RU2801637C1 - Acoustic output device - Google Patents

Abstract

FIELD: acoustics.

SUBSTANCE: acoustic output device comprises sound vibration excitation means configured to generate sounds having opposite phases, and sounds with opposite phases are radiated outwardly from at least two sound guide holes, respectively. The housing is made with the possibility of placing vibration excitation means in it, and containing a contact surface with the user, moreover, when the user wears an acoustic output device on himself, the contact surface with the user is made with the possibility of contact with the user's body, and the included angle between the connection line of the indicated at least two sonic guide holes and the user contact surface is between 75° and 90°. Both holes are placed so that the distance from the first sound guide hole to the user contact surface is less than the distance from the second sound guide hole to the user contact surface.

EFFECT: reduced sound leakage into outer space.

9 cl, 17 dwg

Description

The technical field to which the invention belongs

The present disclosure relates to the field of acoustics and, in particular, to acoustic output devices.

State of the art

An open binaural acoustic output device is an audio output device that enhances sound transmission within a specific range. Compared with traditional earplugs and over-the-ear headphones, the open binaural acoustic output device has the ability to not block or cover the external auditory canal, which allows users to receive sound information from the environment when listening to music and improve user safety and comfort. Due to the use of an open structure, the sound leakage of an open binaural acoustic output device can be greater than that of a standard earphone. Currently, an open binaural acoustic output device may have problems of insufficient sound volume and relatively significant sound leakage.

Therefore, it is desirable to provide a more efficient acoustic output that can increase the listening volume for the user and reduce sound leakage.

Disclosure of the essence of the invention

Some embodiments of the present disclosure provide an acoustic output device. The acoustic output device may comprise: at least one acoustic driver, wherein said at least one acoustic driver produces sounds with opposite phases, and the sounds with opposite phases are radiated outward from at least two sound guide holes, respectively; and a housing structure configured to accommodate said at least one acoustic exciter and containing a contact surface with the user, while when the user wears the acoustic output device on himself, the contact surface with the user is made with the possibility of contact with the user's body. The included angle between the connection line of the said at least two sound guide holes and the contact surface with the user may be in the range from 75° to 90°.

In some embodiments, the at least two sonic guide holes may comprise a first sonic guide hole and a second sonic guide hole. The distance from the first sound guide hole to the user contact surface may be less than the distance from the second sound guide hole to the user contact surface.

In some embodiments, the distance from the first sonic guide hole to the user contact surface may be less than or equal to 5 mm.

In some embodiments, the distance from the first sonic guide hole to the user contact surface may be less than or equal to 2 mm.

In some embodiments, the distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 2 mm.

In some embodiments, the distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 0.5 mm.

In some embodiments, said at least one acoustic driver may comprise a diaphragm and a magnetic circuit design. The side of the diaphragm facing away from the magnetic circuit structure may form the front side of said at least one acoustic driver. The side of the magnetic circuit structure facing away from the diaphragm may form the rear side of said at least one acoustic driver. The diaphragm may vibrate to cause sounds of said at least one acoustic driver to be emitted outward from the front side and from the rear side of said at least one acoustic driver, respectively.

In some embodiments, said at least one acoustic driver may comprise a first acoustic driver and a second acoustic driver. The first acoustic driver may include a first diaphragm. The second acoustic driver may include a second diaphragm. The sound produced by the vibration of the first diaphragm and the sound produced by the vibration of the second diaphragm may have opposite phases. Sounds generated by vibration of the first diaphragm and the second diaphragm may be radiated outwardly from at least two sound guide holes, respectively.

In some embodiments, the at least two sound guide holes may have an absorbent layer.

In some embodiments, the implementation of the absorbent layer may be a metal filter mesh or gauze mesh.

Other embodiments of the present disclosure provide an acoustic output device. The acoustic output device may comprise at least one acoustic driver, said at least one acoustic driver being configured to generate sounds having opposite phases, and sounds with opposite phases being radiated outward from at least two sound guide holes, respectively; and a housing structure configured to accommodate said at least one acoustic exciter and containing a contact surface with the user, while when the user wears an acoustic output device, the contact surface with the user is made with the possibility of contact with the user's body. The included angle between the connection line of said at least two sonic guide holes and the contact surface with the user may be in the range from 0° to 15°.

In some other embodiments, said at least two sonic guide holes may comprise a first sonic guide hole and a second sonic guide hole, and the distance from the first sonic guide hole or from the second sonic guide hole to the user contact surface may be less than or equal to 5 mm .

The distance from the first sonic guide hole or from the second sonic guide hole to the user contact surface may be less than or equal to 2 mm.

In other embodiments, the distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 2 mm.

In other embodiments, the distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 0.5 mm.

In other embodiments, said at least one acoustic driver may comprise a diaphragm and a magnetic circuit design. The side of the diaphragm facing away from the magnetic circuit structure may form the front side of said at least one acoustic driver. The side of the magnetic circuit structure facing away from the diaphragm may form the rear side of said at least one acoustic driver. The diaphragm may vibrate so that said at least one acoustic driver emits sounds outward from the front side and rear side of said at least one acoustic driver, respectively. In other embodiments, said at least one acoustic driver may comprise a first acoustic driver and a second acoustic driver. The first acoustic driver may include a first diaphragm. The second acoustic driver may include a second diaphragm. The sound generated by the vibration of the first diaphragm and the sound generated by the vibration of the second diaphragm may have opposite phases. Sounds generated by vibration of the first diaphragm and the second diaphragm may be radiated outwardly from said at least two sound guide holes, respectively.

Brief description of the drawings

The present disclosure is further illustrated in terms of exemplary embodiments. These exemplary embodiments are described in detail with reference to the drawings. These embodiments do not limit exemplary embodiments in which like reference numerals represent like structures, in which:

fig. 1 is a schematic representation of two sonic guide holes and a user contact surface of a housing structure in accordance with some embodiments of the present disclosure;

fig. 2 is a schematic representation of a dipole in accordance with some embodiments of the present disclosure;

fig. 3 shows the principle of operation of the dipole and the surface of contact with the user, corresponding to some embodiments of the present disclosure;

fig. 4 is the position of the dipole relative to the area of the user's face, in accordance with some embodiments of the present disclosure;

fig. 5 is an equivalent circuit diagram for representing the principle of operation illustrating the sound reflection of a dipole generated by the region of the user's face, in accordance with some embodiments of the present disclosure;

fig. 6 are frequency responses of acoustic output devices with two point sound sources located at different distances d and different distances D from a single point sound source to the region of the user's face, according to some embodiments of the present disclosure;

fig. 7 is a diagram of the sound field energy distribution of two point sources of sound at a frequency of 1000 Hz, corresponding to some embodiments of the present disclosure;

fig. 8 is a schematic representation of the position of the dipole relative to the area of the user's face, according to some embodiments of the present disclosure;

fig. 9 is an equivalent diagram illustrating a dipole sound reflection generated by a user's face region, in accordance with some embodiments of the present disclosure;

fig. 10 shows the frequency responses of acoustic output devices with two point sound sources at different distances d between them and at different distances D from one point sound source to the area of the user's face, corresponding to some embodiments of the present disclosure;

fig. 11 is the energy distribution of the sound field of two point sources of sound at a frequency of 1000 Hz, corresponding to some embodiments of the present disclosure;

fig. 12 is a graph of the sound pressure for the included angle between the connection line of two sound guide holes and the contact surface with the user or body part of the user under various conditions, according to some embodiments of the present disclosure;

fig. 13 is a block diagram of an exemplary acoustic output device in accordance with some embodiments of the present disclosure;

fig. 14 is a block diagram of another exemplary acoustic output device in accordance with some embodiments of the present disclosure;

fig. 15 is a block diagram of another exemplary acoustic output device in accordance with some embodiments of the present disclosure;

fig. 16 is a block diagram of an exemplary acoustic output device in accordance with some embodiments of the present disclosure; And

fig. 17 is a block diagram of an exemplary acoustic output device in accordance with some embodiments of the present disclosure.

Implementation of the invention

In order to more clearly illustrate the technical solutions associated with the embodiments of the present disclosure, the following is a brief description of the drawings related to the description of the embodiments. Obviously, the drawings described below only serve as some examples or embodiments. Those skilled in the art, without any further creative effort, may apply the present disclosure to other similar scenarios in accordance with these drawings. Unless the context clearly implies otherwise, or the context says something else, the same numerical position refers to the same structure or operation.

It should be understood that the terms "system", "device", "unit" and/or "module" as used herein are only a way of distinguishing between various components, elements, parts, sections or assemblies of various levels. However, if the same purpose can be achieved with other words, the words may be replaced by other formulations.

As used in the disclosure and in the appended claims, the singular includes the plural unless the content explicitly states otherwise; the plural forms may also be intended to contain the singular forms. In general, the terms "comprise", "comprises" and/or "comprising", "include", "includes" and/or "comprising" simply suggest the need to contain steps and elements that have been explicitly identified, and these steps and elements do not constitute an exhaustive list. The methods or devices may also contain other steps or elements.

The flowcharts used in the present disclosure demonstrate the operations that the system implements in accordance with an embodiment of the present disclosure. It should be understood that the above or subsequent operations may not necessarily be performed in order. Instead, the operations can be processed in reverse order or simultaneously. In addition, one or more operations may be added to these processes, or one or more operations may be removed from these processes.

In some embodiments, the acoustic output device may comprise an acoustic driver and a housing structure. The acoustic exciter may be located within the housing structure. The sound produced by the at least one acoustic driver in the acoustic output device can propagate outwards through at least two guide holes acoustically connected to the at least one acoustic driver. In some embodiments, two acoustic holes that are acoustically associated with the same driver may be placed on the same side of the user's head or face. In this case, the user's head or face can be roughly considered as a baffle. The baffle can reflect the sound emitted by the two sound guide holes. In space, the sound reflected by the baffle can interact with the sound emitted directly by each of the two sound guide holes, thereby changing the amplitude of the sound transmitted by the acoustic output device to a particular location. In some embodiments, by choosing the distance and angle between the sound guide hole and the user's head or face, the sound produced by the acoustic output device in the environment can be of relatively low amplitude, thereby reducing the sound leakage of the acoustic output device into the environment, as well as preventing listening to the sound generated by the acoustic output device by others in the vicinity of the user.

The present disclosure provides an acoustic output device. In some embodiments, an acoustic output device may be combined with an article such as glasses, a headset, a head-worn display device, an AR/VR helmet, and so on. In this case, the acoustic output device may be attached near the user's ear by a suspension method or a clip method. When the user wears the acoustic output device, the acoustic output device may be positioned on at least one side of the user's head, covering but not obstructing the user's ear canal. In some alternative embodiments, the external surface of the acoustic output device may include a hook and the shape of the hook may match the shape of the pinna so that the acoustic output device can be independently put on the user's ear with the hook. An acoustic output device independently worn on the user's ear can communicate with a signal source (eg, computer, mobile phone, or other mobile devices) in a wired or wireless (eg, Bluetooth) manner. For example, an acoustic output device worn on the left ear and/or on the right ear can communicate directly with the signal source wirelessly. As another example, an acoustic output device worn on the left ear and/or on the right ear may comprise a first output device and a second output device. The first output device may communicate with the signal source, and the second output device may communicate wirelessly with the first output device. Audio may be played back in sync between the first output device and the second output device using one or more timing signals. The wireless method may include, but is not limited to, Bluetooth, local area network, wide area network, wireless personal area network, near field communication, and the like. or any combination of them. The acoustic output device may be worn on the user's head (e.g., open headphones worn as glasses, headband, or other structures that do not fit on the ear) or may be worn on other parts of the user's body (e.g., neck, shoulders, or face area). of the user) or may be positioned near the user's ear in any other way (eg, carried by hand). At the same time, the acoustic driver may cover, but not block, the user's auditory canal so that the ear can be kept open. The user can hear not only the sound output from the acoustic output device, but also perceive the sound from the external environment. For example, an acoustic output device may be located around or partially around the user's ear and may transmit sound via air conduction or via bone conduction.

The acoustic driver may be a component capable of receiving an electrical signal and converting the electrical signal into an audio signal suitable for output. In some embodiments, when separating frequencies according to acoustic driver frequencies, the type of acoustic driver may comprise low frequency acoustic driver (e.g., 30 Hz - 150 Hz), mid-low frequency acoustic driver (e.g., 150 Hz - 500 Hz), acoustic driver mid-high frequencies (for example, 500 Hz - 5 kHz), high frequency acoustic exciter (for example, 5 kHz - 16 kHz), acoustic exciter for the entire frequency range (for example, 30 Hz - 16 kHz), etc. or any combination of them. The low frequency, high frequency, etc. referred to herein may simply be used to indicate an approximate range of frequencies. In other application scenarios, the frequencies may be separated in other ways. For example, a crossover point may be specified. Low frequencies may indicate a frequency range that is below the crossover point, and high frequencies may indicate a frequency range that is above the crossover point. The crossover point can be any value within the audible range that the user's ear can hear, such as 500 Hz, 600 Hz, 700 Hz, 800 Hz, 1000 Hz, and so on. In some embodiments, when separated by acoustic driver, the acoustic driver may include, but is not limited to, a moving coil acoustic driver, a moving core acoustic driver, a piezoelectric acoustic driver, an electrostatic acoustic driver, a magnetostrictive acoustic driver, etc. . The acoustic exciter may have a diaphragm. When the diaphragm vibrates, sound can be transmitted from the front side and from the back side of the diaphragm, respectively. The sound transmitted from the front side of the acoustic driver diaphragm and the sound transmitted from the rear side of the acoustic driver diaphragm may have the same amplitude and opposite phases. In this case, when the sounds transmitted from the front and back sides of the diaphragm of the acoustic output device are radiated to the outside through the respective sound guide holes, both parts of the sound can interact during the propagation process, thus reducing the sound leakage of the acoustic output device in the far field. In some embodiments, the acoustic driver may include a diaphragm and a magnetic circuit design. The diaphragm and the magnetic circuit design may be arranged in series along the vibration direction of the diaphragm. In some embodiments, the diaphragm may be mounted on a carrier frame and the carrier frame may be mounted on a magnetic circuit structure. Alternatively, the diaphragm may be directly and rigidly connected to the side wall of the magnetic circuit structure. The side of the diaphragm facing away from the magnetic circuit structure may form the front side of the acoustic driver. The side of the magnetic circuit structure facing away from the diaphragm may form the rear side of the acoustic driver. The diaphragm may vibrate to cause the acoustic driver to emit sound outward from the front side and the back side of the acoustic driver, respectively. The acoustic driver may also include a voice coil. The voice coil may be mounted on the side of the diaphragm facing the magnetic circuit structure and located in the magnetic field generated by the magnetic circuit structure. When a power supply is applied, the voice coil can vibrate under the influence of a magnetic field and cause the diaphragm to vibrate, thereby creating sound. The vibration of the diaphragm can cause the acoustic driver to emit sound from the front side and the rear side of the acoustic driver, respectively.

The housing design may be a closed or semi-closed housing design with an internal opening. The acoustic exciter may be located within the housing structure. The housing structure may be a housing structure shaped to fit the user's ear. The shape of the body structure may include a round ring, an oval (regular or irregular) polygon, a U-shape, a V-shape, a semi-circle, etc., so that the body structure can be directly attached to the user's ear. In some embodiments, the housing structure may also include one or more fastening structures. The mounting structure may include an earhook, headband, or elastic band that can be used to secure the acoustic output device to the user and to prevent the acoustic output device from falling. Just by way of example, the fastening structure may be an earhook capable of being worn around the user's ear. Just by way of example, the fastening structure may be an earhook capable of being worn around the user's ear. In some embodiments, the earhook may be a continuous hook-shaped component and may resiliently expand to fit over the wearer's ear. In this case, the earhook may also apply additional pressure to the user's pinna, thereby securing the acoustic output device in position on the user's ear or head. In some embodiments, the earhook may be a discontinuous band. For example, the earhook may include a rigid portion and a flexible portion. The rigid portion may be made of a rigid material (eg, plastic or metal). The rigid portion may be attached to the housing structure of the acoustic output device through a physical connection (eg, clasp connection, screw connection, etc.). The flexible portion may be made from a resilient material (eg, fabric, composite, and/or neoprene).

The body structure may include at least one first sonic guide hole and at least one second sonic guide hole. The first sonic guide hole and the second sonic guide hole may respectively be associated with the front and rear sides of the diaphragm in the same acoustic driver. When the user wears the acoustic output device, the housing design may allow the first sound guide hole and the second sound guide hole to be located on the same side of the user's face. In some embodiments, the front side of the acoustic driver (diaphragm) in the housing structure may include a front chamber for sound transmission. The anterior chamber may be acoustically coupled to the first sound guide hole. The sound transmitted from the front side of the acoustic driver may be transmitted from the first sound guide hole through the front chamber. The rear side of the acoustic exciter (diaphragm) in the housing structure may contain a rear chamber for sound transmission. The rear chamber may be acoustically coupled to the second sound guide hole. The sound transmitted from the rear side of the acoustic driver may be transmitted from the second sound guide hole through the rear chamber. In some embodiments, the anterior chamber and rear chamber designs can be adjusted such that sounds exiting the sound guide hole on the front side of the acoustic driver and sounds exiting the sound guide hole on the rear side of the acoustic driver can satisfy a certain condition. For example, the lengths of the anterior chamber and the posterior chamber may be chosen such that sounds with a certain phase relationship (e.g., opposite phases) can be output through the sound guide hole on the front side of the acoustic driver and through the sound guide hole on the rear side of the acoustic driver. As a result, the problem of sound leakage in the far field of the acoustic output device can be effectively solved. In some embodiments, the shape of the sonic guide hole may include, but is not limited to, a square, round, or prismatic shape.

In some scenarios, the housing design may include a user contact surface. When a user wears an acoustic output device, the contact surface with the user may coincide with or be close to a part of the user's body (eg, face, head). For convenience of description, the user contact surface may also be referred to as the user projection surface. The user projection surface can be understood as the surface of the body structure with the largest projection area on the part of the user's body that may be closer to the user's body than the acoustic driver. When the user wears the acoustic output device, the user contact surface may be considered to be substantially parallel to a part of the user's body (eg, facial region) that is in direct contact with or faces the user contact surface. When the user wears the acoustic output device on himself, regardless of whether the contact surface is close to the user or whether it is in contact or not in contact with the user's body part, the acoustic output device can output sound to the outside of the body structure through the sound guide holes on the body structure, thereby transmitting sound to the user's ear. In some embodiments, the shape of the user contact surface may comprise a regular shape, such as a circle, ellipse, rectangle, triangle, diamond, etc., or an irregular shape. In some embodiments, the user contact surface may be a flat plane or may be a surface containing one or more convex or concave regions. In some embodiments, the user contact surface may comprise a layer of silicone material or a layer of hard plastic material (eg, rubber, plastic, etc.). A layer of silicone material or a layer of hard plastic material may cover and be adhered to the outer surface of the housing structure, or may be molded integrally with the housing structure. It should be noted that the shape and structure of the user contact surface of the housing structure is not limited to the above description, and can be adjusted according to a specific condition, which is not further limited here.

In FIG. 1 schematically shows two sonic guide holes and a user contact surface of a housing structure according to some embodiments of the present disclosure. As shown in FIG. 1, in some embodiments, the at least two sonic guide holes may comprise a first sonic guide hole B ₁ and a second sonic guide hole B ₂ . The first sound guide hole B ₁ and the second sound guide hole B ₂ can radiate sound to the outside by means of a dipole or a dipole-like method. The distance from the first sound guide hole B ₁ to the user contact surface (the parallelogram in FIG. 1 may represent the user contact surface) may be less than the distance from the second sound guide hole B ₂ to the user contact surface. The connecting line of the first sound guide hole B ₁ and the second sound guide hole B ₂ may have an intersection point A with the user contact surface. The normal vector to the user contact surface at point A can be a vector . The direction vector of the connection line of the first sonic guide hole B ₁ and the second sonic guide hole B ₂ may be a vector . vector direction may be a direction from the first sound guide hole B ₁ to the second sound guide hole B ₂ . Vector the direction of the connection line of the first sonic guide hole B ₁ and the second sonic guide hole B ₂ may have an angle γ with the vector normal to the user contact surface at point A.

In some embodiments, when a user is wearing an acoustic output device, the user contact surface may be substantially parallel to a portion of the user's body (eg, facial region) that is in direct contact with or faces the user contact surface. For convenience of description, hereinafter, the user's face area is used as an example of the user's body part. In other words, the user contact surface of the acoustic output device may be substantially parallel to the facial region. In this case, the angular relationship between the face area and the connection line between the at least two sonic guide holes may be substantially equivalent to the angular relationship between the user contact surface and the connection line between the at least two sonic guide holes.

In some embodiments, the connection line between the at least two sound guide holes may be approximately perpendicular to the face region, that is, the connection line between the at least two sound guide holes may be approximately perpendicular to the user contact surface. Approximate perpendicularity to that mentioned herein may mean that the included angle between the user contact surface and the connection line of the first sonic guide hole B ₁ and the second sonic guide hole B ₂ is in the range of 75° to 90°. In embodiments of the present disclosure, the included angle between the user contact surface and the connection line between the at least two sonic guide holes may refer to the complementary angle of the included angle (γ) formed between the vector direction and vector normal to the user contact surface at point A. For example, when the included angle between the connection line of the first sonic guide hole B ₁ and the second sonic guide hole B ₂ and the user contact surface is in the range of 75° to 90°, the included angle γ between vector direction (which represents the connection line of the first sonic guide hole B ₁ and the second sonic guide hole B ₂ ) and the vector the normal to the contact surface with the user at point A can be in the range from 0° to 15°. Just for example, in the case where the user contact surface contacts the user's body part, to draw a line connecting the first sound guide hole B ₁ and the second sound guide hole B ₂ approximately perpendicular to the user contact body part, the first sound guide the hole B ₁ and the second sonic guide hole B ₂ can be located on the side of the housing structure, which in this case is perpendicular or approximately perpendicular to the user contact surface. As another example, when the user contact surface is close to but not in contact with the user's body part, to draw a line connecting the first sound guide hole B ₁ and the second sound guide hole B ₂ approximately perpendicular to the user contact body part, the first the sonic guide hole B ₁ and the second sonic guide hole B ₂ may be located on a side of the housing structure which in this case is perpendicular or approximately perpendicular to the user contact surface, or alternatively, in the same case, the first sonic guide hole B ₁ may be located on the user contact surface, and the second sonic guide hole B ₂ may be located on the side of the housing structure opposite the user contact surface. Preferably, the included angle between the connection line between the at least two sound guide holes and the user contact surface may be 90°. In this case, the included angle γ between the vector direction (which represents a line connecting the first sonic pilot hole and the second sonic pilot hole) and the vector normal to the surface of contact with the user at point A can be equal to 0°. When the connection line between the at least two sound guide holes is approximately perpendicular to the face area, the sounds output by the acoustic output device from the at least two sound guide holes may be reflected by the user's face area. In the far-field space, the reflected sound can interact with the sound directly emitted by the acoustic output device, thereby reducing the far-field sound and improving the far-field sound leakage performance.

In some embodiments, the front side or diaphragm of the acoustic driver and the housing structure may form the first chamber. The rear side of the acoustic exciter and the housing structure may form a second chamber. The front side of the acoustic driver may emit sound towards the first chamber, and the rear side of the acoustic driver may emit sound towards the second chamber. In some embodiments, the housing structure may further comprise a first sonic guide hole and a second sonic guide hole. The first sound guide hole may be associated with the first chamber. The second sound guide hole may be associated with the second chamber. The sound generated on the front side of the acoustic driver may propagate outwardly through the first sound guide hole. The sound generated on the rear side of the acoustic driver may propagate outwards through the second sound guide hole. In some embodiments, the magnetic circuit design may include a magnetically conductive plate located opposite the diaphragm. The conductive plate may include at least one sonic guide hole (also known as a pressure relief hole) configured to direct sound generated by diaphragm vibration away from the back of the acoustic driver and propagate the sound out through the second chamber. The acoustic output device can form a point-to-point sound source (or multi-point sound source) similar to a dipole structure using sound emission from the first sound guide hole and the second sound guide hole, and create a certain sound field with a certain directivity.

In some embodiments, the acoustic driver front and housing structure may form a chamber. The front side of the acoustic driver may emit sound towards the camera, and the rear side of the acoustic driver may emit sound directly to the outside of the acoustic output device. In some embodiments, the housing structure may include one or more sonic guide holes. The sound guide hole(s) may be acoustically coupled to the chamber and direct the sound emitted by the acoustic driver from the front of the chamber to the outside of the acoustic output device. In some embodiments, the magnetic circuit design may include a magnetically conductive plate located opposite the diaphragm. The magnetic conductive plate may include one or more sonic guide holes (also known as pressure relief holes). The sound guide hole(s) can direct the sound generated by the diaphragm from the rear side of the acoustic driver to the outside of the acoustic output device. Since the sound guide hole(s) on the front side of the acoustic driver and the sound guide hole(s) on the rear side of the acoustic driver are on both sides of the diaphragm, it can be considered that the sound guided by the sound guide hole(s) on the front side of the acoustic driver, and the sound guided by the sound guide hole(s) on the rear side of the acoustic driver are of opposite or approximately opposite phases. Therefore, the sound guide hole(s) on the front side of the acoustic driver and the sound guide hole(s) on the rear side can form a two-point sound source.

In some embodiments, the rear side of the acoustic driver and the housing structure may form a chamber. The rear side of the acoustic driver may emit sound towards the camera, and the front side of the acoustic driver may emit sound directly to the outside of the acoustic output device. In some embodiments, the magnetic circuit design may include a magnetically conductive plate located opposite the diaphragm. The magnetic conductive plate may include one or more sonic guide holes (also known as pressure relief holes). The sound guide hole(s) can direct the sound generated by the vibration of the diaphragm from the rear side of the acoustic driver towards the camera. In some embodiments, the housing structure may include one or more sonic guide holes. The sound guide hole(s) may be acoustically coupled to the chamber and direct the sound emitted by the acoustic driver into the chamber to the outside of the acoustic output device. In some embodiments, one or more sonic guide holes may be located on a side wall of the housing structure adjacent to the magnetic circuit structure. For example, when the user is wearing the acoustic output device, the diaphragm may face the person's ear and the connection line between one or more sound guide holes and the center location of the front side of the diaphragm may be approximately perpendicular to the user's face. As another example, when the user wears the acoustic output device, the diaphragm may not face the person's ear, the diaphragm may be located at the top or bottom of the housing structure, and one or more sound guide holes may be located in the housing structure at locations opposite the diaphragm, so that the connection line between the one or more sound guide holes and the center position of the front side of the diaphragm may be approximately parallel to the user's face. In some cases, the sound transmitted from the front side of the diaphragm towards the outside and the sound directed from the sound guide hole(s) can be considered to have opposite or approximately opposite phases, so that the front side of the diaphragm and the sound guide hole(s) can form a two-point sound source.

In some embodiments, the acoustic output device may comprise a first acoustic driver and a second acoustic driver. The first acoustic driver may include a first diaphragm. The second acoustic driver may include a second diaphragm. The first acoustic driver and the second acoustic driver may respectively receive the first electrical signal and the second electrical signal. In some embodiments, when the first electrical signal and the second electrical signal are of the same magnitude and opposite phases (e.g., the first acoustic driver and the second acoustic driver are electrically connected to the signal source with opposite polarities, respectively, and receive the same original audio electrical signal emitted by the source signal), the first diaphragm and the second diaphragm can produce sounds with opposite phases. Additionally, a first acoustic driver and a second acoustic driver may be located in the housing structure. The sound generated by the vibration of the first diaphragm can be emitted to the outside through the first sound guide hole located on the body structure. The sound created by the vibration of the second diaphragm can be emitted through the second sound guide hole located on the body structure. For convenience of description, the sound generated by the vibration of the first diaphragm may be referred to as the sound generated by the front side of the first acoustic driver. The sound generated by the vibration of the second diaphragm may be referred to as the sound generated by the front side of the second acoustic driver. When the sound generated by the vibration of the first diaphragm and the sound generated by the vibration of the second diaphragm are directly emitted to the outside through the respective first sound guide hole and the second sound guide hole, the first sound guide hole and the second sound guide hole here can be roughly considered as a double sound source (for example , point-to-point sound source). In some embodiments, the first sonic guide hole may be located opposite the second sonic guide hole. For example, when the user is wearing the acoustic output device, the first sound guide hole may face the person's ear and the connection line between the first sound guide hole and the second sound guide hole may be approximately perpendicular to the user's face. As another example, when the user wears the acoustic output device, the side wall of the acoustic output device adjacent to the side wall on which the first sound guide hole or the second sound guide hole is located may face the human ear and the connection line between the first sound guide hole hole and the second sound guide hole may be approximately parallel to the user's face.

In some embodiments, the first acoustic driver and the second acoustic driver may be the same or similar acoustic drivers such that the frequency responses of the first acoustic driver and the second acoustic driver over the entire frequency band are the same or similar. In some embodiments, the first acoustic driver and the second acoustic driver may be different acoustic drivers. For example, the frequency responses of the first acoustic driver and the second acoustic driver may be the same or similar in the mid-high frequency band. The frequency responses of the first acoustic driver and the second acoustic driver may differ in the low frequency band.

In some embodiments, the first acoustic driver may be located in the first chamber. The first acoustic driver may include a first diaphragm. The front side of the first acoustic driver and the housing structure may form the first front chamber. The rear side of the first acoustic driver and the housing structure may form the first rear chamber. The front side of the first acoustic driver may emit sound into the first front chamber. The rear side of the first acoustic driver may emit sound into the first rear chamber. The second acoustic driver may be located in the second chamber. The front side of the second acoustic driver and the housing structure may form a second front chamber. The rear side of the second acoustic driver and the housing structure may form a second rear chamber. The front side of the second acoustic driver may emit sound into the second front chamber. The rear side of the second acoustic driver may emit sound into the second rear chamber. In some embodiments, the first chamber and the second chamber may be the same. The first acoustic driver and the second acoustic driver may be disposed in the first chamber and the second chamber, respectively, in the same manner, so that the first anterior chamber and the second anterior chamber may be the same. The first rear camera and the second rear camera may be the same. Therefore, the acoustic impedances of the front sides or rear sides of the first acoustic driver and the second acoustic driver may be the same. In other embodiments, the first chamber and the second chamber may be different. The impedances of the front sides or rear sides of the first acoustic driver and the second acoustic driver can be made the same by changing the size and/or length of the chambers or by adding a sonic guide tube. The first acoustic driver may include a first diaphragm. The second acoustic driver may include a second diaphragm. In this case, the acoustic impedance of the first diaphragm and one of the at least two sound guide holes may match the acoustic impedance of the second diaphragm and the other of the at least two sound guide holes.

In some embodiments, an acoustic absorbing structure (e.g., metal filter mesh, gauze mesh, tuning net, tuning wool, sonic guide tube, etc.) may be provided in the sound guide hole to reduce the amplitude of the frequency response corresponding to the front side or back side. acoustic driver, so that the amplitude of the frequency response corresponding to the front side of the acoustic driver can be close to or equal to the amplitude of the frequency response corresponding to the rear side of the acoustic driver.

In FIG. 2 schematically shows a dipole in accordance with some embodiments of the present disclosure. In FIG. 3 shows the basic principle of dipole operation and user contact surface according to some embodiments of the present disclosure. To further illustrate the influence of the location of the sound guide holes of an acoustic output device on the result of the sound output of the acoustic output device, and assuming that sound can be considered as propagating outward from the sound guide holes, each sound guide hole of the acoustic output device can be considered as a sound source that outputs sound to the outside. . Just for convenience of description and for illustrative purposes, when the size of each of the sound guide holes of an acoustic output device is relatively small, each sound guide hole can be roughly considered as a point sound source. As shown in FIG. 2 and FIG. 3, the two sound guide holes of the acoustic output device can be considered as two point sources of sound. The emitted sounds can have the same amplitude and opposite phases, which can be represented by the symbols "+" and "-", respectively. The two sound guide holes may form a dipole, or may be dipole-like, and sounds radiated outward may have a clear directionality, forming an "8"-shaped sound emission area. In the direction of a straight line connecting the sound guide holes, the sounds emitted from the sound guide holes may be loudest, and the volume of sounds emitted from other directions may obviously decrease. Two sound guide holes can form different sounds at different points in space, which can be calculated according to the angle θ between two lines, one of which is a connection line between the midpoint of the connection line of two sound guide holes and any point in space, and the other line is line connecting two sound guide holes. In some embodiments, any sound guide hole located on an acoustic output device for sound output can be roughly considered as a single point sound source of the acoustic output device. The sound pressure p of the sound field generated by a single point sound source can be represented by the equation:

… (1)

where |A|/r is the sound pressure amplitude, ω is the angular frequency, r is the distance between a point in space and the sound source, and k is the wavenumber. The sound pressure value of the sound field of a point sound source can be inversely proportional to the distance between the point in space and the point sound source of the point.

Sound radiated by the acoustic output device to the environment (ie, far field leakage sound) can be reduced by arranging at least two sound guide holes in the acoustic output device so as to form a two-point sound source. In some embodiments, the acoustic output device may comprise at least two sound guide holes, i. e. two-point sound source. The sound output from the two sound guide holes may have a certain phase difference. When the location and phase difference of the point-to-point sound source satisfies certain conditions, the acoustic output device can produce different near-field and far-field sound effects. For example, when the phases of the sound point sources corresponding to the two sound guide holes are opposite, that is, when the absolute value of the phase difference of the two sound point sources is 180°, the far-field leakage sound can be reduced according to the anti-phase sound wave compensation principle. As shown in FIG. 2, the distance between the centers of the sound guide holes of the acoustic output device may be equal to d, which may form a dipole (the dipole may be considered as a combination of two pulsating spheres with opposite phases, located at a distance of d). In this case, the sound pressure at the target point p in space generated by the output device can be represented by the equation:

… (2)

where A is the intensity of the diaphragm vibrations, |A|/r ₊ is the intensity of the point source of sound "+", |A|/r_ is the intensity of the point source of sound "-", ω is the angular frequency, k is the wave number, r ₊ is the distance between the target point and the point sound source "+", and r_- the distance between the target point and the point sound source "-". When just the far-field sound field is considered and it is assumed that r >> d, the amplitude difference between the sound waves emitted by two point sound sources and reaching the target point can be very small and the amplitudes r ₊ and r_ in the above equation can be replaced by r, but the phase difference cannot be ignored and have the following approximate relationship:

… (3)

where r is the distance between any target point p in space and the central location of the two-point sound source, d is the distance between two point sound sources, θ is the included angle between the straight line on which the two-point sound source is located and the connecting line between the target point p and center of a two-point sound source. According to the equations above, when the frequency is not too high, kd < 1, equation (2) can be simplified as follows:

… (4)

According to equation (4), the sound pressure p at the target point of the sound field can be related to the included angle θ between the straight line on which the two-point sound source is located and the connection line between the straight line on which the two-point sound source is located and the line connection between the target point and the center of the two-point sound source, and d is the distance between the two point sound sources.

In FIG. 4 is a schematic representation of the position of a dipole relative to the face region of a user, in accordance with some embodiments of the present disclosure. In FIG. 5 is an equivalent principle diagram showing the reflection generated by a user's face region for dipole sound, in accordance with some embodiments of the present disclosure. As shown in FIG. 4 and FIG. 5, when the user wears the acoustic output device, the at least two sound guide holes of the acoustic output device can be considered as a two-point sound source. The two sound sources can respectively output sounds with the same amplitude and opposite phases (represented by the symbols "+" and "-", respectively), which can form a dipole. In this case, at any spatial point in the user's environment, if the distances between the spatial point and two single point sound sources are equal, based on the sound interaction compensation principle, the sound volume at that point may be very small. When the distances from a spatial point to two single-point sound sources are not equal, then the greater the difference in distance, the greater the volume of the sound at the point. When the included angle between the connection line of two single-point sound sources and the face area (for simplicity, the plane in which the user's face area is located that exactly matches or faces the acoustic output device is equivalent to the face area) is between 75° and 90°, the connection line between two single-point sound sources can be considered to be approximately perpendicular to the face area. In some embodiments, when the user is wearing the acoustic output device, the user contact surface on the acoustic output device housing structure may be substantially parallel to the facial region, in which case the two single point sound sources can also be considered to be approximately perpendicular to the contact surface. with the user. For ease of understanding, as shown in FIG. 4, the facial region may be represented as a baffle 410. The distance between two single point sound sources defined by at least two sound guide holes in an acoustic output device may be denoted as d. The shortest distance between two single-point sound sources and baffle 410 may be denoted as D. When two single-point sound sources produce sounds, some of the sounds may be directly emitted to the environment, and another part of the sounds may be radiated first to baffle 410, reflected by baffle 410, and then radiate to the environment. In an ideal situation, in the presence of a baffle, the sound emission effect of two single-point sound sources to the environment can be equivalent to the basic principle circuit shown in FIG. 5. As shown in FIG. 5, a point-to-point sound source formed by two sound guide holes of an acoustic output device may form a dipole, which may be located on the right side of baffle 510. The distance between sound sources in a point-to-point sound source may be d. The distances from the point-to-point sound source to the baffle 510 may not be equal. The shortest distance between the point-to-point sound source and the baffle 510 may be D. The angle between the straight line on which the point-to-point sound source is located and the connection line between the center of the point-to-point sound source and any viewing point P in space may be θ. The distance from the center of the two-point sound source to the observation point P may be equal to r2. Assuming that the sound output from the point-to-point sound source can be reflected by the baffle 510, this is equivalent to forming a virtual point-to-point sound source on the left side of the baffle with the same amplitude as the point-to-point sound source and phases opposite to the point-to-point sound source. A virtual point-to-point sound source can form a dipole. The distance between the sound sources of a virtual point-to-point sound source can be equal to d. The smallest distance between the virtual point-to-point sound source and the baffle 510 may be D. The distance between the center of the connection line of the virtual point-to-point sound source and the observation point P may be r1. The virtual point-to-point sound source and the point-to-point sound source may form a double dipole. The included angle between the partition and the connection line between the observation point and the center of the double dipole may be equal to α. The distance between the center of the double dipole and the observation point can be equal to r. The sound pressure at the point of observation can be represented by the equation:

… (5)

In the far field, the difference in the amplitudes of acoustic waves at the observation point P can be neglected, but the phase difference can remain. If the angle between the normal line at the center of the double dipole and the connection line between the observation point and the center of the double dipole is α, then according to the drawing, θ ≈π/2-α, and the approximate relationship can be represented as follows:

… (6)

… (7)

The sound pressure can be obtained according to Equations (5), (6) and (7) above and Equation (8) below, and the synthesized sound pressure is the sound pressure generated by two single point sound sources to the environment, when there is a partition:

… (8)

In FIG. 6 shows the frequency responses of acoustic output devices with two point sound sources at different distances d and at different distances D when the two point sound sources are positioned in the manner shown in FIG. 4, in accordance with some embodiments of the present disclosure. Distance D represents the shortest distance from a point-to-point sound source to the user's face area. In FIG. 7 shows the sound field energy distribution of two point sound sources at a frequency of 1000 Hz when the two point sound sources are arranged in the manner shown in FIG. 4, in accordance with some embodiments of the present disclosure. As shown in FIG. 6 and FIG. 7, a connection line between the at least two sound guide holes of the acoustic output device may be perpendicular to the user's face region (ie, perpendicular to a user contact surface that is parallel or substantially parallel to the user's face region). When the far-field observation point is 250 mm away, sound pressure values can be respectively tested when D is 0 mm, 1 mm, 2 mm, or 3 mm and the corresponding d is 0.5 mm, 1 mm, 1.5 mm, or 2 mm. The sound pressure value can be expressed as sound pressure level (dB). In FIG. 6 it can be seen that the smallest distance between the dipole and the partition is in the range from 0 mm to 5 mm. The distance between the dipole and the baffle and the distance between the dipole can affect the sound pressure at the point of observation in the far field. Additionally, the sound pressure level at the point of view in the far field may decrease as the distance between the dipole and the baffle decreases. The sound pressure level at the point of observation in the far field can decrease as the distance between the dipole decreases. When the distance between the dipole and the baffle is 0 and the distance between the dipole is 0.5 mm, the sound pressure level at the far field observation point can be the smallest, and the sound leakage reduction effect in this case can be relatively good. As shown in FIG. 7, when the connection line between at least two sound guide holes of the acoustic output device is approximately perpendicular to the contact surface with the body of the user, the smallest distance between the dipole and the baffle is 3 mm, the distance between the dipole is 0.5 mm, and the frequency is 1 kHz, the area outside semi-circle with a radius of 250 mm can be a far-field sound field, and it can be seen that the color of the far-field sound pressure level is relatively light, that is, the far-field sound pressure level can be relatively small and the leakage sound in the far field can be relatively small. In some embodiments, the volume of the leakage sound in the far field of the acoustic output device can be reduced by adjusting the distance between the sound guide hole and the user contact surface or the user's face area. The at least two sonic guide holes may comprise a first sonic guide hole and a second sonic guide hole. The distance from the first sound guide hole to the face area or user contact surface may be less than the distance from the second sound guide hole to the face area or user contact surface. Preferably, the distance from the first sound guide hole to the user contact surface may be less than or equal to 5 mm. More preferably, the distance from the first sonic guide hole to the user contact surface may be less than or equal to 2 mm. Additionally, preferably, the first sound guide hole may be located on the contact surface with the user. In other embodiments, the user's body part may function as a baffle. The location relationship between the first sound guide hole, the second sound guide hole, and the user contact surface may also be applicable to the relationship between the first sound guide hole, the second sound guide hole, and a user's body part (eg, facial region). For example, in some embodiments, when the user is wearing the acoustic output device (i.e., when the user contact surface on the body structure is close to or near the face region), the distance from the first sound guide hole to the user's body part may be less than the distance from the second sound guide hole to the user's body part. Preferably, the distance from the first sound guide hole to the user's body part may be less than or equal to 5 mm. More preferably, the distance from the first sound guide hole to the user's body part may be less than or equal to 2 mm. It should be noted that the user's body part here refers to the part with the largest projection area of the user contact surface on the user's body when the user wears the acoustic output device. In some embodiments, the loudness of the leakage sound in the far field of the acoustic output device can be reduced by adjusting the distance between the two sound guide holes. The distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 5 mm. Preferably, the distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 2 mm. More preferably, the distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 0.5 mm.

In FIG. 8 schematically shows the position of a dipole relative to a user's face region, in accordance with some embodiments of the present disclosure. In FIG. 9 is an equivalent main diagram showing reflection performed by a user's face region for a dipole sound, in accordance with some embodiments of the present disclosure. As shown in FIG. 8 and FIG. 9, when the user wears the acoustic output device, the at least two sound guide holes of the acoustic output device can be considered as two single-point sound sources and can form a two-point sound source. Two single-point sound sources can output sounds with the same amplitude and opposite phases (represented by the symbols "+" and "-", respectively) to form a dipole. In this case, for any spatial point in the environment in which the user is located, when the distances between the spatial point and two single-point sound sources are equal, based on interference sound suppression, the sound volume at that point can be very small. When the distances from a spatial point to two single-point sound sources are not equal, then the greater the difference in distances, the greater the sound volume at the said point. When the included angle between the connection line of two single-point sound sources and the face region (for simplicity, the plane in which the user's face region is located that exactly matches or faces the acoustic output device is equivalent to the face region) is between 0° and 15°, the connection line between two single point sound sources can be considered to be approximately parallel to the face area. In some embodiments, when the user is wearing the acoustic output device, the user contact surface on the acoustic output device housing structure may be substantially parallel to the facial region, in which case the two single point sound sources may also be considered to be approximately parallel to the contact surface. with the user. For ease of understanding, as shown in FIG. 8, the area of the face can be represented as a septum. The distance between two single point sound sources formed by at least two sound guide holes in the acoustic output device may be equal to d. The shortest distance between one of the two single-point sound sources and the baffle can be equal to D. When two single-point sound sources generate sounds, some of the sounds can be emitted directly to the environment, and the other part of the sounds can be radiated first to the baffle, reflected by the baffle, and then radiated to the environment. Wednesday. In an ideal situation, in the presence of a screen, the sound emission effect of two single-point sound sources to the environment could be equivalent to that shown in the basic operating principle diagram of FIG. 9. As shown in FIG. 9, a point-to-point sound source formed by two sound guide holes of an acoustic output device may form a dipole, which may be located on the right side of the baffle. The distance between the sound sources of a two-point sound source can be equal to d. The distances from the sound sources of a two-point sound source to the partition may be equal. The shortest distance between the two-point sound source and the baffle may be equal to D. The angle between the straight line on which the two-point sound source is located and the line connecting the center of the two-point sound source and any observation point P in space may be equal to θ. The distance from the center of the two-point sound source to the observation point P may be equal to r2. Assuming that the sound output from the two-point sound source can be reflected by the baffle, this is equivalent to forming a virtual two-point sound source on the left side of the baffle with the same amplitude and the same phase as the two-point sound source. A virtual point-to-point sound source can form a dipole. The distance between the sound sources of a virtual point-to-point sound source can be equal to d. The smallest distance between the virtual point-to-point sound source and the partition may be D. The distance between the center of the connection line of the virtual point-to-point sound source and the observation point P may be r1. The virtual point-to-point sound source and the point-to-point sound source may form a double dipole. The included angle between the screen and the connection line between the observation point and the center of the double dipole can be equal to α. The distance between the center of the double dipole and the observation point can be equal to r. The sound pressure at the observation point can be represented by equation (9) below:

… (9)

In the far field, the difference in the amplitudes of acoustic waves at the observation point P can be neglected, but the phase difference can remain. If the angle between the normal to the center of the double dipole and the connection line of the observation point and the center of the double dipole is α, then according to the drawing, θ ≈ α and the approximate ratio is as follows:

… (10)

… (eleven)

The synthesized sound pressure can be obtained based on equations (9), (10) and (11) above and the following equation (12):

… (12)

In FIG. 10 shows the frequency responses of acoustic output devices with two point sound sources located at different distances d and different distances D when the two point sound sources are positioned in the manner shown in FIG. 8 corresponding to some embodiments of the present disclosure. In FIG. 11 shows the sound field energy distribution of two point sound sources at a frequency of 1000 Hz when the two point sound sources are arranged in the manner shown in FIG. 8 corresponding to some embodiments of the present disclosure. As shown in FIG. 10 and FIG. 11, the connection line between the at least two sound guide holes of the acoustic output device may be approximately parallel to the user's face area (ie, perpendicular to a user contact surface that is parallel or substantially parallel to the user's face area). When the observation point is 250mm away in the far field, the sound pressure can be tested respectively for cases where the distance D is 0mm, 1mm, 2mm or 3mm and the corresponding distance d is 0.5mm, 1mm, 1, 5 mm or 2 mm. The sound pressure value can be expressed as sound pressure level (dB). It should be noted that when the connection line between the first sound guide hole and the second sound guide hole is approximately parallel to the user's face area or user contact surface, the distance from the first sound guide hole to the user's face area or user contact surface and the distance from the second sound guide openings up to the user's face area or up to the user contact surface may be equal or substantially equal. Essentially equal here may mean that the difference between the distance from the first sound guide hole to the user's face area (or user contact surface) and the distance from the second sound guide hole to the user's face area (or user contact surface) is in certain limits. The defined limits here may be less than or equal to 5 mm, less than or equal to 3 mm, or less than or equal to 1.5 mm. Just by way of example, the at least two sonic guide holes may comprise a first sonic guide hole and a second sonic guide hole. The distance from the first sound guide hole to the face area or user contact surface may be close to the distance from the second sound guide hole to the face area or user contact surface. Preferably, the distance from the first sound guide hole to the user contact surface may be less than or equal to 5 mm. More preferably, the distance from the first sonic guide hole to the user contact surface may be less than or equal to 2 mm. In FIG. 10 it can be seen that the smallest distance between the dipole and the screen is in the range from 0 mm to 5 mm. The distance between the dipole can have a huge impact on the far field sound pressure at the far field viewpoint. Additionally, the far field sound pressure level at the far field viewpoint may decrease as the distance between the sound sources in the dipole decreases. When the distance between sound sources in the dipole is 0.5 mm, the far-field sound pressure level at the far-field observation point can be the smallest, and the sound leakage reduction effect can be relatively good in this case. In some embodiments, the loudness of the leakage sound in the far field of the acoustic output device can be reduced by adjusting the distance between the sound guide hole and the user contact surface or face area of the surface. The at least two sonic guide holes may comprise a first sonic guide hole and a second sonic guide hole. The distance from the first sound guide hole to the face area or user contact surface may be less than the distance from the second sound guide hole to the face area or user contact surface. Preferably, the distance from the first sound guide hole to the user contact surface may be less than or equal to 5 mm. More preferably, the distance from the first sonic guide hole to the user contact surface may be less than or equal to 2 mm. The first sound guide hole and the second sound guide hole may both be located on the user contact surface, or the first sound guide hole and the second sound guide hole may respectively be located on two side walls adjacent to the user contact surface on the housing structure. As shown in FIG. 10, when the connection line between at least two sound guide holes of the acoustic output device is approximately parallel to the face area of the user's body, the smallest distance between the dipole and the baffle is 3 mm, the distance between the sound sources of the dipole is 0.5 mm, and the frequency is 1 kHz, the area outside the semi-circle with a radius of 250 mm can be the far sound field, and it can be seen that the color in the region of the half "8" shape of the near sound field is relatively dark, that is, the sound pressure level in this near sound field region can be relatively large and the sound volume in the near field can be relatively large. In the direction perpendicular to the dipole connection line, the color of part of the area is lighter, that is, the sound field sound pressure level in this area is smaller and the sound leakage is smaller. In this case, the volume of the leakage sound in the far field of the acoustic output device can be reduced by adjusting the distance between the two sound guide holes. The distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 2 mm. Preferably, the distance between the first sonic guide hole and the second sonic guide hole may be less than or equal to 0.5 mm.

In FIG. 12 is a graph of the sound pressure for the included angle between the connection line of two sound guide holes and the contact surface with the user or body part of the user under various conditions in accordance with some embodiments of the present disclosure. A dipole formed by at least two sound guide holes of an acoustic output device according to FIG. 12 may have a minimum distance of 3 mm from the user's body part (septum). The distance between the dipole sources can be 0.5 mm. The far field region may be a region other than a circle with the center of the dipole as the origin and a radius of 250 mm. In the drawing, the horizontal axis may represent the angle between the far-field observation point and the center of the dipole, and the vertical axis may represent the sound pressure at the observation point. The solid line in the drawing may be a relationship curve between the absolute value of the sound pressure at the far field viewpoint and the view angle (the angle between the normal at the center of the double dipole and the connection line between the viewpoint and the center of the double dipole) when the connection line is between at least two sound guide holes of the acoustic output device are approximately perpendicular to the area of the user's face. The sound pressure at the observation point in the far field can gradually increase as the observation angle increases within the range from 0 to π/2. When the observation angle is π/2, that is, when the connection line between the far-field observation point and the center of the dipole is perpendicular to the baffle, the absolute value of the sound pressure can be maximum. The sound pressure at the far-field viewpoint can gradually decrease as the angle between the viewpoint and the center of the dipole increases, ranging from π/2 to π. The dotted line in the figure may be a relationship curve between the absolute sound pressure value at the far field viewpoint and the view angle when the dipole formed by the at least two sound guide holes of the acoustic output device is approximately parallel to the user's face area. The sound pressure at the observation point in the far field can gradually decrease as the angle between the observation point and the center of the dipole increases from 0 to π/2. When the observation angle is π/2, that is, when the connection line between the far field observation point and the center of the dipole is perpendicular to the baffle, the absolute value of the sound pressure may be minimal. The sound pressure at the far-field viewpoint can gradually increase as the angle between the viewpoint and the center of the dipole increases, ranging from π/2 to π. The absolute value of the maximum sound pressure when the dipole formed by at least two sound guide holes of the acoustic output device is approximately perpendicular to the area of the user's face may be less than the absolute value of the maximum sound pressure when the dipole formed by at least two sound guide holes of the acoustic exit device, approximately parallel to the face area of the surface.

In FIG. 13 is a schematic representation of an exemplary acoustic output device in accordance with some embodiments of the present disclosure. In some embodiments, the sonic guide holes of FIG. 13 may be suitable for generating a point-to-point sound source or dipole as described elsewhere in this disclosure. As shown in FIG. 13, the acoustic driver 1200 may include a diaphragm 1201 and a magnetic circuit structure 1222. Acoustic driver 1200 may also include a voice coil (not shown). The voice coil may be fixed on the side of the diaphragm 1201 facing the direction of the magnetic circuit structure 1222 and located in the magnetic field generated by the magnetic circuit structure 1222. When power is applied, the voice coil may vibrate under the action of the magnetic field and cause the diaphragm 1201 to vibrate, thereby producing sound. For ease of description, the side of the diaphragm 1201 facing away from the magnetic circuit structure 1222 (i.e., the right side of the diaphragm 1201 in FIG. 13) may be considered the front side of the acoustic driver 1200. The side of the magnetic circuit structure 1222 facing away from the diaphragm 1201 (i.e., the left side of the magnetic circuit structure 1222 in FIG. 13) can be considered as the rear side of the acoustic driver 1200. The vibration of the diaphragm 1201 can cause the acoustic driver 1200 to emit sound from the front side and from the rear side of the acoustic driver, respectively. . As shown in FIG. 13, the front side or diaphragm 1201 of the acoustic driver 1200 and the housing structure 1210 may form the first chamber 1211. The rear side of the acoustic driver 1200 and the housing structure 1210 may form the second chamber 1212. the side of the acoustic driver 1200 may radiate sound into the second chamber 1212. In some embodiments, the body structure 1210 may further comprise a first sound guide hole 1213 and a second sound guide hole 1214. The first sound guide hole 1213 may be associated with the first chamber 1211. The second sound guide hole opening 1214 may be coupled to second chamber 1212. Sound generated by the front side of acoustic driver 1200 may propagate outward through first sound guide hole 1213. Sound generated by rear side of acoustic driver 1200 may propagate outward through second sound guide hole 1214. In some embodiments, the magnetic circuit structure 1222 may include a magnetically conductive plate 1221 located opposite the diaphragm. The magnetically conductive plate 1221 may include at least one sound guide hole 1223 (also known as a pressure relief hole) configured to direct the sound generated by the vibration of the diaphragm 1201 away from the rear side of the acoustic driver 1200 and propagate the sound to and through the second chamber 1212. The acoustic output device can form a point-to-point sound source (or multiple sound sources) like a dipole structure by emitting sound through the first sound guide hole 1213 and the second sound guide hole 1214, and generate a certain sound field with some directivity. In some embodiments, the acoustic driver 1220 may directly output sound to the outside, that is, the acoustic output device 1200 may not have a first chamber 1211 and/or a second chamber 1212. The sound emitted from the front and rear of the acoustic driver 1220 may be used as dual sound source. It should be noted that the acoustic output device in the embodiments of the present disclosure is not limited to use in headphones and may also be applicable to other audio output devices (eg, hearing aid, microphone, etc.).

In FIG. 14 is a schematic representation of another exemplary acoustic output device in accordance with some embodiments of the present disclosure. In FIG. 15 is a schematic representation of another exemplary acoustic output device in accordance with some embodiments of the present disclosure. As shown in FIG. 14, the connection line between the first sound guide hole 1313 of the first acoustic driver 1320 and the second sound guide hole 1314 of the second acoustic driver 1330 may be approximately perpendicular to the user's body part or the user contact surface of the acoustic output device. The first acoustic driver 1320 and the second acoustic driver 1330 may be the same acoustic driver. The signal processing module may control the front side of the first acoustic driver 1320 and the front side of the second acoustic driver 1330 by means of a control signal (e.g., a first electrical signal and a second electrical signal) to generate sounds whose phases and amplitudes satisfy a certain condition (e.g., sounds with the same amplitude and opposite phases, sounds with different amplitudes and opposite phases, etc.). The sound generated by the front side of the first acoustic driver 1320 may be emitted to the outside of the acoustic output device 1310 through the first sound guide hole 1313. The sound generated by the front side of the second acoustic driver 1330 may be emitted to the outside of the acoustic output device 1310 through the second sound guide hole 1314. the guide hole 1313 and the second sound guide hole 1314 may be equivalent to a dual sound source producing sounds with opposite phases. Unlike the case where the dual sound source is generated by sounds emitted by the front side and back side of the acoustic driver, the front sides of the two acoustic drivers, namely the front side of the first acoustic driver 1320 and the front side of the second acoustic driver 1330, sounds with opposite phases can be be generated and radiated out through the first sound guide hole 1313 and the second sound guide hole 1314. When the acoustic impedance from the first acoustic driver 1320 to the first sound guide hole 1313 is the same or similar to the acoustic impedance from the second acoustic driver 1330 to the second sound guide hole 1314, the sounds emitted by the first sound guide hole 1313 and the second sound guide hole 1314 in the acoustic output device 1310 can create an effective dual sound source, that is, the first sound guide hole 1313 and the second sound guide hole 1314 can more accurately emit sounds with opposite phases. In the far field, especially in the middle of the high frequency band (for example, 200 Hz - 20 kHz), the sound emitted by the first sound guide hole 1313 and the sound emitted by the second sound guide hole 1314 can cancel out better, which can cancel out better to some extent. sound leakage of the acoustic output device in the middle of the high frequency band, and can prevent other nearby users from listening to the sound generated by the acoustic output device 1310, thereby improving the sound leakage reduction effect of the acoustic output device 1310.

When the front side of the first acoustic driver 1320 and the front side of the second acoustic driver 1330 are located on different sides of the body structure, and the first sound guide hole 1313 and the second sound guide hole 1314 are also located on different sides of the body structure 1310, the body structure 1310 can act as a partition between the double a sound source (for example, the sound emitted by the first sound guide hole 1313 and the sound emitted by the second sound guide hole 1314). In this case, the housing structure 1310 may separate the first sound guide hole 1313 and the second sound guide hole 1314 so that the first sound guide hole 1313 and the second sound guide hole 1314 can have different acoustic sound paths to the user's ear canal. On the one hand, the location of the first sound guide hole 1313 and the second sound guide hole 1314 on both sides of the housing structure 1310 can increase the sound path difference between the first sound guide hole 1313 and the second sound guide hole 1314 (that is, the difference in the length of the path of sounds that emitted from the first sound guide hole 1313 and the second sound guide hole 1314 and reach the user's ear canal), so that the sound compensation effect in the user's ear (i.e., in the near field) is attenuated, thereby increasing the volume of the sound heard by the user's ear (also known as near field sound) and provide the user with the best listening experience. On the other hand, the housing structure 1310 may have little effect on the sounds emitted by the sound guide holes to the environment (also known as far-field sound) and the far-field sounds produced by the first sound guide hole 1313 and the second sound guide hole 1314. , can be even better compensated, which can suppress the sound leakage of the acoustic output device 1300 to some extent, and at the same time can prevent the sound generated by the acoustic output device 1300 from being heard by others near the user. Therefore, by the above construction, the listening volume of the near field acoustic output device 1300 can be increased, and the leakage sound volume of the far field acoustic output device 1300 can be reduced.

The general design of the acoustic output device shown in FIG. 15 may be similar in design to the acoustic output device shown in FIG. 14. The difference between the common designs may be that the front side of the first acoustic driver 1320 is facing down, the front side of the second acoustic driver 1330 is facing up, the first sound guide hole 1313 on the body structure 1310 is configured to output the sound emitted by the front side of the first acoustic driver 1320, the second sound guide hole 1314 on the body structure 1310 is configured to output the sound emitted by the front side of the second acoustic driver 1330, and the connection line between the dipole formed by the sound emitted by the first sound guide hole 1313 and the sound emitted by the second sound guide hole , 1314 may be approximately parallel to a part of the user's body or the user contact surface of the acoustic output device.

In some embodiments, to improve the noise canceling effect of the acoustic output device, the acoustic output device may further comprise at least one microphone. At least one microphone may be configured to receive a noise signal from the external environment. The microphone can transmit the noise signal to the signal processing module of the acoustic output device. The signal processing unit may generate an audio signal with the opposite phase and the same amplitude as the noise signal based on parameters (such as phase and amplitude) of the noise signal to achieve noise reduction. In FIG. 16 is a schematic representation of an exemplary acoustic output device in accordance with some embodiments of the present disclosure. As shown in FIG. 16, when the connection line between the dipole formed by the sounds emitted by the two sound guide holes of the acoustic output device, 1600 (represented by the "+" and "-" symbols shown in FIG. 16) is approximately perpendicular to the region of the user's face, the microphone 1601 can be positioned in the housing structure 1610 of the acoustic output device 1600, or in the acoustic driver (eg, in the design of the magnetic circuit). In some embodiments, the implementation of the microphone 1601 may be located inside or outside the side wall of the structure 1610 housing. In some embodiments, the microphone 1601 may also be located on the side wall of the housing structure 1610 on the peripheral side of the magnetic circuit structure. In some embodiments, when the microphone 1601 is receiving environmental noise to reduce the sound emitted by the acoustic output device 1600 itself, the microphone 1610 may be located away from the sound guide hole, for example, the microphone 1601 may be located on a side wall that is different from the side wall, on which the sound guide hole is located in the housing structure 1610. Additionally, when the connection line between the dipole formed by the sounds in the two sound guide holes of the acoustic output device 1600 is approximately perpendicular to the region of the user's face, the acoustic output device may have a minimum sound pressure region (i.e., the dotted line in FIG. 16 and the area near the dotted lines). The minimum sound pressure region may refer to a region in which the intensity of the sound produced by the acoustic output device is relatively small. For example, the lighter areas 701 and 702 in FIG. 7. In some embodiments, the microphone 1601 may be located in the minimum sound pressure region of the acoustic output device. Namely, as shown in FIG. 16, when the connection line between the point-to-point sound source formed by at least two sound guide holes of the acoustic output device 1600 is approximately perpendicular to the user's face area, three areas of relatively strong sound field (e.g., sound field area 1621, sound field area 1622, and sound field area 1623 sound field shown in Fig. 16) and two areas of minimum sound pressure (ie, the dotted line in Fig. 16 and the area near the dotted line) can occur simultaneously. In combination with FIG. 7 and FIG. 16, regions of relatively strong sound field may correspond to the three dark regions (eg, region 703, region 704, and region 705) shown in FIG. 7. The areas of minimum sound pressure may correspond to the two relatively light color areas 701 and 702 shown in FIG. 7. One or more microphones 1601 may be located in the relatively light color regions 701 and 702 shown in FIG. 7. Preferably, one or more microphones 1601 may be located on the center line of region 701 relative to the light color and/or region 702 in FIG. 7, that is, on the dotted lines shown in FIG. 16. By positioning the microphone 1601 in the minimum sound pressure region of the acoustic output device of the microphone 1601, as little sound as possible can be obtained from the acoustic device 1600 itself when receiving environmental noise, so that the microphone 1601 can provide more realistic ambient sound for subsequent audio signal processing to realize such a function as the active noise canceling of the acoustic output device 1600.

In FIG. 17 schematically shows an exemplary acoustic output device in accordance with some embodiments of the present disclosure. As shown in FIG. 17, when the connection line between the dipole formed by the sounds emitted by the two sound guide holes of the acoustic output device 1700 (represented by the "+" and "-" symbols shown in FIG. 17) is approximately parallel to the region of the user's face, the microphone 1701 may be positioned at housing structure 1710 of the acoustic output device 1700 or in the acoustic driver (eg, magnetic circuit design). In some embodiments, the implementation of the microphone 1701 may be located inside or outside the side wall of the structure 1710 housing. In some embodiments, the microphone 1701 may also be located on the side wall of the housing structure 1710 on the peripheral side of the magnetic circuit structure. In some embodiments, when the microphone 1701 receives environmental noise, to reduce the sound emitted by the acoustic output device 1700 itself, the microphone 1710 may be located away from the sound guide hole, for example, the microphone 1701 may be located on a side wall other than the side wall. wall, in which the sound guide hole is located on the body structure 1710. Additionally, when the connection line between the sound sources of the dipole formed by the sounds of the two sound guide holes of the acoustic output device 1700 is approximately parallel to the area of the user's face, the acoustic output device may have a minimum sound pressure area (i.e., outlined by the dotted line in FIG. 17 and areas near the dotted line). In some embodiments, the microphone 1701 may be located in the minimum sound pressure region of the acoustic output device. Namely, as shown in FIG. 17, when the connection line between the point-to-point sound source formed by at least two sound guide holes of the acoustic output device 1700 is approximately parallel to the area of the user's face, two sound field areas with relatively high sound pressure (e.g., area 1721 and area 1722 shown in FIG. 17) and the area of minimum sound pressure (i.e. bounded by the dotted line and the area around the dotted line in Fig. 16) can be presented simultaneously. In combination with FIG. 11 and FIG. 17, relatively strong sound field regions 1721 and 1722 may correspond to two dark relatively high sound pressure regions 1102 and 1103 as shown in FIG. 11. The minimum sound pressure area may correspond to the light-colored minimum sound pressure area 1101 shown in FIG. 11. One or more microphones 1701 may be located along the dotted line shown in FIG. 17, and in the area around the dotted line. Preferably, one or more microphones 1701 may be located along the dotted lines shown in FIG. 17. By positioning the microphone 1701 in the minimum sound pressure region of the acoustic output device 1700, the microphone 1701 can receive as little sound as possible from the acoustic device 1700 itself while still receiving ambient noise so that the microphone 1701 can provide more realistic surround sound for further processing. audio signal in order to implement a function such as active noise reduction of the acoustic output device 1700.

It should be noted that acoustic output device 1600 in FIG. 16 and acoustic output device 1700 in FIG. 17 are merely illustrations. The acoustic output device may also be an output device with two acoustic drivers, such as the acoustic output devices shown in FIG. 14 and FIG. 15, that is, the conditions for selecting microphone positions (eg, microphone 1601 and microphone 1701) may also apply to the acoustic output devices shown in FIG. 14 and FIG. 15.

Having thus described the basic concepts to those skilled in the art upon reading this detailed disclosure, it may be reasonably apparent that the above detailed disclosure is intended to be exemplary only and not restrictive. Various changes, improvements and modifications may take place and are intended for those skilled in the art, although this is not explicitly stated here. These changes, improvements, and modifications are intended to be offered by this disclosure and are intended to be consistent with the spirit and protection scope of the exemplary embodiments of the present disclosure.

In addition, certain terminology has been used to describe embodiments of the present disclosure. For example, the terms "one embodiment", "an embodiment", and/or "certain embodiments" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present disclosure. Therefore, it is emphasized and understood that two or more references to "an embodiment" or "one of the embodiments" or "an alternative embodiment" in various parts of this specification do not necessarily all refer to the same embodiment. Additionally, specific features, structures, or characteristics may be combined as needed in one or more embodiments of the present disclosure.

Additionally, those skilled in the art should understand that the approaches of the present disclosure may be demonstrated and described herein in any of a variety of patentable classes or contexts, including any new and useful process, machine, manufacture, or formulation, or any new and useful improvement thereof. Accordingly, aspects of the present disclosure may be implemented entirely in hardware, entirely in software (including firmware, resident software, microcode, etc.), or a combined software and hardware implementation, which may commonly be referred to herein as a "data unit". ”, “module”, “mechanism”, “unit”, “component”, or “system”. Additionally, the approaches of the present disclosure may take the form of a computer program product implemented on one or more computer-readable media having a computer-readable control program implemented thereon.

The computer-readable storage signal carrier may comprise a propagating data signal with a computer-readable control program implemented thereon, for example, in baseband or as part of a carrier wave. Such a propagating signal may take any number of forms, including electromagnetic, optical, and the like. or any suitable combination thereof. A computer-readable medium can be any computer-readable medium that is not a computer-readable storage medium and that can transmit, distribute, or transport a program for use in or in connection with an execution system, devices, or device. A control program implemented on a computer-readable medium may be transmitted using any suitable medium, including wireless communication, wired communication, fiber optic cable, RF cable, and the like. or any appropriate combination of the above.

A computer control program for performing the operations of the approaches of this disclosure may be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB. NET, Python, etc., standard procedural programming languages such as the "C" programming language, Visual Basic, Fortran 2003, Perl, KOBOL 2002, PHP, ABAP, dynamic programming languages such as Python, Ruby and Groovy or others programming languages. The control program may run entirely on the user's computer, partially on the user's computer as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter scenario, the remote computer can connect to the user's computer through any type of network, including a local area network (LAN) or wide area network (WAN), or the connection can be established with an external computer (for example, over the Internet using an ISP) or cloud computing environment or offered as a service, such as Software as a Service (SaaS).

In addition, the present order of processing elements or sequences or the use of numbers, letters or other designations is therefore not intended to limit the claimed processes and methods in any order except as may be defined in the claims. Although the above disclosure is discussed with various examples, which are now considered to be a variety of useful embodiments of the disclosure, it should be understood that such details are for that purpose only and that the appended claims are not limited to the disclosed embodiments, but rather are intended to cover modifications and equivalents. constructions that are within the spirit and protection scope of the disclosed embodiments. For example, while the implementation of the various components described above may be implemented in a hardware device, it may also be implemented only as a software solution, such as installation on an existing server or mobile device.

Similarly, it should be understood that in the above description of the present disclosure, various features are sometimes grouped together in a single embodiment, drawing, or description thereof for the purpose of optimizing assistance in understanding one or more of the various inventive embodiments. This mode of disclosure, however, should not be interpreted as reflecting the intent that the claimed subject matter requires more features than are expressly described in each claim. Rather, inventive embodiments are contained in less than all of the features of the single aforementioned disclosed embodiment.

In some embodiments, numbers expressing quantities, properties, and the like used to describe and claim certain embodiments of the application are to be understood as being modified in some instances by the term "about", "approximately", or "substantially". For example, "about", "approximately", or "substantially" may indicate a change in value within ±20% of the value it describes, unless otherwise noted. Accordingly, in some embodiments, the numerical parameters given in the written description and in the appended claims are approximations that may vary depending on the desired properties to be obtained in a particular embodiment. In some embodiments, the implementation of the numerical parameters should be interpreted in light of the number of significant figures reported and using the usual methods of rounding. While the ranges of numbers and parameters setting broad limits in some embodiments of the application are approximations, the numerical values given in the specific examples are reported as accurately as practicable.

Each of the patents, patent applications, publications of patent applications and other materials such as articles, books, descriptions, publications, documents, facts and/or the like mentioned herein are hereby incorporated herein by reference in their entirety for for all purposes, except for any prosecution documents related to them, any of them that are inconsistent or contrary to this document, or any of them that may have a limiting effect on the broadest scope of the requirements of the claims, now or later related to this document. As an example, if there is any inconsistency or conflict between the description, definition and/or use of a term associated with any material contained herein and in connection with this document, the description, definition and/or use of the term given in this document shall prevail.

In conclusion, it is to be understood that the application embodiments disclosed herein are illustrative of the principles of the application's embodiments. Other modifications that may be used may be within the scope of the application. Thus, by way of example, and not limitation, alternative configurations of embodiments of the application may be used in accordance with the principles set forth herein. Accordingly, the embodiments of the present application are not limited exactly to what has been shown and described.

Claims (15)

1. Acoustic output device, containing: at least one acoustic driver, wherein said at least one acoustic driver is configured to generate sounds having opposite phases, and sounds with opposite phases are radiated outwardly from at least two sound guide holes, respectively; And a housing structure configured to accommodate said at least one acoustic exciter and containing a contact surface with the user, moreover, when the user wears the acoustic output device on himself, the contact surface with the user is made with the possibility of contact with the user's body, and an included angle between the connection line of said at least two sound guide holes and the contact surface with the user is in the range from 75° to 90°, wherein said at least two sound guide holes comprise the first sound guide hole and the second sound guide hole, and the distance from the first sound guide hole to the contact surface with the user is less than the distance from the second sound guide hole to the contact surface with the user. 2. The acoustic output device of claim 1, wherein the distance from the first sound guide hole to the user contact surface is less than or equal to 5 mm. 3. The acoustic output device of claim 2, wherein the distance from the first sound guide hole to the user contact surface is less than or equal to 2 mm. 4. The acoustic output device according to claim 1, wherein the distance between the first sound guide hole and the second sound guide hole is less than or equal to 2 mm. 5. The acoustic output device according to claim 1, wherein the distance between the first sound guide hole and the second sound guide hole is less than or equal to 0.5 mm. 6. The acoustic output device of claim 1, wherein said at least one acoustic driver comprises a diaphragm and a magnetic circuit structure, the side of the diaphragm facing away from the magnetic circuit structure forms the front side of said at least one acoustic driver, the side of the magnetic circuit structure , facing away from the diaphragm, forms the rear side of said at least one acoustic driver, and the diaphragm is configured to vibrate to cause said at least one acoustic driver to emit sounds outward from the front side and from the rear side of said at least one acoustic driver, respectively. . 7. The acoustic output device of claim 1, wherein said at least one acoustic driver comprises a first acoustic driver and a second acoustic driver, the first acoustic driver comprises a first diaphragm, the second acoustic driver comprises a second diaphragm, the sound generated by vibration of the first diaphragm, and the sound generated by the vibration of the second diaphragm have opposite phases, and the sounds generated by the vibration of the first diaphragm and the second diaphragm are radiated to the outside from said at least two sound guide holes, respectively. 8. Acoustic output device according to claim 1, wherein said at least two sound guide holes are provided with an absorbing layer. 9. Acoustic output device, containing: at least one acoustic driver, wherein said at least one acoustic driver is configured to generate sounds having opposite phases, and sounds with opposite phases are radiated outwardly from at least two sound guide holes, respectively; And a housing structure configured to accommodate said at least one acoustic exciter and containing a contact surface with the user, moreover, when the user wears the acoustic output device on himself, the contact surface with the user is made with the possibility of contact with the user's body, and an included angle between the connection line of the specified at least two sound guide holes and the contact surface with the user is in the range from 0° to 15°, wherein said at least two sound guide holes comprise the first sound guide hole and the second sound guide hole, and the distance from the first sound guide hole to the contact surface with the user is less than the distance from the second sound guide hole to the contact surface with the user.