.

It should be noted that the above description is merely for convenience of description and is not intended to limit the protection scope of the present invention. It should be understood that those skilled in the art, after understanding the principle of the present invention, without departing from this principle, may make various modifications and changes in the forms and details of the acoustic output device. For example, in some embodiments, a plurality of sound guide holes may be provided on both sides of the baffle. The number of sound guide holes on both sides of the baffle may be the same or different. For example, the number of sound guide holes on one side of the baffle may be two, and the number of sound guide holes on the other side may be two or three. These modifications and changes may still fall within the protection scope of the present invention.

In some embodiments, assuming the distance between the two point sources is maintained, the listening position with the two point sources may have an effect on near field sound volume and far field sound leakage reduction. To improve the acoustic output effect of the acoustic output device, in some embodiments, the implementation of the acoustic output device may have at least two sound guide holes. The at least two sound guide holes may comprise two sound guide holes located on the front and back sides of the user's ear, respectively. In some embodiments, assuming that sound propagating from a sound guide hole located on the back of the user's ear must bypass the pinna to reach the user's external ear canal, the acoustic path between the sound guide hole located on the front of the ear, and the user's external ear canal (i.e., the acoustic distance from the sound guide hole to the user's external ear canal inlet) is shorter than the acoustic path between the sound guide hole located on the back of the pinna and the user's ear. To further explain the influence of the listening position on the acoustic output effect, four representative listening positions (listening position 1, listening position 2, listening position 3, listening position 4) can be selected as shown in FIG. 32. Listening position 1, listening position 2 and listening position 3 may have an equal distance to the point source a ₁ , which may be equal to r ₁ . The distance between the listening position 4 and the point source a ₁ may be equal to r ₂ and r ₂ < r ₁ . Point source a ₁ and point source a ₂ can respectively produce sounds with opposite phases.

In FIG. 33 is a graph, in accordance with some embodiments of the present invention, of the loudness of sound heard by a user of two point sources without a baffle in various listening positions as a function of sound frequency. In FIG. 34 is a plot of the normalized parameter of various listening positions as a function of sound frequency. The normalized parameter can be obtained by referring to equation (4). As shown in FIG. 33 and 34, for the listening position 1, since the difference between the acoustic paths from the point source a1 and the point source a2 to the listening position 1 is small, the difference in the amplitude of the sounds generated by these two point sources at the listening position 1 may be small. Therefore, the interference of the sounds of these two point sources at the listening position 1 may cause a decrease in the volume of the sound heard by the user compared to other listening positions. For listening position 2, compared to listening position 1, the distance between listening position 2 and point source a ₁ may remain unchanged, that is, the acoustic path from point source a ₁ to listening position 2 may not change. However, the distance between the listening position 2 and the point source a ₂ may be large and the length of the acoustic path between the point source a ₂ and the listening position 2 may increase. The amplitude difference between the sound generated by the point source a ₁ and the sound generated by the point source a ₂ at the listening position 2 may increase. Therefore, the loudness of the sound transmitted from the two point sources after interference at the listening position 2 may be larger than at the listening position 1. Among all positions located on an arc with radius r ₁ , the difference between the acoustic path from the point source a ₁ to the listening position 3 and the acoustic path from the point source a ₂ to the listening position 3 may be the largest. Therefore, compared with the listening position 1 and the listening position 2, the listening position 3 can have the highest volume of the sound heard by the user. For the listening position 4, the distance between the listening position 4 and the point source a ₁ may be short. The sound amplitude of the point source a ₁ at the listening position 4 may be large. Therefore, the volume of the sound heard by the user at the listening position 4 can be large. As a result, the volume of the sound heard by the user in the near field while listening to the position may change as the listening position and the relative position of the two point sources change. When the listening position is on the line between two point sources and on the same side of the two point sources (for example, listening position 3), the difference in acoustic paths between the two point sources at the listening position may be greatest (the difference in acoustic paths may be the distance d between two point sources). sources). In this case (ie, when the auricle is not used as a septum), the volume of the sound heard by the user in this listening position may be greater than in other places. According to equation (4), when the far-field leakage is constant, the normalization parameter corresponding to this listening position may be the smallest, and the leakage reduction capability may be the highest. At the same time, reducing the distance r ₁ between the listening position (for example, listening position 4) and the point source a ₁ can further increase the volume at the listening position, simultaneously reduce sound leakage, and improve the ability to reduce leakage.

In FIG. 35, in accordance with some embodiments of the present invention, is a graph of the loudness of audio heard by a user from two baffled point sources (as shown in FIG. 32) at various near field listening positions as a function of frequency. In FIG. 36 is a graph of the normalization parameters of various listening positions obtained with reference to Equation (4) based on FIG. 35 as a function of frequency. According to FIG. 35 and 36, compared with the case without a baffle, when there is a baffle, the volume of the sound heard by the user generated by the two point sources at the listening position 1 may increase significantly. The volume of the sound heard by the user at the listening position 1 may exceed the volume of the sound heard at the listening position 2 and listening position 3. The reason may be that the acoustic path from the point source a ₂ to the listening position 1 after the installation of a partition between the two point sources may increase. As a result, the difference in acoustic paths between two point sources at listening position 1 can increase significantly. The amplitude difference between the sounds generated by the two point sources at the listening position 1 may increase, making it difficult to perform interference cancellation of the sound, and thus significantly increase the volume of the sound heard by the user generated at the listening position 1. At the listening position 4, since the distance between the position listening and point source a ₁ is further reduced, the sound amplitude of point source a ₁ in this position may be larger. The volume of the sound heard by the user at the listening position 4 may still be the highest among the four listening positions. For listening position 2 and listening position 3, since the effect of the baffle installation result on the acoustic path from point source a ₂ to the two listening positions is not too obvious, the effect of increasing the volume at listening position 2 and at listening position 3 may be less than at position 1 listening position and listening position 4, which are closer to the septum.

The volume of the leakage sound in the far field may not change depending on the listening position, and the volume of the sound heard by the user in the near field listening position may change depending on the listening position. In this case, according to equation (4), the normalization parameter of the acoustic output device may vary in different listening positions. Specifically, a listening position with a large volume of sound heard by a user (for example, listening position 1 and listening position 4) may have a small normalization parameter and a high sound leakage reduction capability. The listening position with a low volume of the sound heard by the user (for example, listening position 2 and listening position 3) may have a large normalization parameter and weak leakage reduction capability.

Therefore, according to the actual application scenario of the acoustic output device, the user's ear can serve as a baffle. In this case, two sound guide holes on the acoustic output device may be located on the front side and back side of the pinna, respectively, and the external auditory meatus may be located between the two sound guide holes as a listening position. In some embodiments, when determining the positions of two sound guide holes on an acoustic output device, the distance between the sound guide hole on the anterior side of the auricle and the external ear canal may be less than the distance between the sound guide hole on the back of the ear and the external ear canal. In this case, the acoustic output device can generate a large amplitude of sound in the external auditory canal, since the sound guide hole on the anterior side of the auricle is close to the external auditory canal. The amplitude of the sound produced by the sound guide hole on the back of the ear can be smaller in the external auditory canal, which can help to avoid interference cancellation of sound in the two sound guide holes near the external ear canal, thus ensuring that the volume of the sound heard by the user in external auditory canal is large. In some embodiments, the acoustic output device may include one or more contact points (eg, a "knee point" on the support structure to conform to the shape of the ear) that may contact the pinna when it is worn. The contact point(s) may be located on the line connecting the two sonic guide holes or on one side of the line connecting the two sonic guide holes. And the ratio of the distance between the front sound guide hole and the contact point(s) to the distance between the rear sound guide hole and the contact point(s) may be 0.05-20. In some embodiments, the implementation of the ratio may be equal to 0.1-10. In some embodiments, the implementation of the ratio may be equal to 0.2-5. In some embodiments, the implementation of the ratio may be equal to 0.4-2.5.

In FIG. 37 schematically shows two point sources and a septum (eg, pinna) in accordance with some embodiments of the present invention. In some embodiments, the position of the baffle between two sound guide holes may have a certain effect on the acoustic output. Just for example, as shown in FIG. 37, a partition can be provided between the point source a ₁ and the point source a ₂ , the listening position can be determined on the line connecting the point source a ₁ and the point source a ₂ . In addition, the listening position can be determined between the point source a ₁ and the partition. The distance between the point source a ₁ and the partition may be L. The distance between the point source a ₁ and the point source a ₂ may be d. The distance between the point source a ₁ and the listening position of the user may be L1. The distance between the listening position and the baffle may be L2. When the distance L1 is constant, moving the baffle may cause different ratios of L to d, thus obtaining different loudnesses of the sound heard by the user in the listening position and/or far-field leakage loudness.

In FIG. 38 is a plot of near field loudness as a function of sound frequency when the baffle is in various positions, in accordance with some embodiments of the present invention. In FIG. 39 is a plot of far field leakage sound loudness as a function of sound frequency when the baffle is in various positions, in accordance with some embodiments of the present invention. In FIG. 40 is a plot of normalization parameter change as a function of sound frequency when the baffle is in various positions, in accordance with some embodiments of the present invention. In accordance with FIG. 38-40, the loudness of the far-field leakage sound may vary slightly by changing the position of the baffle between the two point sources. In a situation where the distance d between the point source a ₁ and the point source a ₂ remains constant, when L decreases, the volume of the sound at the listening position may increase, the normalization parameter may decrease, and the ability to reduce sound leakage may improve. In the same situation, if L is increased, the volume at the listening position may be increased, the normalization parameter may be increased, and the ability to reduce sound leakage may be weakened. The reason for this result may be that when L is small, the listening position may be close to the baffle, the acoustic path of the sound wave from the point source a ₂ to the listening position may be increased due to the baffle. In this case, the acoustic path difference between the point source a ₁ and the point source a ₂ to the listening position may increase and the interference cancellation may decrease. As a result, after adding a baffle, the volume at the listening position may increase. When L is large, the listening position may be far from the partition. The baffle may have little effect on the acoustic path difference between point source a ₁ and point source a ₂ up to the listening position. As a result, the change in volume at the listening position after adding the baffle may be small.

As described above, by assigning the positions of the sound guide holes on the acoustic output device when the user wears the acoustic output device, the pinna of the human body can serve as a baffle to separate the various sound guide holes. In this case, the structure of the acoustic output device can be simplified, and the output of the acoustic output device can be further improved. In some embodiments, the positions of the two sound guide holes can be properly defined so that the ratio of the distance between the sound guide hole on the front side of the pinna and the pinna (or contact point on the acoustic output device intended to contact the pinna) to the distance between two sound guide holes when the user wears the acoustic output device could be less than or equal to 0.5. In some embodiments, the ratio may be less than or equal to 0.3. In some embodiments, the ratio may be less than or equal to 0.1. In some embodiments, the ratio of the distance between the sound guide hole on the anterior side of the pinna and the pinna (or contact point on the acoustic output device intended to contact the pinna) to the distance between the two sound guide holes may be greater than or equal to 0.05. In some embodiments, the second ratio of the distance between the two sound guide holes to the pinna height may be greater than or equal to 0.2. In some embodiments, the second ratio may be less than or equal to 4. In some embodiments, pinna height may refer to pinna length in a direction perpendicular to the sagittal plane.

It should be noted that the acoustic path from the acoustic driver to the audio guide hole in the acoustic output device can have a certain effect on near field audio volume and far field audio leakage. The acoustic path can be changed by adjusting the length of the cavity between the vibrating diaphragm in the acoustic output device and the sound guide hole. In some embodiments, the implementation of the acoustic driver may contain a vibrating diaphragm. The front and back sides of the vibration diaphragm can be connected to the two sound guide holes through the front chamber and rear chamber, respectively. The acoustic paths from the vibrating diaphragm to the two sound guide holes can be different. In some embodiments, the ratio of acoustic path lengths between the vibrating diaphragm and the two sound guide holes may be 0.5-2, 0.6-1.5, or 0.8-1.2, for example.

In some embodiments, while maintaining the phases of the sounds generated in the two sound guide holes, in contrast, the amplitudes of the sounds generated in the two sound guide holes can be changed to improve the output effect of the acoustic output device. Namely, the impedances of the acoustic paths connecting the acoustic driver and the two sound guide holes can be adjusted to correct the amplitude of the sound at each of the two sound guide holes. In some embodiments, the implementation of the impedance may refer to the resistance that the carrier must overcome during the movement, when transmitted acoustic waves. The acoustic paths may or may not be filled with absorbent material (eg, tuning net, tuning clap, etc.) to correct the amplitude of the sound. For example, a resonant cavity, sound hole, sound slot, tuning net, and/or tuning clap may be placed on the acoustic path to adjust the acoustic impedance, thereby changing the impedances of the acoustic path. As another example, the aperture of each of the two sound guide holes can be adjusted to change the acoustic impedance of the acoustic paths corresponding to the two sound guide holes. In some embodiments, the acoustic impedance ratio of the acoustic path between the acoustic driver (vibrating diaphragm) and one of the two sonic guide holes and the acoustic path between the acoustic driver and the other sonic guide hole may be 0.5-2 or 0.8-1.2 .

It should be noted that the above descriptions are merely for illustrative purposes and are not intended to limit the present invention. It should be understood that after understanding the principle of the present invention, various modifications and changes in the forms and details of the acoustic output device can be made by those skilled in the art without departing from this principle. For example, the listening position may not be on a line connecting two point sources, but may also be above, below, or in the direction of an extension of a line connecting those point sources. As another example, the method for measuring the distance from a point source of sound to the pinna and the method for measuring the height of the pinna can also be corrected in accordance with various scenarios. These such changes may all fall within the protection scope of the present invention.

In FIG. 41 shows another exemplary acoustic output device in accordance with some embodiments of the present invention.

To human ears, the frequency band of sound that can be heard can be concentrated in the mid-low frequency band. The purpose of optimization in the lower-mid band may be to increase the volume of the audio heard by the user. If the listening position is fixed, the parameters of the two point sources can be adjusted so that the volume of the sound heard by the user can be significantly increased, while the volume of the sound of the leak can be substantially unchanged (increasing the volume of the sound heard by the user can be more than increasing the volume of the leak sound). In the high frequency band, the leakage sound reduction effect of two point sources may be weaker. In the high frequency band, the optimization goal may be to reduce sound leakage. Sound leakage can be further reduced by adjusting the parameters of the two point sources of different frequencies. In some embodiments, the acoustic output device 1400 may also include an acoustic driver 1430. The acoustic driver 1430 may output sounds from the two second sound guide holes. Details regarding the acoustic driver 1430, the second sound guide holes, and the structure therebetween can be described with reference to the acoustic driver 1420 and the first sound guide holes. In some embodiments, acoustic driver 1430 and acoustic driver 1420 may output sounds of different frequencies. In some embodiments, the acoustic output device may further comprise a controller configured to cause the acoustic driver 1420 to output sound in the first frequency range, and to cause the acoustic driver 1430 to output sound in the second frequency range. The second frequency range may contain higher frequencies than the first frequency range. For example, the first frequency range may have frequencies of 100 Hz - 1000 Hz, and the second frequency range may have frequencies of 1000 Hz - 10000 Hz.

In some embodiments, acoustic driver 1420 may be a woofer and acoustic driver 1430 may be a mid-high frequency speaker. Due to the different frequency response of the subwoofer and the mid-high frequency speaker, the frequency bands of the output sound may also differ. High frequency bands and low frequency bands can be separated by using woofers and mid-high frequency speakers, and respectively, two low-frequency spot sources and two mid-high frequency spot sources can be created to achieve sound output in the near field and reduce sound leakage in the far field. For example, acoustic driver 1420 may provide two point sources for outputting low frequency sound through sound guide hole 1411 and sound guide hole 1412, which can be used primarily for sound output in the low frequency band. Two low-frequency spot sources can be distributed on both sides of the pinna to increase the volume near the ear in the near field. The acoustic driver 1430 may provide two point sources for outputting mid-high frequency sound through the two second sound guide holes. Sound leakage in the mid-high frequency range can be reduced by adjusting the distance between the two second sound guide holes. The two mid-high frequency spot sources can be distributed on both sides of the pinna or on the same side of the pinna. Alternatively, the acoustic driver 1420 may provide two point sources for audio output across the entire frequency range via the audio guide hole 1411 and the audio guide hole 1412 to further increase the volume of near field audio.

Additionally, the distance d ₂ between the two second sound guide holes may be less than the distance d ₁ between the sound guide hole 1411 and the sound guide hole 1412, that is, d ₁ may be greater than d ₂ . For illustration, as shown in FIG. 13, a higher sound leakage reduction capability than a single point source and one set of two point sources can be obtained by installing two sets of two point sources containing one set of two low frequency point sources and one set of two high frequency point sources. with different distances.

It should be noted that the positions of the sound guide holes of the acoustic output device cannot be limited to the case where the two sound guide holes 1411 and 1412 corresponding to the acoustic driver 1420 shown in FIG. 41 are distributed on both sides of the auricle, and in the case where two sound guide holes corresponding to the acoustic driver 1430 are distributed on the front side of the auricle. For example, in some embodiments, the two second sound guide holes corresponding to the acoustic driver 1430 may be distributed on the same side of the pinna (eg, back, top, or bottom of the pinna). As another example, in some embodiments, two second sound guide holes corresponding to the acoustic driver 1430 may be distributed on both sides of the pinna. In some embodiments, when the sound guide hole 1411 and the sound guide hole 1412 (and/or the two second sound guide holes) are located on the same side of the pinna, the septum may be located between the sound guide hole 1411 and the sound guide hole 1412 ( and/or between the two second sound guide holes) to further increase the sound volume in the near field and reduce sound leakage in the far field. As a further example, in some embodiments, the two sound guide holes corresponding to the acoustic driver 1420 may also be located on the same side of the pinna (e.g., front side, back side, top side, or bottom side of the pinna ).

In practical application, the acoustic output device may comprise various forms of decoration such as bracelets, glasses, helmets, watches, clothes or backpacks, smart headsets, etc. In some embodiments, augmented reality technology and/or virtual reality technology may be applied to the acoustic output device to enhance the user's audio experience. For purposes of illustration, as an example, glasses with a sound output function may be provided. Exemplary glasses may be or contain augmented reality (AR) glasses, virtual reality (VR) glasses, etc.

In FIG. 42 is a longitudinal sectional view of an exemplary acoustic output device 4200 in accordance with some embodiments of the present invention. It should be noted that, without departing from the spirit and scope of the present invention, the contents described below may be applicable to an air conduction acoustic output device and a bone conduction acoustic output device.

As shown in FIG. 42, in some embodiments, the acoustic output device 4200 may include a first magnetic component 4202, a first magnetic conductive component 4204, a second magnetic conductive component 4206, a second magnetic component 4208, a vibrating plate 4205, and a voice coil 4238. One or more acoustic output device components. 4200 can form a magnetic system. For example, the magnetic system may include a first magnetic component 4202, a first magnetic conductive component 4204, a second magnetic conductive component 4206, and a second magnetic component 4208. The magnetic system may generate a first total magnetic field (or referred to as the total magnetic system magnetic field or the first magnetic field) . The first common magnetic field may be generated by all magnetic fields generated by all components of the magnetic system (eg, the first magnetic component 4202, the first magnetic conductive component 4204, the second magnetic conductive component 4206, and the second magnetic component 4208).

The magnetic component used here refers to any component that can generate a magnetic field, such as a magnet. In some embodiments, the implementation of the magnetic component may have a direction of magnetization, which refers to the direction of the magnetic field within the magnetic component. In some embodiments, the first magnetic component 4202 may include a first magnet that may generate a second magnetic field and a second magnetic component 4208 that may include a second magnet. The first magnet and the second magnet may be the same type or different types. In some embodiments, the magnet may comprise a metal alloy, ferrite, or the like magnet. The metal alloy magnet may contain materials such as neodymium-iron-boron, samarium cobalt, aluminum-cobalt-nickel, iron-cobalt-chromium, aluminum-iron-boron, iron-carbon-aluminum, and the like. or any combination of them. The ferrite may contain barium ferrite, steel ferrite, ferromanganese ferrite, lithium manganese ferrite, and the like. or any combination of them.

The magnetic conductive component may also be referred to as a magnetic field concentrator or an iron core. A magnetic conductive component can be used to form a magnetic field loop. The magnetic conductive component can correct the distribution of the magnetic field (eg, the second magnetic field generated by the first magnetic component 4202). In some embodiments, the magnetic conductive component may comprise a soft magnetic material. Exemplary soft magnetic materials may include a metal material, a metal alloy material, a metal oxide material, an amorphous metal material, and the like. For example, the soft magnetic material may include iron, iron-silicon alloy, iron-aluminum alloy, iron-nickel alloy, cobalt-iron alloy, mild steel, silicon steel sheet, silicon steel sheet, ferrite, and etc. In some embodiments, the magnetic conductive component may be manufactured by, for example, a casting process, a molding process, a cutting process, powder metallurgy, and the like. or any combination of them. Casting may include sand casting, pattern casting, pressure casting, spin casting, and the like. The forming process may include rolling, casting, forging, stamping, extrusion, drawing, and the like. or any combination of them. The cutting process may include turning, milling, planning, grinding, and the like. In some embodiments, the magnetic conductive component may be manufactured by a 3D printing process, a numerical control processing device, or the like.

In some embodiments, one or more of the first magnetic component 4202, the first magnetic conductive component 4204, and the second magnetic conductive component 4206 may have an axisymmetric structure. The axisymmetric structure may comprise a ring structure, a columnar structure, or other axisymmetric structures. For example, the structure of the first magnetic component 4202 and/or the first magnetic conductive component 4204 may be a cylinder, a cuboid, or a hollow ring (eg, the cross section of the hollow ring may have a race track). As another example, the structure of the first magnetic component 4202 and the structure of the first magnetic conductive component 4204 may be coaxial cylinders having the same diameter or different diameters. In some embodiments, the second magnetic conductive component 4206 may have a groove profile structure. The structure having a groove profile may comprise a U-shaped cross section (as shown in FIG. 42). The second groove-shaped magnetic conductive component 4206 may include a bottom plate and a side wall. In some embodiments, the bottom plate and side wall may form an integral block. For example, the side wall may be formed by extending the bottom plate in a direction perpendicular to the bottom plate. In some embodiments, the implementation of the bottom plate may be mechanically connected to the side wall. As used herein, a mechanical connection between two components may include a bonded connection, an interlocked connection, a welded connection, a riveted connection, a bolted connection, and the like. or any of their combinations.

The second magnetic component 4208 may be in the form of a ring or a sheet. For example, the second magnetic component 4208 may have an annular shape. The second magnetic component 4208 may include an inner ring and an outer ring. In some embodiments, the shape of the inner ring and/or outer ring may be a circle, ellipse, triangle, quadrilateral, or any other polygon. In some embodiments, the second magnetic component 4208 may include a plurality of magnets. The two ends of a magnet from a plurality of magnets may be mechanically connected or have a certain distance from the ends of an adjacent magnet. The distance between adjacent magnets can be the same or different. For example, the second magnetic component 4208 may include two or three sheet-like magnets that are equidistant. The sheet-like shape of the magnet may be a fan shape, a square shape, or the like. In some embodiments, the second magnetic component 4208 may be coaxial with respect to the first magnetic component 4202 and/or the first magnetic conductive component 4204.

In some embodiments, the top surface of the first magnetic component 4202 may be mechanically connected to the bottom surface of the first magnetic conductive component 4204, as shown in FIG. 42. The bottom surface of the first magnetic component 4202 may be mechanically connected to the bottom plate of the second magnetic conductive component 4206. The bottom surface of the second magnetic component 4208 may be mechanically connected to the side wall of the second magnetic conductive component 4206.

In some embodiments, a magnetic gap may be formed between the first magnetic component 4202 (and/or the first magnetic conductive component 4204) and the inner ring of the second magnetic component 4208 (and/or the second magnetic conductive component 4206). The voice coil 4238 may be located in the magnetic gap and mechanically coupled to the vibration plate 4205. The voice coil refers to an element that can transmit an audio signal. The voice coil 4238 may be located in a magnetic field generated by the first magnetic component 4202, the first magnetic conductive component 4204, the second magnetic conductive component 4206, and the second magnetic component 4208. When a current is applied to the voice coil 4238, the strength of the current generated by the magnetic field can control vibration of the voice coil 4238. The vibration of the voice coil 4238 can control the vibration plate 4205 to vibrate and form sound waves that can be transmitted to the user's ears via air conduction and/or bone conduction. In some embodiments, the distance between the bottom of the voice coil 4238 and the second magnetic conductive component 4206 may be equal to the distance between the bottom of the second magnetic component 4208 and the second magnetic conductive component 4206.

In some embodiments, for a loudspeaker device having a single magnetic component, the lines of magnetic flux through the voice coil 4238 may be uneven and divergent. Magnetic leakage may form in the magnetic system, i.e., some lines of magnetic induction may lead outside the magnetic gap and may not pass through the voice coil 4238. As a result, this may lead to a decrease in the intensity of magnetic induction (or magnetic field strength) in the voice coil 4238 and affect the sensitivity of the acoustic output device 4200. To eliminate or reduce magnetic leakage, the acoustic output device 4200 may further comprise at least one second magnetic component and/or at least one third magnetic conductive component (not shown). The at least one second magnetic component and/or the at least one third magnetic conductive component can suppress magnetic leakage and limit the shape of the magnetic flux lines passing through the voice coil 4238 so that more magnetic flux lines can pass through the voice coil 4238 horizontally and beyond. by compacting to increase the intensity of the magnetic induction (or magnetic field strength) in the voice coil 4238. The sensitivity and mechanical conversion efficiency of the acoustic output device 4200 (ie, the efficiency of converting electrical energy into mechanical vibration energy of the voice coil 4238) can be increased.

In some embodiments, the magnetic field intensity (or referred to as magnetic induction intensity or magnetic induction line density) of the first overall magnetic field in the magnetic gap may be greater than that of the second magnetic field in the magnetic gap. In some embodiments, the second magnetic component 4208 may generate a third magnetic field, and the third magnetic field may increase the magnetic field strength of the first common magnetic field in the magnetic gap. The third magnetic field increasing the intensity of the magnetic field of the first general magnetic field inside the magnetic gap, which refers to the intensity of the magnetic field of the first general magnetic field, when the third magnetic field exists (i.e., the magnetic system contains the second magnetic component 4208), is greater than when the third magnetic field does not exist (ie, the magnetic system does not include the second magnetic component 4208). As used here, unless otherwise indicated, a magnetic system refers to a system that contains all of the magnetic components and the magnetic conductive component(s). The first common magnetic field refers to the magnetic field generated by the magnetic system. Each of the second magnetic field, the third magnetic field..., and the Nth magnetic field refers to the magnetic field generated by the respective magnetic components. Different magnetic systems can unify the same magnetic component or different magnetic components to form a second magnetic field (or third magnetic field..., Nth magnetic field).

In some embodiments, the angle (denoted A1) between the direction of magnetization of the first magnetic component 4202 and the direction of magnetization of the second magnetic component 4208 may be between 0 degrees and 180 degrees. For example, the angle A1 may be between 45 degrees and 135 degrees. As another example, the angle A1 may be equal to or greater than 90 degrees. In some embodiments, the direction of magnetization of the first magnetic component 4202 may be parallel to the upward direction (as indicated by the arrow in FIG. 42), which is perpendicular to the bottom surface or the top surface of the first magnetic component 4202. The direction of magnetization of the second magnetic component 4208 may be parallel to the direction away from the inner ring. to the outer ring of the second magnetic component 4208 (as indicated by the arrow b in Fig. 42, which is to the right of the first magnetic component 4202, which can be obtained by rotating the magnetization direction of the first magnetic component 4202 90 degrees clockwise). The direction of magnetization of the second magnetic component 4208 may be perpendicular to the direction of magnetization of the first magnetic component 4202.

In some embodiments, at the position of the second magnetic component 4208, the angle (denoted as A2) between the direction of the first general magnetic field and the direction of magnetization of the second magnetic component 4208 may be no greater than 90 degrees. In some embodiments, at the position of the second magnetic component 4208, the angle (denoted as A3) between the direction of the magnetic field generated by the first magnetic component 4202 and the direction of magnetization of the second magnetic component may be less than or equal to 90 degrees, such as 0 degrees, 10 degrees, or 20 degrees. Compared to a magnet system with a single magnetic component, the second magnetic component 4208 can increase the total number of magnetic flux lines in the magnetic gap of the magnetic system of the acoustic output device 4200, thereby increasing the magnetic flux intensity in the magnetic gap. In addition, due to the second magnetic component 4208, the initially scattered magnetic lines of induction can be reduced to the position of the magnetic gap, which can further increase the intensity of magnetic induction in the magnetic gap.

In FIG. 43 is a schematic longitudinal sectional view of an exemplary magnet system 4300 in accordance with some embodiments of the present invention. As shown in FIG. 43, unlike the acoustic output device magnet system 4200, the magnet system 4300 may further comprise at least one electrical conductive component (e.g., a first electrical conductive component 4248, a second electrical conductive component 4250, and a third electrical conductive component 4252).

In some embodiments, the electrical conductive component may comprise a metallic material, a metallic alloy material, an inorganic non-metallic material, or another conductive material. An exemplary metallic material may include gold, silver, copper, aluminum, and the like. An exemplary metal alloy material may include an iron-based alloy material, an aluminum-based alloy material, a copper-based alloy material, a zinc-based alloy material, and the like. An exemplary inorganic non-metallic material may include graphite and the like. The electrical conductive component may be in the form of a sheet, a ring, a grid, or the like. The first electrical conductive component 4248 may be located on the top surface of the first magnetic conductive component 4204. The second electrical conductive component 4250 may be mechanically connected to the first magnetic component 4202 and the second magnetic conductive component 4206. The third electrical conductive component 4252 may be mechanically connected to the side wall first magnetic component 4202. In some embodiments, first magnetic conductive component 4204 may protrude from first magnetic component 4202 to form a first recess on the right side of first magnetic component 4202 as shown in FIG. 43. A third electrical conductive component 4252 may be located in the first recess. In some embodiments, the first electrical conductive component 4248, the second electrical conductive component 4250, and the third electrical conductive component 4252 may comprise the same or different conductive materials.

In some embodiments, a magnetic gap may be formed between the first magnetic component 4202, the first magnetic conductive component 4204, and the inner ring of the second magnetic component 4208. The voice coil 4238 may be located within the magnetic gap. The first magnetic component 4202, the first magnetic conductive component 4204, the second magnetic conductive component 4206, and the second magnetic component 4208 may form a magnet system 4300. In some embodiments, the electrical conductive components of the magnet system 4300 may reduce the inductive reactance of the voice coil 4238. For example, if the voice coil a first alternating current is applied to the coil 4238, a first alternating magnetic field may be generated near the voice coil 4238. Under the influence of the magnetic field of the magnet system 4300, the first alternating magnetic field may cause the voice coil 4238 to form an inductive reactance and prevent the voice coil 4238 from moving. One or more electrically conductive components (for example, the first electrically conductive component 4248, the second electrically component 4252) located near the voice coil 4238 can induce a second alternating current under the influence of the first alternating magnetic field. The second alternating current induced by the electrically conductive component(s) may form a second alternating inductive magnetic field in its vicinity. The direction of the second alternating magnetic field may be opposite to the first alternating magnetic field and the first alternating magnetic field may be weakened. The inductive reactance of the voice coil 4238 can be reduced, the current in the voice coil 4238 can be increased, and the sensitivity of the acoustic output device can be increased.

In FIG. 44 is a longitudinal sectional view of an exemplary magnet system 4400 in accordance with some embodiments of the present invention. As shown in FIG. 44, in contrast to the magnetic system of the acoustic output device 4200, the magnetic system 4400 may further comprise a third magnetic component 4410, a fourth magnetic component 4412, a fifth magnetic component 4414, a third magnetic conductive component 4416, a sixth magnetic component 4424, and a seventh magnetic component 4426. B In some embodiments, third magnetic component 4410, fourth magnetic component 4412, fifth magnetic component 4414, third magnetic conductive component 4416, sixth magnetic component 4424, and seventh magnetic component 4426 may be coaxial circular cylinders.

In some embodiments, the upper surface of the second magnetic component 4208 may be mechanically connected to the seventh magnetic component 4426, and the lower surface of the second magnetic component 4208 may be mechanically connected to the third magnetic component 4410. The third magnetic component 4410 may be mechanically connected to the second magnetic conductive component 4206. The upper surface of the seventh magnetic component 4426 may be mechanically connected to the third magnetic conductive component 4416. The fourth magnetic component 4412 may be mechanically connected to the second magnetic conductive component 4206 and the first magnetic component 4202. The sixth magnetic component 4424 may be mechanically connected to the fifth magnetic component 4414, a third magnetic conductive component 4416, and a seventh magnetic component 4426. In some embodiments, the first magnetic component 4202, the first magnetic conductive component 4204, the second magnetic A single conductive component 4206, a second magnetic component 4208, a third magnetic component 4410, a fourth magnetic component 4412, a fifth magnetic component 4414, a third magnetic conductive component 4416, a sixth magnetic component 4424, and a seventh magnetic component 4426 may form a magnetic loop and a magnetic gap.

In some embodiments, the angle (denoted A4) between the direction of magnetization of the first magnetic component 4202 and the direction of magnetization of the sixth magnetic component 4424 may be between 0 degrees and 180 degrees. For example, angle A4 may be between 45 degrees and 135 degrees. As another example, the angle A4 may not be greater than 90 degrees. In some embodiments, the direction of magnetization of the first magnetic component 4202 may be parallel to the upward direction (as indicated by the arrow in FIG. 44) that is perpendicular to the bottom surface or the top surface of the first magnetic component 4202. The direction of magnetization of the sixth magnetic component 4424 may be parallel to the direction away from the outer ring to the inner ring of the sixth magnetic component 4424 (as indicated by the arrow g in Fig. 44, which is to the right of the first magnetic component 4202 after the magnetization direction of the first magnetic component 4202 rotates 270 degrees clockwise). In some embodiments, the direction of magnetization of the sixth magnetic component 4424 may coincide with the direction of the fourth magnetic component 4412.

In some embodiments, at the position of the sixth magnetic component 4424, the angle (denoted as A5) between the direction of the magnetic field generated by the magnetic system 4400 and the direction of magnetization of the sixth magnetic component 4424 may be no greater than 90 degrees. In some embodiments, at the position of the sixth magnetic component 4424, the angle (denoted as A6) between the direction of the magnetic field generated by the first magnetic component 4202 and the direction of magnetization of the sixth magnetic component 4424 may be less than or equal to 90 degrees, such as 0 degrees, 10 degrees, or 20 degrees.

In some embodiments, the angle (denoted A7) between the direction of magnetization of the first magnetic component 4202 and the direction of magnetization of the seventh magnetic component 4426 may be between 0 degrees and 180 degrees. For example, angle A7 may be between 45 degrees and 135 degrees. As another example, the angle A7 may not be greater than 90 degrees. In some embodiments, the direction of magnetization of the first magnetic component 4202 may be parallel to the upward direction (as indicated by the arrow in FIG. 44), which is perpendicular to the bottom surface or the top surface of the first magnetic component 4202. The direction of magnetization of the seventh magnetic component 4426 may be parallel to the direction from the bottom surface up to the top surface of the seventh magnetic component 4426 (as indicated by the arrow f in Fig. 44, which is to the right of the first magnetic component 4202 after the magnetization direction of the first magnetic component 4202 rotates 360 degrees clockwise). In some embodiments, the direction of magnetization of the seventh magnetic component 4426 may be opposite to the direction of magnetization of the third magnetic component 4410.

In some embodiments, in the seventh magnetic component 4426, the angle (denoted as A8) between the direction of the magnetic field generated by the magnetic system 4400 and the magnetization direction of the seventh magnetic component 4426 may be no greater than 90 degrees. In some embodiments, at the position of the seventh magnetic component 4426, the angle (denoted as A9) between the direction of the magnetic field generated by the first magnetic component 4202 and the direction of magnetization of the seventh magnetic component 4426 may be less than or equal to 90 degrees, such as 0 degrees, 10 degrees or 20 degrees.

In the magnet system 4400, the third magnetic conductive component 4416 can close the magnetic field loops formed by the magnet system 4400 so that more lines of magnetic induction can be concentrated in the magnetic gap. This can suppress magnetic leakage, increase the magnetic induction strength in the magnetic gap, and increase the sensitivity of the acoustic output device.

In FIG. 45 is a longitudinal sectional view of an exemplary magnet system 4500 in accordance with some embodiments of the present invention. As shown in FIG. 45, the magnetic system 4500 may include a first magnetic component 4502, a first magnetic conductive component 4504, a first magnetic field variation component 4506, and a second magnetic component 4508.

In some embodiments, the top surface of the first magnetic component 4502 may be mechanically connected to the bottom surface of the first magnetic conductive component 4504. The second magnetic component 4508 may be mechanically connected to the first magnetic component 4502 and the first magnetic field variation component 4506. Two or more of the first magnetic component 4502, the first magnetic conductive component 4504, the first magnetic field variation component 4506, and/or the second magnetic component 4508 may be mechanically coupled to each other as described elsewhere in this invention (e.g., FIG. 42 and its corresponding description). In some embodiments, first magnetic component 4502, first magnetic conductive component 4504, first magnetic field variation component 4506, and/or second magnetic component 4508 may form a magnetic field loop and a magnetic gap.

In some embodiments, the implementation of the magnetic system 4500 may generate a first common magnetic field and the first magnetic component 4502 may generate a second magnetic field. The magnetic field strength of the first common magnetic field in the magnetic gap may be greater than the strength of the second magnetic field in the magnetic gap. In some embodiments, the second magnetic component 4508 may generate a third magnetic field, and the third magnetic field may increase the magnetic field strength of the second magnetic field in the magnetic gap.

In some embodiments, the angle (denoted as A10) between the direction of magnetization of the first magnetic component 4502 and the direction of magnetization of the second magnetic component 4508 may be between 0 degrees and 180 degrees. For example, angle A10 may be between 45 degrees and 135 degrees. As another example, the angle A10 may not be greater than 90 degrees.

In some embodiments, at the position of the second magnetic component 4508, the angle (denoted as A11) between the direction of the first general magnetic field and the direction of magnetization of the second magnetic component 4508 may be no greater than 90 degrees. In some embodiments, at the position of the second magnetic component 4508, the angle (denoted as A12) between the direction of the second magnetic field generated by the first magnetic component 4502 and the direction of magnetization of the second magnetic component 4508 may be less than or equal to 90 degrees, such as 0 degrees, 10 degrees and 20 degrees. In some embodiments, the direction of magnetization of the first magnetic component 4502 may be parallel to the upward direction (as indicated by the arrow in FIG. 45), which is perpendicular to the bottom surface or the top surface of the first magnetic component 4502. The direction of magnetization of the second magnetic component 4508 may be parallel to the direction away from the outer ring. to the inner ring of the second magnetic component 4508 (as indicated by arrow c in Fig. 45, which is to the right of the first magnetic component 4502 after the magnetization direction of the first magnetic component 4502 is rotated 90 degrees clockwise). Compared to a magnet system with a single magnetic component, the first magnetic field change component 4506 in the magnet system 4500 can increase the total number of magnetic flux lines in the magnetic gap, thereby increasing the magnetic flux density in the magnetic gap. Furthermore, due to the first magnetic field change component 4506, the initially scattered magnetic field lines can converge to the position of the magnetic gap, which can further increase the magnetic field strength in the magnetic gap.

In FIG. 46 is a longitudinal sectional view of an exemplary magnet system 4600 in accordance with some embodiments of the present invention. As shown in FIG. 46, in some embodiments, the magnet system 4600 may include a first magnetic component 4502, a first magnetic conductive component 4504, a first magnetic field variation component 4506, a second magnetic component 4508, a third magnetic component 4610, a fourth magnetic component 4612, a fifth magnetic component 4616, a sixth magnetic component 4618, a seventh magnetic component 4620, and a second annular component 4622. In some embodiments, the first magnetic field variation component 4506 and/or the second annular component 4622 may comprise an annular magnetic component or an annular magnetic conductive component.

The annular magnetic component may comprise any one or more of the magnetic materials as described elsewhere in this invention (eg, FIG. 42 and its corresponding description). The annular magnetic conductive component may comprise any one or more of the magnetically conductive materials described herein (eg, FIG. 42 and its corresponding description).

In some embodiments, the sixth magnetic component 4618 may be mechanically coupled to the fifth magnetic component 4616 and the second annular component 4622. The seventh magnetic component 4620 may be mechanically coupled to the third magnetic component 4610 and the second annular component 4622. In some embodiments, one or more of the first magnetic component 4502, the fifth magnetic component 4616, the second magnetic component 4508, the third magnetic component 4610, the fourth magnetic component 4612, the sixth magnetic component 4618, the seventh magnetic component 4620, the first magnetic conductive component 4504, the first magnetic field change component 4506, and the second ring component 4622 can form a magnetic field loop.

In some embodiments, the angle (denoted as A13) between the direction of magnetization of the first magnetic component 4502 and the direction of magnetization of the sixth magnetic component 4618 may be between 0 degrees and 180 degrees. For example, angle A13 may be between 45 degrees and 135 degrees. As another example, angle A13 can be no greater than 90 degrees. In some embodiments, the direction of magnetization of the first magnetic component 4502 may be parallel to the upward direction (as indicated by arrow a in Fig. 46), which is perpendicular to the lower surface or the upper surface of the first magnetic component 4502. The direction of magnetization of the sixth magnetic component 4618 may be parallel to the direction from the outer ring to the inner ring of the sixth magnetic component 4618 (as indicated by the arrow f in Fig. 46, which is to the right of the first magnetic component 4502 after the direction of magnetization of the first magnetic component 4202 rotates 270 degrees clockwise). In some embodiments, the direction of magnetization of the sixth magnetic component 4618 may coincide with the direction of the second magnetic component 4508. The direction of magnetization of the seventh magnetic component 4620 may be parallel to the direction from the bottom surface to the top surface of the seventh magnetic component 4620 (as indicated by arrow e in Fig. 46, which is to the right of the first magnetic component 4502 after the magnetization direction of the first magnetic component 4502 is rotated 90 degrees clockwise). In some embodiments, the direction of magnetization of the seventh magnetic component 4620 may coincide with the direction of the fourth magnetic component 4612.

In some embodiments, at the position of the sixth magnetic component 4618, the angle (denoted as A14) between the direction of the magnetic field generated by the magnetic system 4600 and the direction of magnetization of the sixth magnetic component 4618 may be no greater than 90 degrees. In some embodiments, at the position of the sixth magnetic component 4618, the angle (denoted as A15) between the direction of the magnetic field generated by the first magnetic component 4502 and the direction of magnetization of the sixth magnetic component 4618 may be less than or equal to 90 degrees, such as 0 degrees, 10 degrees and 20 degrees.

In some embodiments, the angle (denoted A16) between the direction of magnetization of the first magnetic component 4502 and the direction of magnetization of the seventh magnetic component 4620 may be between 0 degrees and 180 degrees. For example, angle A16 may be between 45 degrees and 135 degrees. As another example, the angle A16 may not be greater than 90 degrees.

In some embodiments, at the position of the seventh magnetic component 4620, the angle (denoted as A17) between the direction of the magnetic field generated by the magnetic system 4600 and the direction of magnetization of the seventh magnetic component 4620 may be no greater than 90 degrees. In some embodiments, at the position of the seventh magnetic component 4620, the angle (denoted as A18) between the direction of the magnetic field generated by the first magnetic component 4502 and the direction of magnetization of the seventh magnetic component 4620 may be less than or equal to 90 degrees, such as 0 degrees, 10 degrees, and 20 degrees.

In some embodiments, the first magnetic field change component 4506 may be an annular magnetic component. The direction of magnetization of the first component 4506 of the magnetic field change may coincide with the direction of the second magnetic component 4508 or the fourth magnetic component 4612. For example, on the right side of the first magnetic component 4502, the direction of magnetization of the first component 4506 of the magnetic field may be parallel to the direction from the outer ring to the inner ring the first component 4506 changes in the magnetic field. In some embodiments, the second annular component 4622 may be an annular magnetic component. The direction of magnetization of the second annular component 4622 may be the direction of the sixth magnetic component 4618 or the seventh magnetic component 4620. For example, on the right side of the first magnetic component 4502, the direction of magnetization of the second annular component 4622 may be parallel to the direction from the outer ring to the inner ring of the second annular component 4622. In the magnetic system 4600, a plurality of magnetic components can increase the total number of magnetic lines, and various magnetic components can interact, which can suppress leakage of magnetic lines, increase the magnetic field strength in the magnetic gap, and improve the sensitivity of the acoustic output device.

In some embodiments, the implementation of the magnetic system 4600 may further include a magnetic conductive casing. The magnetic conductive housing may comprise one or more of the magnetic conductive materials (eg, mild steel, silicon steel sheet, silicon steel sheet, ferrite, etc.) described in the present invention. For example, the magnetic conductive housing may be mechanically connected to the first magnetic component 4502, the first magnetic field variation component 4506, the second magnetic component 4508, the third magnetic component 4610, the fourth magnetic component 4612, the fifth magnetic component 4616, the sixth magnetic component 4618, the seventh magnetic component 4620 and the second annular 4622 component. In some embodiments, the implementation of the magnetic conductive casing may include at least one bottom plate and a side wall. The side wall may have an annular structure. At least one bottom plate and side wall may form an integral block. Alternatively, at least one bottom plate may be mechanically connected to the side wall by one or more mechanical connections, as described elsewhere in the present invention. For example, the magnetic conductive casing may include a first base plate, a second base plate, and a side wall. The first bottom plate and the side wall may form an integral unit, and the second bottom plate may be mechanically connected to the side wall through one or more of the mechanical connections described elsewhere in the present invention.

In the magnetic system 4500, the magnetic conductive casing can close the loops of the magnetic field generated by the magnetic system 4500 so that more magnetic field lines can be concentrated in the magnetic gap in the magnetic system 4500. This can suppress magnetic leakage, increase the magnetic field strength in the magnetic gap, and increase sensitivity of the acoustic output device.

In some embodiments, the magnet system 4500 may further comprise one or more electrically conductive components (eg, a first electrically conductive component, a second electrically conductive component, and a third electrically conductive component). The one or more electrical conductive components may be like the first electrical conductive component 4248, the second electrical conductive component 4250, and the third electrical conductive component 4252, as described in conjunction with FIG. 43.

In FIG. 47 is a longitudinal sectional view of an exemplary magnet system 4700 in accordance with some embodiments of the present invention. As shown in FIG. 47, the magnet system 4700 may include a first magnetic component 4702, a first magnetic conductive component 4704, a second magnetic conductive component 4706, and a second magnetic component 4708.

In some embodiments, the implementation of the first magnetic component 4702 and/or the second magnetic component 4708 may contain one or more magnets described in the present invention. In some embodiments, the first magnetic component 4702 may include a first magnet and the second magnetic component 4708 may include a second magnet. The first magnet and the second magnet may be the same or different. The first magnetic conductive component 4704 and/or the second magnetic conductive component 4706 may comprise one or more of the magnetic conductive materials described in the present invention. The first magnetic conductive component 4704 and/or the second magnetic conductive component 4706 may be manufactured by one or more of the processing methods described in the present invention. In some embodiments, the first magnetic component 4702, the first magnetic conductive component 4704, and/or the second magnetic component 4708 may have an axisymmetric structure. For example, each of the first magnetic component 4702, the first magnetic conductive component 4704, and/or the second magnetic component 4708 may be a cylinder. In some embodiments, the first magnetic component 4702, the first magnetic conductive component 4704, and/or the second magnetic component 4708 may be coaxial cylinders having the same or different diameters. The thickness of the first magnetic component 4702 may be greater than or equal to the thickness of the second magnetic component 4708. In some embodiments, the implementation of the second magnetic conductive component 4706 may have a groove-shaped structure. In some embodiments, the groove-shaped structure may have a U-shaped section. The second groove-shaped magnetic conductive component 4706 may include a bottom plate and a side wall. In some embodiments, the bottom plate and side wall may form an integral unit. For example, the side wall may be in the form of an extension of the bottom plate in a direction perpendicular to the bottom plate. In some embodiments, the implementation of the bottom plate can be mechanically connected to the side wall through a mechanical connection, as described elsewhere in the present invention (for example, Fig. 42 and the corresponding description). The second magnetic component 4708 may be in the form of a ring or a sheet. The shape of the second magnetic component 4708 may be similar to the shape of the second magnetic component 4208 as described in connection with FIG. 43. In some embodiments, the second magnetic component 4708 may be coaxial with the first magnetic component 4702 and/or with the first magnetic conductive component 4704.

In some embodiments, the top surface of the first magnetic component 4702 may be mechanically connected to the bottom surface of the first magnetic conductive component 4704. The bottom surface of the first magnetic component 4702 may be mechanically connected to the bottom plate of the second magnetic conductive component 4706. The bottom surface of the second magnetic component 4708 may be mechanically connected to the top surface of the first magnetic conductive component 4704. Two or more of the first magnetic component 4702, the first magnetic conductive component 4704, the second magnetic conductive component 4706 and/or the second magnetic component 4708 may be connected to each other by mechanical connection, as described in elsewhere in the present invention (eg, FIG. 20 and related description).

In some embodiments, a magnetic gap may be formed between the first magnetic component 4702, the first magnetic conductive component 4704, the second magnetic component 4708, and the side wall of the second magnetic conductive component 4706. The voice coil 4720 may be located within the magnetic gap. In some embodiments, first magnetic component 4702, first magnetic conductive component 4704, second magnetic conductive component 4706, and second magnetic component 4708 may form a magnetic field loop. In some embodiments, the implementation of the magnetic system 4700 may generate a first common magnetic field and the first magnetic component 4702 may generate a second magnetic field. The first common magnetic field may be generated by all magnetic fields generated by all components of the magnetic system 4700 (eg, first magnetic component 4702, first magnetic conductive component 4704, second magnetic conductive component 4706, and second magnetic component 4708). The magnetic field intensity (or called magnetic induction strength or magnetic induction line density) in the magnetic gap of the first common magnetic field may be greater than the magnetic field intensity in the magnetic gap of the second magnetic field. In some embodiments, the second magnetic component 4708 may generate a third magnetic field, and the third magnetic field may increase the intensity of the magnetic field of the second magnetic field in the magnetic gap.

In some embodiments, the angle (denoted as A19) between the direction of magnetization of the second magnetic component 4708 and the direction of magnetization of the first magnetic component 4702 may be between 90 degrees and 180 degrees. For example, angle A10 may be between 150 degrees and 180 degrees. Just by way of example, the direction of magnetization of the second magnetic component 4708 (as indicated by arrow b in Fig. 47) may be opposite to the direction of magnetization of the first magnetic component 4702 (as indicated by arrow a in Fig. 47).

Compared to a magnet system with a single magnetic component, the magnet system 4700 includes a second magnetic component 4708. The second magnetic component 4708 may have a magnetization direction opposite to the magnetization direction of the first magnetic component 4702, which can suppress magnetic leakage of the first magnetic component 4702 in its magnetization direction, so that more magnetic flux lines formed by the first magnetic component 4702 can be concentrated in the magnetic gap, thereby increasing the magnetic flux intensity in the magnetic gap.

It should be noted that the above description with respect to magnetic systems is provided merely for purposes of illustration and is not intended to limit the protection scope of the present invention. Numerous changes and modifications can be made by those skilled in the art based on the principles of the present invention. However, these changes and modifications do not depart from the protection scope of the present invention. In some embodiments, the magnetic system may include one or more additional components and/or one or more of the acoustic output device components may be omitted. Additionally or alternatively, two or more magnet system components may be integrated into a single component. The magnet system component may be implemented on two or more sub-components.

In FIG. 48 is an exploded perspective view of an acoustic output device in accordance with some embodiments of the present invention. In FIG. 49 is a cross-sectional view of a portion of the acoustic output device shown in FIG. 48 corresponding to some embodiments of the present invention. As shown in FIG. 48 and FIG. 49, the acoustic output device may include a magnetic connector 55. The magnetic connector 55 may be used in conjunction with an external power charging interface to charge the acoustic output device. For example, when charging an acoustic output device, the magnetic connector 55 and the charging interface from an external power source may correspond to each other and be connected to each other to establish an electrical connection to charge the acoustic output device. In some embodiments, the magnetic connector 55 may include a magnetic adsorption ring 551, an insulating base 552, and a plurality of leads (eg, a first lead 553 and a second lead 554).

The magnetic adsorption ring 551 may be a magnet, and the polarity of the magnet at the outer end and the inner end may be different. As used herein, the outer end of an acoustic output device component refers to the end closer to the external environment of the acoustic output device (e.g., originating from the acoustic output device), and the inner end of the component refers to the end that is away from the external environment of the acoustic output device (e.g., , located inside the acoustic output device). The external power charge interface may have a magnetic adsorption structure that corresponds to the magnetic adsorption ring 551. The magnetic adsorption structure may contain one or more magnetic materials. For example, the magnetic adsorption structure may contain iron and/or one or more other non-polarity materials that can be adsorbed with the magnetic adsorption ring 551 regardless of whether the outer end of the magnetic adsorption ring 551 is the south pole or the north pole. As another example, the magnetic adsorption structure may also contain a magnet and/or one or more other polarity materials. The magnetic adsorption ring 551 and the magnetic adsorption structure can be adsorbed together only when the magnetic polarity of the outer end of the magnetic adsorption structure and the magnetic polarity of the outer end of the magnetic adsorption ring 551 are opposite. When the magnetic connector 55 and the external power charge interface c are connected to each other, the terminal of the magnetic connector 55 can be contacted with the corresponding terminal of the external power charge interface, and an electrical connection can be established between the magnetic connector 55 and the external power charge interface.

The outer end of the magnetic adsorption ring 551 may have any suitable shape. For example, the outer end of the magnetic adsorption ring 551 may have an annular shape. The magnetic adsorption ring 551 and the magnetic adsorption structure and external power charge interface can be connected together through an annular outer end. Due to the hollow structure of the annular outer end, the magnetic adsorption ring 551 can be connected to the charge interface from an external power supply by magnetic forces in various directions. This can improve the stability of the electrical connection between the magnetic adsorption ring 551 and the external power charge interface.

In FIG. 50 is a partially enlarged view of portion A of the magnetic connector 55 shown in FIG. 49 corresponding to some embodiments of the present invention. In some embodiments, at least a portion of the insulating base 552 may be inserted into the magnetic adsorption ring 551 to secure the magnetic adsorption ring 551. The insulating base 552 may include at least two mounting holes 5521. At least two mounting holes 5521 may be inserted to the outer end of the insulating base 552. In some embodiments, the implementation of the insulating base 552 may contain one or more insulating materials, such as polycarbonate or PVC.

The terminal of the magnetic connector 55 may be of any suitable shape. For example, the first terminal 553 and the second terminal 554 may both be cylindrical. The number of leads may be equal to the number of mounting holes 5521. Each of the leads may be inserted into one of the mounting holes 5521. direction facing the top surface of the insulating base 552. Additionally, the outer end of the lead of the magnetic connector 55 may be flush with the top surface of the insulating base 552 to form a contact surface. For example, as shown in FIG. 50, the first terminal 553 may form the first contact surface 5531, and the second terminal 554 may form the second contact surface 5541. The first terminal 553 and the second terminal 554 may correspond to the positive and negative terminals of the external power charge interface, respectively. Accordingly, the first contact surface 5531 and the second contact surface 5541 may contact the charge interface from an external power source to establish an electrical connection.

In some embodiments, when the magnetic connector 55 and the external power charge interface are connected to each other, the magnetic connector 55 may be constrained by magnetic forces from various directions applied by the hollow, annular-shaped magnetic adsorption ring 551. The first contact surface 5531 and the second contact surface 5541 can be accurately positioned and contacted with an external power charge interface to establish an electrical connection. This can improve the stability and accuracy of the electrical connection between the magnetic adsorption ring 551 and the external power charge interface.

In some embodiments, the insulating base 552 may include a support element 5522 and an insert element 5523. The support member 5522 and the insert member 5523 may be arranged along a direction parallel to the axis of the mounting hole 5521. The cross section of the support member 5522 may be larger than that of the insert member 5523, thus forming a reference plane 55221 on the support member 5522, as shown in fig. fifty.

The outer side wall of the side of the insert member 5523 may correspond to the inner side wall of the side of the magnetic adsorption ring 551, so that the insert member 5523 can be inserted into the magnetic adsorption ring 551 to fix the magnetic adsorption ring 551. The mounting hole 5521 of the insulating base 552 may pass through the insert member 5523 and support member 5522 so that a lead placed in the mounting hole 5521 can pass through the entire insulating base 552. For example, the first lead 553 may extend through the entire insulating base 552. The first end of the first lead 553 may protrude from the outer end of the insert member 5523 to form a first contact surface 5531. The second end of the first terminal 553 may protrude from the inner end of the support member 5522 for connection to the internal circuit. Similarly, the second lead 554 may extend through the entire insulating base 552. The first end of the second lead 554 may protrude from the outer end of the insert member 5523 to form a second contact surface 5541. scheme.

In some embodiments, the insert member 5523 may be inserted into the magnetic adsorption ring 551 and the inner end of the magnetic adsorption ring 551 may be supported by the support plane 55221. The size of the magnetic adsorption ring 551 may correspond to the support member 5522.

In some embodiments, the magnetic connector 55 may further comprise a housing 555. The housing 555 may be pulled over the insulating base 552 and the magnetic adsorption ring 551 so that the magnetic connector 55 may be integrally assembled at the charge interface from an external power source of the acoustic output device. The housing 555 may be made from one or more non-magnetic metallic materials (eg, copper, aluminum, and/or aluminum alloy), plastic, and the like, or any combination thereof.

The housing 555 may include a body 5551 and a flange 5552 located at the outer end of the body 5551. The outer end of the body 555 may be partially open due to the flange 5552 and the inner end of the body 555 may be completely open. The inner surface of the main body 5551 may correspond to the outer surface of the magnetic adsorption ring 551 and the support member 5522 of the insulating base 552. The flange 5552 may cover the outer end of the magnetic adsorption ring 551. establishing an electrical connection to the charge interface from an external power source.

In some embodiments, the outer end of the insertion element 5523 of the insulating base 552 may protrude from the end of the magnetic adsorption ring 551 away from the support element 5522, as shown in FIG. 50. The shape of the partially open end formed by the flange 5552 may match the shape of the periphery of the insert member 5523 such that an end of the insert member 5523 directed away from the support member 5522 may pass through the partially open end of the housing 555 to the outside of the housing 555.

In some alternative embodiments, the outer end of the insert element 5523 of the insulating base 552 may be recessed relative to the outer end of the flange 5552.

In some embodiments, the outer peripheral wall of the support member 5522 and the inner peripheral wall of the body 5551 may be mechanically connected to each other via a fastener connection. The clasp connection can improve the stability of the mechanical connection between the body 555, the insulating base 552, and the magnetic adsorption ring 551, thereby improving the stability of the magnetic connector 55.

In some embodiments, two through grooves 55511 may be located on two opposite surfaces of the outer peripheral wall of the main body 5551, respectively. Support member 5522 may include two fasteners 55222 corresponding to two through grooves 55511. Body 555 may slide over support member 5522 of insulating base 552 using fastener connections between through grooves 55511 and fasteners 55222.

In some embodiments, the outer end of the magnetic adsorption ring 551 may be rotationally symmetrical about a predetermined point of symmetry (otherwise referred to as a center of rotation). When the magnetic adsorption ring 551 rotates, the first contact surface 5531 and the second contact surface 5541 can rotate together with the magnetic adsorption ring 551. The first contact surface 5531 and the second contact surface 5541 may at least partially overlap the first contact surface 5531 and the second before rotation. contact surface 5541 after rotation. That is, the surface formed by the first contact surface 5531 and the second contact surface 5541 may be rotationally symmetrical about or close to the same predetermined symmetry point. The shape of the outer end of the magnetic adsorption ring 551 and the rotational symmetry angle can be determined based on the arrangement of the first contact surface 5531 and the second contact surface 5541. For example, the outer end of the magnetic adsorption ring 551 may be shaped like a circular ring, an elliptical ring, a rectangular ring, etc. .

Due to the rotationally symmetrical shape of the outer end of the magnetic adsorption ring 551, the magnetic adsorption ring 551 after symmetrical rotation can move back to its original position. The magnetic adsorption ring 551 may have at least two assembly positions with respect to the first contact surface 5531 and the second contact surface 5541, and the magnetic connector 55 and the external power supply interface for establishing an electrical connection may be attracted to each other at a plurality of rotation angles.

In some embodiments, as shown in FIG. 51, the outer end of the magnetic adsorption ring 551 may be in the form of a circular ring with the center as a point of symmetry. The first contact surface 5531 and the second contact surface 5541 may respectively be in the form of a circle or an annular ring concentric with the magnetic adsorption ring 551. surface 5541 before rotation may completely overlap the first contact surface 5531 and the second contact surface 5541 after rotation. When the magnetic adsorption ring 551 captures the corresponding magnetic adsorption structure of the external power charge interface, the first contact surface 5531 and the second contact surface 5541 can correspond to the positive terminal and negative terminal of the external power charge interface, respectively, and the magnetic connector 55 and the external power charge interface external power supply can capture each other without additional calibration, which is convenient for users.

In some embodiments, as shown in FIG. 52, the number of first contact surfaces 5531 may be one, and the number of second contact surfaces 5541 may be one. The first contact surface 5531 and the second contact surface 5541 may be arranged in a 180 degree rotationally symmetrical shape with respect to the point of symmetry. When the magnetic adsorption ring 551 rotates 180 degrees, the first contact surface 5531 after rotation can completely cover the second contact surface 5541 before rotation, and the second contact surface 5541 after rotation can completely cover the first contact surface 5531 before rotation. The first contact surface 5531 and the second contact surface 5541 may be adjacent to and in correspondence with the positive terminal and the negative terminal of the external power charge interface, respectively. The outer end of the magnetic adsorption ring 551 may have a 180 degree rotationally symmetrical shape with respect to the point of symmetry.

As shown in FIG. 53, the outer end of the magnetic adsorption ring 551 may have a 180-degree rotationally symmetrical shape with respect to the symmetry point. When the magnetic adsorption ring 551 rotates 180 degrees, the first contact surface 5531 and the second contact surface 5541 before rotation can at least partially overlap the first contact surface 5531 and the second contact surface 5541 after rotation, respectively. The size of the magnetic adsorption ring 551 in the first direction may be different from the size in the second direction perpendicular to the first direction. For example, the outer end of the magnetic adsorption ring 551 may be in the form of an elliptical ring, a rectangular ring, or the like.

In some embodiments, the size of the magnetic adsorption ring 551 in the first direction may be larger than in the second direction. The number of first contact surfaces 5531 may be one, and the first contact surface 5531 may be located at a point of symmetry of the magnetic adsorption ring 551. The number of second contact surfaces 5541 may be two, and the two second contact surfaces 5541 may be equidistant on either side of the point of symmetry. magnetic adsorption ring 551 in the first direction. When the magnetic adsorption ring 551 rotates 180 degrees, the two second contact surfaces 5541 can change positions with each other. The shape of the first contact surface 5531 may be the same as or different from the shape of the second contact surface 5541. The shapes of the two second contact surfaces 5541 may be the same. For example, the first contact surface 5531 and the second contact surface 5541 may both have a circular shape or another shape that can completely overlap when rotated 180 degrees about a point of symmetry.

When the magnetic adsorption ring 551 rotates 180 degrees, the magnetic adsorption ring 551 can be in two opposite directions, and the first contact surface 5531 and the second contact surface(s) 5541 can at least partially overlap each other after the 180 degree rotation. In such cases, the magnetic adsorption ring 551 may have two assembly positions. In each of the two assembly positions, the magnetic adsorption ring 551 can slide over the insertion member 5523 of the insulating base 552, which is provided with the first terminal 553 and the second terminal 554, and the magnetic connector 55 and the external power charge interface may engage each other to establish an electrical connection.

In some embodiments, the implementation of the magnetic adsorption ring 551 may be divided into at least two annular sections 5511 in a circular direction. The outer ends of adjacent annular sections 5511 may have different magnetic polarities. The division of the annular section 5511 may be performed in accordance with a certain rule. For example, if the outer end of the magnetic adsorption ring 551 has an annular shape, the magnetic adsorption ring 551 can be divided into equal parts along its radial direction. Just for example, the magnetic adsorption ring 551 can be divided into four annular sections 5511 of the same shape. As another example, the magnetic adsorption ring 551 may be randomly divided. As another example, if the outer end of the magnetic adsorption ring 551 is in the shape of a regular symmetrical ring such as an oval ring, a circular ring, or a rectangular ring, the magnetic adsorption ring 551 can be divided into two or more identical annular sections 5511 along at least one axis of symmetry. magnetic adsorption ring 551. If the outer end of the magnetic adsorption ring 551 is in the shape of an irregular ring, the magnetic adsorption ring 551 can be divided into two or more asymmetric ring sections 5511.

The magnetic polarity of the outer end of each annular section 5511 may be determined in accordance with the connection between the contact surface(s) (for example, the first contact surface 5531 and/or the second contact surface 5541) and the external power charge interface terminal(s). The connection between the contact surface(s) (eg, the first contact surface 5531 and/or the second contact surface 5541) and the terminal(s) of the external power charge interface may comprise a correct connection and an incorrect connection. As used herein, proper connection refers to a connection in which the contact surface(s) (for example, the first contact surface 5531 and/or the second contact surface 5541) can be connected to the output(s) of the interface charge from an external power source and magnetic the polarity of the outer end of each annular section 5511 may be opposite to the polarity of the outer end of the corresponding magnetic adsorption interface structure of the charge from an external power source. Incorrect connection refers to a connection in which the contact surface(s) (for example, the first contact surface 5531 and/or the second contact surface 5541) cannot come into connection with the external power charge interface terminal(s) because the magnetic the polarity of the outer end of each annular section 5511 may match the polarity of the outer end of the corresponding magnetic adsorption interface structure of the charge from an external power source. Proper connection can establish an electrical connection between the magnetic connector 55 and the external power charging interface to charge the acoustic output device. Incorrect connection cannot establish an electrical connection between the magnetic connector 55 and the charge interface from an external power source to charge the acoustic output device.

In some embodiments, the size of the magnetic adsorption ring 551 in the first direction may be different from the size in the second direction perpendicular to the first direction. For example, the size of the magnetic adsorption ring 551 in the first direction may be larger than the size in the second direction. Just for example, the outer end of the magnetic adsorption ring 551 may be in the form of an elliptical ring. In some embodiments, the implementation of the magnetic adsorption ring 551 may be divided into two annular sections 5511 located side by side along the axis of symmetry of the elliptical ring in the first direction or the second direction. The magnetic polarity of the outer end of one annular section 5511 may be a north pole (N) and the magnetic polarity of the outer end of the other annular section 5511 may be a south pole (S). In some embodiments, the first contact surface 5531 and the second contact surface 5541 may be located on a 180 degree rotationally symmetrical shape with respect to the point of symmetry.

The shape and number of the magnetic adsorption structures of the external charge interface may be the same as the shape of the magnetic adsorption ring 551 of the magnetic connector 55. 551. If the connection between the contact surface(s) (for example, the first contact surface 5531 and/or the second contact surface 5541) and the output(s) of the charge interface from an external power source is the correct connection, the annular section 5511 of the magnetic adsorption ring 551 may be captured by the corresponding magnetic adsorption interface structure charge from an external power source to establish an electrical connection and charge the acoustic output device. If the connection between the contact surface(s) (for example, the first contact surface 5531 and/or the second contact surface 5541) and the terminal(s) of the charge interface from an external power source is an incorrect connection, the annular section 5511 of the magnetic adsorption ring 551 cannot be captured the corresponding magnetic adsorption structure of the charge interface from an external power supply. This makes it possible to avoid misconnection between the magnetic connector 55 and the external power charging interface, and is convenient for users.

The present invention may also provide a magnetic connector component comprising two magnetic connectors 55 as described in the present invention. For example, the magnetic connector component may include a magnetic connector 55a and a magnetic connector 55b. The shape and number of the annular sections 5511 of the magnetic adsorption ring 551 of the magnetic connector 55a may be the same as the shape and number of the annular sections 5511 of the magnetic adsorption ring 551 of the magnetic connector 55b. The magnetic polarity of the annular section(s) 5511 of the magnetic adsorption ring 551 of the magnetic connector 55a may be opposite to the magnetic connector 55b. When the magnetic connectors 55a and 55b are connected to each other, the contact surface(s) of the magnetic connector 55a may come into contact with the contact surface(s) of the magnetic connector 55b. The connection between the magnetic connector 55a and the magnetic connector 55b may be the same or similar to the connection between the magnetic connector 55 and the external power charge interface as described with respect to FIG. 51-53. For example, when the first contact surface 5531 and the second contact surface 5541 of the magnetic connector 55a come into contact with the first contact surface 5531 and the second contact surface 5541 of the magnetic connector 55b, the magnetic connector 55a and the magnetic connector 55b can be connected together to establish a correct connection if they are the annular sections have opposite magnetic polarities. When the first contact surface 5531 and the second contact surface 5541 of the magnetic connector 55a contacts the first contact surface 5531 and the second contact surface 5541 of the magnetic connector 55b, the magnetic connector 55a and the magnetic connector 55b cannot be connected together if their annular sections have the same magnetic polarity. This can help avoid misconnection between the magnetic connector 55a and the magnetic connector 55b, and is convenient for users.

In some embodiments, as shown in FIG. 48 and FIG. 49, the magnetic connector 55 may be mounted in the circuit case 10. Circuit body 10 may include two main side walls 11 spaced apart from each other and at least one end wall 13. The inner surface of at least one main side wall 11 may include two interlocking walls 19 spaced apart from each other. . The two blocking walls 19 may be arranged parallel to the end wall 13 of the circuit housing 10. Two main side walls 11 and two interlock walls 19 may form a placement space near the second side wall 12, and a magnetic connector 55 may be located in the placement space.

In some embodiments, each of the two main sidewalls 11 may further comprise a mounting hole 113. The acoustic output device may further comprise two locking components 56. Two locking components 56 may be inserted into the mounting holes 113 of the two main sidewalls 11, respectively, and secured magnetic connector 55. The number of mounting holes 113 and the number of fixing components 56 may be the same. Just by way of example, the locking component 56 may be a screw. The end of the screw may pass through the mounting hole 113 in the main side wall 11 to abut the outer side wall of the magnetic connector 55, and the other end of the screw may be fixed in the mounting hole 113.

In some embodiments, each of the opposite sides of the magnetic connector 55 may include two mounting holes 55512 for receiving the locking components 56. The magnetic connector 55 may have a 180 degree rotationally symmetrical structure with respect to an axis of symmetry parallel to the direction of the magnetic connector 55 along which it is inserted into space. to accommodate. After the magnetic connector 55 is inserted into the accommodating space, at least one of these two mounting holes, 55512 on each of opposite sides of the magnetic connector 55 may be flush with the mounting hole 113. The mounting hole 113 may be configured to mounting the outer end of the locking component 56 therein. The mounting hole 55512 may be configured to receive the inner end of the locking component 56. The two ends of the locking component 56 can pass through the mounting hole 113 and the mounting hole 55512, respectively, to fix the magnetic connector placement space. In some embodiments, the magnetic connector 55 may have a 180 degree rotationally symmetrical shape and include two mounting holes 55512 in its side surface, as shown in FIG. 48 and two mounting holes 55512 on the surface opposite the side surface. Thus, there are two mounting holes corresponding to the mounting holes 113, whether the magnetic connector 55 is rotated or not, which can make it easier to mount the magnetic connector 55.

The first housing shield 21 and/or the second housing shield 31 may cover the mounting hole(s) 113 in the main side wall 11. The first housing shield 21 and/or the second housing shield 31 may include a viewing hole 57 to view the magnetic connector 55, which may simplify the use of an acoustic output device.

It should be noted that the above description of the acoustic output device is merely for purposes of illustration and is not intended to limit the scope of the present invention. Various changes and modifications can be made by those skilled in the art in accordance with the principle of the present invention. However, these variations and modifications should not depart from the protection scope of the present invention. In some embodiments, the acoustic output device may include one or more additional components and/or one or more of the acoustic output device components described above may be omitted. Additionally or alternatively, two or more acoustic output device components may be integrated into a single component. The acoustic output device component may be implemented in two or more sub-components.

Claims (33)

1. Acoustic output device, containing: acoustic output component; and a support structure for supporting the acoustic output component near the user's ear, the support structure forming an acoustically open structure to allow the acoustic output component to acoustically communicate with the environment, wherein acoustic output component contains a plurality of acoustic drivers, each of which is configured to output sound in the frequency range, and the frequency ranges of sounds output by different acoustic drivers are different, wherein said set of acoustic drivers contains the first acoustic driver, configured to output the first sounds with the first frequency range; and a second acoustic driver configured to output second sounds with a second frequency range, wherein the second frequency range contains higher frequencies than the first frequency range, and at least one of the plurality of acoustic drivers comprises magnetic system for generating the first magnetic field, while the magnetic system contains a first magnetic component for generating a second magnetic field; and at least one second magnetic component surrounding the first magnetic component, wherein a magnetic gap is formed between the first magnetic component and said at least one second magnetic component, and the intensity of the first magnetic field in the magnetic gap is greater than the intensity of the second magnetic field in the magnetic gap , and support structure contains a plurality of first sonic guide holes comprising a pair of first sonic guide holes that are at a first distance from each other, wherein the pair of first sonic guide holes is configured to output said first sounds with opposite phases, and a plurality of second sound guide holes containing a pair of second sound guide holes that are at a second distance from each other, the first distance being greater than the second distance, and the pair of second sound guide holes are configured to output said second sounds with opposite phases. 2. The acoustic output device of claim 1, wherein the support structure comprises a behind-the-ear holder for hanging the acoustic output component from the user's ear, or a headband placed on the user's head when the user is wearing the acoustic output device. 3. Acoustic output device according to claim 1, in which the supporting structure includes a fixing component configured to fix the acoustic output component near the opening of the user's external auditory canal, and the fixing component is configured to be placed in the external auditory canal without blocking the external auditory canal. 4. Acoustic output device according to claim 1, also containing a first acoustic path between the first acoustic driver and said plurality of first audio guide holes, and a second acoustic path between the second acoustic driver and said plurality of second acoustic guide holes, wherein the first acoustic path and the second acoustic path have different frequency selection characteristics. 5. Acoustic output device according to claim 1, in which the supporting structure contains the first housing for accommodating the first acoustic driver and the second housing for accommodating the second acoustic driver, the first housing contains the first chamber and the second chamber located on both sides of the first acoustic driver, the first chamber is acoustically connected with one hole of the pair of first sound guide holes and the second chamber is acoustically connected with another hole of the specified pair of first sound guide holes and the second body contains a third chamber and a fourth chamber located on both sides of the second acoustic driver, the third chamber is acoustically connected to one hole from the said pair of second sound guide holes, and the fourth chamber is acoustically connected to another hole from the said pair of second sound guide holes. 6. Acoustic output device according to claim 5, in which the first sounds contain the first part output from one hole of the specified pair of first sound guide holes, and the second part output from another hole of the specified pair of first sound guide holes, and the first part has an inverse phase with respect to the phase of the second part. 7. Acoustic output device according to any one of paragraphs. 1-3, in which the magnetic system also contains: the first magnetic conductive component mechanically connected to the first surface of the first magnetic component, a second magnetic conductive component mechanically connected to a second surface of the first magnetic component, the second surface being opposed to the first surface of the first magnetic component; and at least a third magnetic component, wherein said at least one third magnetic component is mechanically connected to each of the following components: said second magnetic conductive component and said at least one second magnetic component.

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