RU2790965C1 - Acoustic output device - Google Patents

Abstract

FIELD: acoustics; speakers.

SUBSTANCE: acoustic output device contains an acoustic exciter containing the first diaphragm; the second acoustic pathogen containing the second diaphragm; a control circuit electrically connected to the first acoustic driver and the second acoustic driver, respectively. The control circuit is configured to provide a first electrical signal for excitation of vibration of the first diaphragm and a second electrical signal for excitation of vibration of the second diaphragm, and the phase of the first electrical signal and the phase of the second electrical signal are opposite; and a housing for the first acoustic driver and the second acoustic driver. The sound generated by the vibration of the first diaphragm is radiated outward through the first sound guide hole located on the body, and the sound generated by the vibration of the second diaphragm is radiated outward through the second sound guide hole located on the body, and the difference between the frequency response of the first acoustic driver and the amplitude-frequency characteristic of the second acoustic exciter in the medium-high frequency range does not exceed 6 dB.

EFFECT: increased sound volume, reduced sound leakage.

9 cl, 8 dwg

Description

The technical field to which the invention belongs

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

State of the art

An open binaural acoustic output device is a portable acoustic output device that facilitates sound conduction within a specific range. Compared with in-ear headphones and on-ear headphones, the open binaural acoustic output device can have the characteristics of non-blocking and covering the external auditory canal, allowing users to receive sound information from the environment and at the same time the user can listen to music, improving safety and comfort. Due to the use of an open structure, sound leakage in an open binaural acoustic output device can be more severe than in traditional headphones. At present, it is common practice in the industry to use sound radiation from the front side and back side of the loudspeaker to design a two-point sound source, create a certain sound field, and adjust the sound pressure distribution to reduce sound leakage. This method can reduce sound leakage to a certain extent, but it still has some limitations. For example, since the sound waves emitted from the loudspeaker are the sound waves emitted from the front side of the diaphragm and the back side of the diaphragm, the sound waves emitted from the back side of the diaphragm need to pass through the cavity formed by the diaphragm and the electromagnetic structure (such as a magnetic guide plate), and then radiate outwardly through a hole in the electromagnetic structure, resulting in a mismatch between the acoustic impedance of the front side of the loudspeaker and the acoustic impedance of the back side of the loudspeaker. As a result, front-side and back-side sound emission cannot form an efficient two-point sound source (especially in the mid-high frequency range), and thus sound leakage may increase.

Therefore, it is desirable to provide an acoustic output device capable of providing an efficient two-point sound source while achieving the effect of increasing the volume of the sound sent to the user and reducing sound leakage.

Disclosure of the essence of the invention

One approach of the present disclosure may provide an acoustic output device. The acoustic output device may comprise: a first acoustic driver, wherein the first acoustic driver may comprise a first diaphragm; a second acoustic driver, the second acoustic driver may comprise a second diaphragm; a control circuit, wherein the control circuit may be electrically connected to the first acoustic driver and the second acoustic driver, respectively, the control circuit may provide a first electrical signal for vibrating the first diaphragm and a second electrical signal for vibrating the second diaphragm, and the phase of the first electrical signal and the phase of the second electrical signal can be opposite; and a housing, wherein the first acoustic driver and the second acoustic driver can be attached to the housing, wherein the sound generated by vibration of the first diaphragm can be radiated to the outside through the first sound guide hole located on the housing, and the sound generated by vibration of the second diaphragm can be radiated to the outside through the second sound guide hole located on the body.

In some embodiments, the first acoustic driver may comprise a first magnetic circuit structure. The second acoustic driver may comprise a second magnetic circuit structure. When the first diaphragm is driven by the first electrical signal to vibrate in the direction of the first magnetic circuit structure, the second diaphragm may be driven by the second electrical signal to vibrate in the direction away from the second magnetic circuit structure.

In some embodiments, the implementation of the body may contain at least the first cavity and the second cavity, and the first cavity may not communicate with the second cavity. The first acoustic driver may be located in the first cavity. The second acoustic driver may be located in the second cavity.

In some embodiments, the first cavity may be the same as the second cavity, wherein the anterior cavity of the first acoustic driver may be the same as the anterior cavity of the second acoustic driver and the rear cavity of the first acoustic driver may be the same as the rear cavity of the second acoustic driver .

In some embodiments, the first sonic pilot hole 113 may communicate with the first cavity and the second sonic pilot hole communicate with the second cavity. The first acoustic driver may emit sound from the first sound guide hole, the second acoustic driver may emit sound from the second sound guide hole, and the phase of the sound emitted by the first acoustic driver from the first sound guide hole may be opposite to the phase of the sound emitted by the second acoustic driver from the second sound guide hole.

In some embodiments, the first sonic guide hole and the second sonic guide hole may be located on adjacent side walls or on opposite side walls of the housing.

In some embodiments, the control circuit may generate an audio signal. The first acoustic driver and the second acoustic driver may respectively receive an audio signal of opposite polarity to obtain a first electrical signal and a second electrical signal, respectively.

In some embodiments, the first acoustic driver and the second acoustic driver may be electrically connected to the control circuit in the same polarity, respectively, wherein the first acoustic driver or the second acoustic driver may be electrically connected to the control circuit via a phase inverter circuit.

In some embodiments, the difference between the frequency response of the first acoustic driver and the frequency response of the second acoustic driver in the mid-high frequency range may be no more than 6 dB.

In some embodiments, the mid-high frequency range may be in the range of 200 Hz - 20 kHz.

In some embodiments, the difference between the frequency response of the first acoustic driver and the frequency response of the second acoustic driver in the mid-high frequency range may be no more than 10 dB.

In some embodiments, the acoustic path from the first acoustic driver or from the second acoustic driver with a higher low frequency response to the user's ear may be smaller.

In some embodiments, the posterior cavity of the first acoustic driver and the posterior cavity of the second acoustic driver may comprise at least one tuning hole.

In some embodiments, the acoustic output device may further comprise a third acoustic driver. The third acoustic driver may include a third diaphragm. The control circuit may provide a third electrical signal to cause the third diaphragm to vibrate to produce a low frequency sound. The low frequency sound can be emitted to the outside through the third sound guide hole and the fourth sound guide hole located on the cabinet.

In some embodiments, the third sonic guide hole and the fourth sonic guide hole may be located on adjacent side walls or on opposite side walls of the housing.

In some embodiments, the third sonic guide hole and the fourth sonic guide hole may be used to guide the front cavity sound of the third acoustic driver and the rear cavity sound of the third acoustic driver, respectively.

In some embodiments, the phase of the sound emitted by one of the third sound guide hole and the fourth sound guide hole, which is closer to the user's ear, may be the same as the phase of the sound emitted by one of the first sound guide hole and the second sound guide hole, which is closer to the user's ear.

In some embodiments, the sound path difference between the sound emitted from the third sound guide hole to the user's ear and the sound emitted from the fourth sound guide hole to the user's ear may be greater than the sound path difference between the sound emitted from the first sound guide hole. hole to the user's ear and the sound emitted by the second sound guide hole to the user's ear.

In some embodiments, the physical size of the third acoustic driver may be larger than the physical size of the first acoustic driver or the physical size of the second acoustic driver.

In some embodiments, the area of the third diaphragm of the third acoustic driver may be larger than the area of the first diaphragm of the first acoustic driver or the area of the second diaphragm of the second acoustic driver.

Brief description of the drawings

The present disclosure is further illustrated in terms of exemplary embodiments, and these exemplary embodiments are described in detail with reference to the drawings. These embodiments are not limiting. In these embodiments, the same number indicates the same structure, in which:

fig. 1 is a block diagram of an acoustic output device in accordance with some embodiments of the present disclosure;

fig. 2 is a block diagram illustrating the far-field sound leakage of the acoustic driver shown in FIG. 1;

fig. 3 is a block diagram of an acoustic output device in accordance with some embodiments of the present disclosure;

fig. 4 is a block diagram of an acoustic output device in accordance with some embodiments of the present disclosure;

fig. 5 is the frequency response of an acoustic output device when two acoustic drivers of an acoustic output device are the same, in accordance with some embodiments of the present disclosure;

fig. 6 is the frequency response of an acoustic output device when the two acoustic drivers of the acoustic output device are different, in accordance with some embodiments of the present disclosure;

fig. 7 is a block diagram of an acoustic output device in accordance with some embodiments of the present disclosure; And

fig. 8 is another block diagram of an acoustic output device in accordance with some embodiments of the present disclosure;

Implementation of the invention

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

It should be understood that the terms "system", "device", "unit" and/or "module" as used herein are one way of distinguishing between various components, elements, parts, sections or assemblies of various levels. However, these terms may be replaced by other expressions if they are capable of leading to the same purpose.

As shown in the present disclosure and claims, unless the context clearly indicates an exception, words in the singular do not refer only to the singular, but may contain plural forms. The terms "comprising" and "comprising" are only intended to include steps and elements that have been explicitly identified, these steps and elements are not an exclusive list, and the method or apparatus may contain other steps or elements.

Flowcharts used in the present disclosure may show operations performed by a system in accordance with embodiments of the present disclosure. It should be understood that a previous operation or a subsequent operation of a flowchart may not necessarily be implemented in exact order. On the contrary, the operations can be performed in reverse order or simultaneously. In addition, other steps may be added to these flowcharts or one or more steps may be removed from these flowcharts.

In FIG. 1 is a block diagram of an acoustic output device in accordance with some embodiments of the present disclosure. Acoustic output device 100 may include inside a hollow body 110 and acoustic driver 120 is located in the inner cavity of the housing 110. Acoustic driver 120 may include a diaphragm 121 and the structure 1220 of the magnetic circuit. Acoustic driver 120 may also include a voice coil (not shown in FIG. 1). The voice coil may be mounted on the side of the diaphragm 121 facing the magnetic circuit structure 1220 and is located in the magnetic field generated by the magnetic circuit structure 1220. When the voice coil is energized, the voice coil may vibrate under the influence of the magnetic field and cause the diaphragm 121 to vibrate, thereby generating sound. For convenience of description, the side (i.e., the right side of the diaphragm 121 shown in FIG. 1) of the diaphragm 121 facing away from the magnetic circuit structure 1220 may be referred to as the front side of the acoustic driver 120, and the side (i.e., the left side of the structure 1220 of the magnetic circuit shown in Fig. 1), the magnetic circuit structure 1220 facing away from the diaphragm 121 can be considered as the reverse side of the acoustic driver 120. Vibration of the diaphragm 121 can cause the acoustic driver 120 to radiate sound outward from the front side and from the back side. acoustic exciter 120, respectively. The front side of the acoustic driver 120 or the diaphragm 121 and housing 110 may form the front cavity 111. The reverse side of the acoustic driver 120 and housing 110 may form the rear cavity 112. The front side of the acoustic driver 120 may emit sound towards the first cavity 111 and the reverse side of the acoustic driver 120 may radiate sound towards the rear cavity 112. In some embodiments, the housing 110 may include a first sound guide hole 113 and a second sound guide hole 114. The first sound guide hole 113 may be in fluid communication with the front cavity 111 and the second sound guide hole orifice 113 may be fluidly coupled to rear cavity 112. Sound generated by the front side of acoustic driver 120 may propagate outward through the first sound guide hole 113, and sound generated by the back side of acoustic driver 120 may t propagate outwardly through the second sound guide hole 114. In some embodiments, the magnetic circuit structure 1220 may include a magnetic guide plate 1221 located opposite the diaphragm. The magnetic guide plate 1221 may be provided with at least one sound guide hole 1222 (also referred to as a pressure relief hole) to guide and propagate the sound generated by the vibration of the diaphragm 121 from the back of the acoustic driver 120 out through the rear cavity 112. Acoustic output device 100 can form a two-point sound source (or multi-point sound source) like a dipole structure by emitting sound from the first sound guide hole 113 and the second sound guide hole 114 so that a specific sound field with a certain directivity can be generated. While the sound generated by the front side of the acoustic driver 120 is directly emitted to the outside through the first sound guide hole 113 on the front cavity 111, the sound generated by the back side of the acoustic driver must first pass through the cavity formed by the diaphragm 121 and the magnetic circuit structure 1220, then pass through the sound guide hole 1222 on the magnetic circuit structure 1220 (for example, the magnetic guide plate 1221) and the second sound guide hole 114 on the rear cavity 112, and then radiate outward. As a result, there may be a large difference between the acoustic impedance of the front side of the acoustic driver 120 and the acoustic impedance of the back side of the acoustic driver 120, so the difference between the amplitude of the sound emitted by the first sound guide hole 113 and the amplitude of the sound emitted by the second sound guide hole 114 of the acoustic output device 100, is relatively large. Failure to form an efficient two-point sound source (especially in the mid-high frequency range) results in increased sound leakage. In FIG. 2 schematically shows the far-field sound leakage of the acoustic driver shown in FIG. 1. As shown in FIG. 2, the front cavity 111, the rear cavity 112, and the cavity formed by the diaphragm 121 and the magnetic circuit structure 1220 in the acoustic output device 100 can cause the sound in the front cavity 111 (the "front cavity" in FIG. 2) and the sound in the rear cavity 112 ( "rear cavity" in Fig. 2) acoustic output device 100 to form a resonant peak at the middle frequency or mid-high frequency (for example, 2000 Hz - 4000 Hz). After the resonant peak, the degree of attenuation of the frequency response of the front cavity 111 and the rear cavity 112 may be different (the frequency response of the rear cavity 112 may fall off faster), resulting in a poor frequency response of the dipole-like structure generated by the acoustic output device 100 at a relatively high frequency ( for example, the first sound guide hole 113 and the second sound guide hole 114 emit sounds with a relatively large amplitude difference). Sound leakage from the acoustic output device in the far field is poorly suppressed.

To further improve the sound output effect of the acoustic output device 100, the present disclosure may provide other or many other acoustic output devices, including at least two acoustic drivers. When the user wears the acoustic output device, the acoustic output device may be located on at least one side of the user's head, close to, but not covering, the user's ear. The acoustic output device may be worn on the user's head (e.g., an open, ear-opening headset worn as glasses, a headband, or other constructions) or on other parts of the user's body (e.g., the user's neck/shoulder region) or placed near the user's ear in another way (for example, holding it in the user's hands). In some embodiments, the acoustic output device may include a first acoustic driver, a second acoustic driver, a control circuit, and a housing. The first acoustic driver may include a first diaphragm. The second acoustic driver may include a second diaphragm. The control circuit may be electrically connected to the first acoustic driver and the second acoustic driver, respectively. The control circuit may provide a first electrical signal to cause the first diaphragm to vibrate and a second electrical signal to cause the second diaphragm to vibrate. In some embodiments, when the amplitude of the first electrical signal and the amplitude of the second electrical signal are the same, and the phase of the first electrical signal and the phase of the second electrical signal are opposite (e.g., the first acoustic driver and the second acoustic driver, respectively, are electrically connected to the control circuit in opposite polarities and receive one and the same electrical signal provided by the control circuit), the first diaphragm and the second diaphragm can form a set of sounds with opposite phases. Additionally, the housing can support the first acoustic driver and the second acoustic driver, wherein the sound generated by the vibration of the first diaphragm can be radiated outwardly through the first sound guide hole located on the body, and the sound generated by the vibration of the second diaphragm can be radiated outwards through the second sound guide hole. located on the body. For convenience of description, the sound generated by the first diaphragm may be referred to as the sound generated by the front side of the first acoustic driver, and the sound generated by 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 respective second sound guide hole, the first sound guide hole and the second sound guide hole can be approximately considered as a two-point sound source (for example , sound source with two point sources). Compared to the structures described in FIG. 1, the sound generated by the first diaphragm and the sound generated by the second diaphragm may not necessarily be emitted to the outside through the magnetic circuit structure of the acoustic driver, which can ensure that the acoustic impedance of the front side of the first acoustic driver is basically the same as the acoustic impedance front side of the second acoustic exciter. Thus, sounds emitted from the first sound guide hole and the second sound guide hole can form an effective two-point sound source. In some embodiments, the frequency response of the first acoustic driver may be the same or similar to the frequency response of the second acoustic driver in the mid-high frequency band. Because the phase of the first electrical signal to vibrate the first diaphragm is opposite to the phase of the second electrical signal to vibrate the second diaphragm, in the far field (for example, away from the user's ear), especially in the mid-high frequency band (for example, 200 Hz - 20 kHz), the sound emitted from the first sound guide hole can be shifted relative to the sound emitted from the second sound guide hole, which can suppress sound leakage of the far-field acoustic output device to some extent. At the same time, it is possible to prevent other people near the user from listening to the sound generated by the acoustic output device.

It should be noted that in some embodiments, the first acoustic driver and the second acoustic driver may be the same or similar acoustic drivers, so that the frequency response of the first acoustic driver and the frequency response of 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 response of the first acoustic driver and the frequency response of the second acoustic driver may be the same or similar in the mid-high frequency band, while the frequency response of the first acoustic driver and the frequency response of the second acoustic driver may be different in the low frequency band. Detailed descriptions of the first acoustic driver and the second acoustic driver may be referred to in FIGS. 3, fig. 4 and their descriptions. In some alternative embodiments, the sound generated by the vibration of the first/second diaphragm may also refer to the sound generated by the reverse side of the first/second acoustic driver, and it is only necessary to ensure that the acoustic impedances of the two acoustic drivers and their respective sound guide holes are the same, or, basically the same.

In FIG. 3 is a block diagram of an exemplary acoustic output device in accordance with some embodiments of the present disclosure. As shown in FIG. 3, acoustic output device 300 may include a signal processing module 310 and an output module 320.

The signal processing module 310 may include a control circuit 311 . The control circuit 311 may be configured to receive the original acoustic signal, process the original acoustic signal, and output a corresponding control signal (also referred to as an audio signal), that is, sound waveforming control and signal output. In some embodiments, the original acoustic signal may be an electrical signal converted from environmental sound by one or more electro-acoustic conversion devices (eg, a microphone). For example, acoustic output device 300 may include one or more air or bone conduction microphones to collect and convert air vibration or any other perceived mechanical vibration into electrical signals and send electrical signals to signal processing module 310. In some embodiments, the implementation of the acoustic output device may receive the original acoustic signal from one or more signal sources. One or more signal sources may be an internal device (eg, memory) of the acoustic output device 300 or an external device of the acoustic output device 300. The external device may send a signal containing audio information to the acoustic output device 300 in a wired or wireless manner.

The output module 320 may include one or more electro-acoustic conversion devices (ie, an acoustic driver). The acoustic driver in the output module 320 may be electrically connected to the control circuit 311 and configured to generate sound waves in response to the control signal. In some embodiments, the output module 320 may comprise a first acoustic driver 321 and a second acoustic driver 322. The control signal may comprise a first electrical signal and a second electrical signal, wherein the first electrical signal may be configured to drive the first acoustic driver 321 to produce sound, and the second electrical signal may be configured to drive a second acoustic driver 322 to produce sound. Specifically, the first acoustic driver 321 may include a first diaphragm and a first magnetic circuit structure, and the second acoustic driver 322 may include a second diaphragm and a second magnetic circuit structure, wherein the first electrical signal may vibrate the first diaphragm and the second electrical signal may vibrate the second diaphragm. .

In some embodiments, the phase of the first electrical signal and the phase of the second electrical signal may be opposite. When the first diaphragm is driven by the first electrical signal to vibrate in the direction of the first magnetic circuit structure, the second diaphragm is driven by the second electrical signal to vibrate in the direction away from the second magnetic circuit structure, so that the phase of the sound generated by the first acoustic driver 321 and the phase of the sound generated by the second acoustic driver 322 may be opposite.

In some embodiments, the first acoustic driver 321 and the second acoustic driver 322 may be electrically coupled to the control circuit 311 with opposite polarities, respectively. In this case, the first acoustic driver 321 and the second acoustic driver 322 may be connected in parallel and then connected in series with the control circuit 311. For ease of understanding, the opposite polarities can be described as that the positive pole of the first acoustic driver 321 is connected to the output terminal of the control circuit 311, and the negative pole of the second acoustic driver 322 is connected to the output terminal of the control circuit 311. The control circuit 311 may generate a set of audio signals. When audio signals are transmitted to the input terminals of the two acoustic drivers, respectively (i.e., the positive pole of the first acoustic driver 321 and the negative pole of the second acoustic driver), the two acoustic drivers can receive a first electrical signal and a second electrical signal, respectively, with opposite polarities. In some alternative embodiments, the first acoustic driver 321 and the second acoustic driver 322 may be electrically connected by signal processing module 310 in the same polarity, respectively. In order to cause the two acoustic drivers to generate two sets of sounds with opposite phases, the signal processing module 310 may output two sets of audio signals with opposite phases. Specifically, between the control circuit 311 and the first acoustic driver 321 or the second acoustic driver 322, a phase inverter circuit may be added. The phase inverter circuit can be configured to invert the phase of the audio signal by 180°. In this case, the audio signal generated by the control circuit 311 can be transmitted to the first acoustic driver 321 and the second acoustic driver 322 in positive phase and negative phase, respectively, so that the two acoustic drivers can receive the first electrical signal and the second electrical signal with opposite polarities, respectively. .

In some embodiments, acoustic output device 300 may also include a housing. The housing may house a first acoustic driver 321 and a second acoustic driver 322. The housing may be provided with at least one first sonic guide hole and at least one second sonic guide hole. The sound generated by vibration of the first diaphragm of the first acoustic driver 321 may be radiated to the outside through at least one first sound guide hole. The sound generated by the vibration of the second diaphragm of the second acoustic driver 322 may be radiated outwardly through at least one second sound guide hole. The first sound guide hole and the second sound guide hole may be located in the front cavity of the first acoustic driver 321 and the front cavity of the second acoustic driver 322, respectively. The first sound guide hole and the second sound guide hole may be located in the rear cavity of the first acoustic driver 321 and the rear cavity of the second acoustic driver 322, respectively. Since the phases of the first electrical signal and the second electrical signal are opposite, and the phases of the sound emitted from the first sonic guide hole and the sound emitted from the second sonic guide hole are opposite, the sound emitted from the first sonic guide hole and the sound emitted from the second sonic guide hole, may be offset from each other in the far field (e.g., away from the user's ear), which may reduce the volume of the leakage sound of the acoustic output device 300.

The acoustic driver may be an element that can receive an electrical signal and convert the electrical signal into an audio signal for output. In some embodiments, the first acoustic driver 321 and/or the second acoustic driver 322 may be a speaker that can output air control sound waves. In other alternative embodiments, the first acoustic driver 321 and/or the second acoustic driver 322 may also be a speaker that can output sound waves due to the conduction of a solid medium (eg, sound waves propagated by bone conduction). In some embodiments, according to the frequency of the output sound, the types of acoustic drivers may include low frequency (for example, 20 Hz - 200 Hz) acoustic driver, mid-frequency (for example, 200 Hz - 8 kHz) acoustic driver, high frequency (for example, more than 8 kHz ) acoustic exciter or any combination thereof. Of course, the low and high frequency ranges can only represent an approximate range of frequencies. In different application scenarios, different ways of dividing by ranges are possible. For example, a crossover point may be specified, a low frequency may represent a frequency below the crossover point, and a high frequency may represent a frequency above the crossover point. The crossover point can be any value within the audio range of human ears, such as 500 Hz, 600 Hz, 700 Hz, 800 Hz, 1000 Hz, and so on. In some embodiments, according to the principle, the acoustic driver may include, but is not limited to, a moving coil driver, an electromagnetic driver, a piezoelectric driver, an electrostatic driver, a magnetostrictive driver, and the like. In some embodiments, the first acoustic driver 321 and the second acoustic driver 322 may be the same acoustic drivers. For example, the first acoustic driver 321 and the second acoustic driver 322 may be the same model of acoustic drivers manufactured by the same manufacturer. As another example, the first acoustic driver 321 and the second acoustic driver 322 may be both mid-tweeters and may have the same frequency response in the mid-high frequency band. In this case, since the phases of the first electrical signal and the second electrical signal are opposite, the phases of the sounds output from the front sides (or rear sides) of the first acoustic driver 321 and the second acoustic driver 322 may be opposite. In this case, the sound waves generated by the front sides of the first acoustic driver 321 and the second acoustic driver 322 can be radiated to the outside through the respective sound guide holes (for example, the first sound guide hole and the second sound guide hole) and the sound emitted by the respective sound guide holes, can be regarded as sound from two point sound sources. The two point sound sources can generate mid-high frequency sound with opposite phases, which can be inversely shifted in the far field, and the volume of leakage sound in the far-field mid-high frequency band can be reduced. In some embodiments, to prevent distortion of the low frequency sound emitted by the low frequency acoustic driver of the acoustic output device, the physical size of the low frequency acoustic driver may be larger than the physical size of the mid-high frequency acoustic driver. It should be understood that the diaphragm area of the low frequency acoustic driver may be larger than the diaphragm area of the mid-high frequency acoustic driver. It should be noted that the area of the diaphragm may refer to the effective area of the diaphragm during the vibration process. In other embodiments, the output effect of the low frequency acoustic driver at low frequency can be achieved by changing the structure of the diaphragm or the material of the diaphragm.

In some embodiments, to make the acoustic output suitable for more scenarios, the first acoustic driver 321 and the second acoustic driver 322 may be different acoustic drivers. For example, the first acoustic driver 321 and the second acoustic driver 322 may have different frequency responses in the low-frequency band, while in the mid-high frequency band, the first acoustic driver 321 and the second acoustic driver 322 may have the same or similar frequency responses. In the mid-high band, since the amplitude-frequency characteristics of the first acoustic driver 321 and the second acoustic driver 322 are basically the same, a two-point sound source with opposite phases in the mid-high band can be constructed in accordance with the first electrical signal and the second electrical signal. frequencies to reduce the volume of leakage sound in the mid-high frequency band in the far field. In the low frequency band, since the amplitude-frequency characteristics of the first acoustic driver 321 and the second acoustic driver 322 are different or have significant differences controlled by the first electrical signal and the second electrical signal, although the phases of the low-frequency sounds generated by the first acoustic driver 321 and the second acoustic driver 322, are opposite, the intensities of the low frequency sounds produced by the first acoustic driver 321 and the second acoustic driver 322 are very different. Therefore, the sound shifting effect may be weak and the loud low frequency sound in the near field may still be heard by the user's ear.

In some scenarios, signal processing module 310 310 may comprise a filter/filter bank (also referred to as a filter system). The filter/filter bank may adaptively change the first electrical signal and/or the second electrical signal applied to the first acoustic driver 321 and/or the second acoustic driver 322 according to the actual situation. For example, the filter/filter bank may filter out the low frequency signal in the first electrical signal so that the first acoustic driver 321 can only output audio in the mid-high frequency band. In this case, since the low frequency sound generated by the second acoustic driver 322 based on the second electrical signal cannot be displaced in the user's ear, the acoustic output effect of the low band acoustic output device can be improved.

In some embodiments, to improve the acoustic output effect of the acoustic output device in the low frequency band, the output module 320 may also include a third acoustic driver 323. The third acoustic driver 323 may include a third diaphragm. The third diaphragm can be excited for vibration by a third electrical signal. In some embodiments, the third acoustic driver 323 may be a low frequency acoustic driver. The filter/filter bank can filter out the mid-high frequency in the control signal and send the remaining low frequency signal to the third acoustic driver 323. Thus, the third acoustic driver 323 can only output low-frequency band audio, which can improve the acoustic output effect of the acoustic output device 300 in low frequency band. In some embodiments, in order to cause the acoustic output device to have a better acoustic output effect in a high noise environment, the third acoustic driver 323 may output audio having the same phase or a certain phase difference (e.g., the absolute value of the phase difference is less than 90°) of the sound, generated by the first acoustic driver 321 or the second acoustic driver 322. In this case, the low-frequency or mid-high frequency sound output from the third acoustic driver 323 can be used as compensation for the low-frequency or mid-high frequency sound heard by the user, making it easier for the user to listen to the sound, emitted by an acoustic output device in a noisy environment.

In some embodiments, the control circuit 311 may also include a switch to control the switching state of the filter/filter bank, the phase inverter circuit, and/or the acoustic driver. The switch can control the acoustic output device to adjust the sound according to different scenarios. For example, in a noisy environment, far-field audio leakage can be difficult to hear for those near the user. When the first acoustic driver 321 and the second acoustic driver 322 are both mid-high frequency acoustic drivers, the phases of the first electrical signal and the second electrical signal can be adjusted to become the same by turning off the phase inverter circuit. Thus, the first acoustic driver 321 and the second acoustic driver 322 can generate and output sound with the same phase in the mid-high band, and the output volume of the acoustic output device in the mid-high band can be increased. As another example, in a high noise environment where the first acoustic driver 321 and the second acoustic driver 322 are mid-high frequency acoustic drivers and the third acoustic driver 323 is a low frequency acoustic driver, a filter/filter bank electrically coupled to the low frequency acoustic driver may be turned off so that the low-frequency acoustic driver can also generate mid-high sound waves in accordance with the control signal, and the volume of the mid-high band sound output by the acoustic output device can be increased. In other embodiments, frequency separation may be performed on a control signal (eg, a third electrical signal) to control the third acoustic driver 323, driving the filter/filter bank of the third acoustic driver 323. The signal processing module 310 may adjust the phase of the low frequency signal obtained after the frequency separation. so that the phase of the low-frequency sound wave generated by the third acoustic driver 323 is opposite to the low-frequency noise in the external noise, so as to realize the effect of active low-frequency noise reduction. In addition, the mid-high frequency signal obtained after the frequency separation can cause the third acoustic driver 323 to produce a mid-high frequency sound. The mid-high frequency sound may have the same phase or have a small phase difference (for example, no more than 90°) with the mid-high frequency sound generated by the first acoustic driver 321 and the second acoustic driver 322 to achieve the noise reduction effect in the low frequency band. and the effect of increasing the output volume in the high-frequency band at the same time.

In some embodiments, in order to adjust the output characteristics (e.g., frequency, phase, amplitude, etc.) of the sound wave, the respective control signal may be processed in the signal processing module 310 such that the sound wave output by each acoustic driver accordingly contains a certain frequency component. The structure or arrangement of each component in the output module 320 can be set and optimized so that the sound wave output from each acoustic driver contains a certain frequency component accordingly. When the characteristics of the output sound wave are changed by adjusting the signal processing unit 310, several filters/filter groups can be set to process the control signal to output signals containing different frequency components, and then output the signals to the corresponding output unit 320 for audio output. Filters/filter groups may include, but are not limited to, an analog filter, a digital filter, a passive filter, an active filter, and the like.

It should be noted that in some embodiments of the present disclosure, low frequency may refer to a frequency band between approximately 20 Hz and 200 Hz, and mid-high frequency may refer to a frequency band between approximately 200 Hz and 20 kHz. Preferably, the mid-high frequency may refer to a frequency band between approximately 400 Hz and 10 kHz. More preferably, the mid-high frequency may refer to a frequency band between approximately 600 Hz and 8 kHz. In other embodiments, the frequency band may also be divided into a low frequency band, a mid-low frequency band, a medium frequency band, a mid-high frequency band, a high frequency band, and the like. One skilled in the art will appreciate that the above frequency band divisions are provided by way of example only, to give an approximate spacing. The definition of a frequency band may change in different industries, in different application scenarios, or in different classification standards. For example, in other application scenarios, low frequency may refer to a frequency band between approximately 20 Hz and 80 Hz, medium low frequency may refer to a frequency band between approximately 80 Hz and 160 Hz, mid frequency may refer to a frequency band between approximately 160 Hz and 2 kHz, mid-high frequency may refer to a frequency band between approximately 2 kHz and 8 kHz, and high frequency may refer to a frequency band between approximately 8 kHz and 20 kHz. For additional descriptions of the specific structure and distribution of the first acoustic driver 321, the second acoustic driver 322, the third acoustic driver 323, and their components, refer to FIG. 1, fig. 4 and their descriptions.

In FIG. 4 is a block diagram showing an exemplary acoustic output device in accordance with some embodiments of the present disclosure. As shown in FIG. 4, the acoustic output device 400 may include an internally hollow housing 410, a first acoustic driver 420, and a second acoustic driver 430 located within the housing 410.

In some embodiments, the acoustic output device 400 may be worn on the user's body (e.g., the head, neck, or upper torso) by means of the housing 410. The housing 410, the first acoustic driver 420, and the second acoustic driver 430 may be close to, but not cover, the outer ear canal so that the user's ear remains open and the user can hear not only the sound output from the acoustic output device 400, but also environmental sounds. For example, acoustic output device 400 may be positioned around or partially around the user's ear and may transmit sound via air conduction or bone conduction.

The housing 410 may be used to be worn on a user's body and may contain an acoustic driver (eg, a first acoustic driver 420 and a second acoustic driver 430) within. In some embodiments, the housing 410 may be a closed housing design with a hollow interior and the acoustic driver may be located within the housing 410. In some embodiments, the acoustic output device 400 may be combined with an item such as glasses, headset, head-mounted display, AR helmet /VR etc. In this case, the housing 410 may be attached near the user's ear by hanging or clipping. In some alternative embodiments, the housing 410 may be provided with a hook. The shape of the hook may conform to the shape of the pinna so that the acoustic output device 400 can be independently worn on the user's ear using the hook. The acoustic output device 400, which is independently worn by the wearer, can be connected to a signal source (eg, computer, mobile phone, or other mobile devices) in a wired or wireless (eg, Bluetooth) manner. For example, acoustic output devices 400 on the left ear and on the right ear can both directly connect and communicate wirelessly with the signal source. As another example, left ear and right ear acoustic output devices 400 may comprise a first output device and a second output device, wherein the first output device may be connected to and communicate with a signal source, and the second output device may be wirelessly connected to the first output device. way. The first output device and the second output device may implement audio playback timing via one or more timing signals. The wireless connection 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.

In some embodiments, the housing 410 may have a housing structure having a shape adapted to the human ear, such as a ring shape, an oval shape, a polygonal shape (regular or irregular), a U-shape, a V-shape, a semi-circular shape, such so that the body 410 can be directly attached to the user's ear. In some embodiments, the housing 410 may also include one or more mounting structures. The mounting structure may include a temple, a headpiece, or an elastic band so that the acoustic output device 400 can be better secured to the user and prevent the acoustic output device 400 from falling off while the user is using the acoustic output device 400. Just by way of example, an elastic band, for example, may be a bandanna. The bandana may be designed to be worn on the head. As another example, the elastic band may be a collar designed to be worn around the neck/shoulder area. In some embodiments, the elastic band may be a continuous band and elastically stretchable to conform to the size and shape of the wearer's head. At the same time, the elastic band can exert pressure on the user's head so that the acoustic output device 100 can be tightly fixed in a certain position on the user's head. In some embodiments, the elastic band may be a discontinuous band. For example, the tape may comprise a rigid portion and a flexible portion, the rigid portion being made from a hard material (eg, plastic or metal). The rigid part may be attached to the housing 410 of the acoustic output device 400 by a physical connection (eg, snap connection, screw connection, etc.). The flexible part may be made of an elastic material (eg fabric, composite material and/or neoprene).

In some embodiments, the acoustic driver (eg, first acoustic driver 420 and second acoustic driver 430) may comprise a diaphragm and a magnetic circuit structure. For a further description of the structures of the first acoustic driver 420 and the second acoustic driver 430, refer to FIG. 1 of the present disclosure and its description and details are not described here. When the acoustic driver diaphragm is driven to vibrate by a control signal (eg, a first electrical signal and a second electrical signal), sounds can be emitted from the front side and the rear side of the diaphragm, respectively. In some embodiments, the housing 410 may include a first cavity 411 and a second cavity 412, wherein the first cavity 411 may not be fluidly coupled to the second cavity 412, i.e., a baffle may be provided in the housing 410 to isolate the first cavity 411 from the second cavity 412. . In other embodiments, the housing 410 may include a first housing and a second housing. The first housing may be rigidly connected to the second housing. The first cavity 411 may be located in the first cavity 411, and the second cavity 412 may be located in the second cavity 412. The first acoustic driver 420 may be located in the first cavity 411. The front side of the first acoustic driver 420 and the housing 410 can form the first front cavity 4111 The reverse side of the first acoustic driver 420 and the housing structure 420 may form the first rear cavity 4112. The front side of the first acoustic driver 420 may emit sound towards the first front cavity 4111. The reverse side of the first acoustic driver 420 may emit sound towards the first rear cavity 4112. The second acoustic driver 430 may be located in the second cavity 412. The front side of the second acoustic driver 430 and the housing 410 may form the second front cavity 4121. The reverse side of the second acoustic driver 430 and the housing 410 may form the second rear cavity 4122. The front side of the second acoustic driver 430 may emit sound towards the second front cavity 4121. The reverse side of the second acoustic driver 430 may emit sound towards the second rear cavity 4122. In some embodiments, the first cavity 411 may be the same as the second cavity 412. First the acoustic driver 420 and the second acoustic driver 430 may be located in the first cavity 411 and the second cavity 412, respectively, in the same way, so the first front cavity 4111 is the same as the second front cavity 4121, and the first rear cavity 4112 is the same as the second rear cavity 4122, which can make the acoustic impedances of the front side or back side of the first acoustic driver 420 and the second acoustic driver 430 the same. In other embodiments, the first cavity 411 and the second cavity 412 may be different. The impedances of the front side or back side of the first acoustic driver 420 and the second acoustic driver 430 can be made the same by changing the size and/or length of the cavity or by increasing the attenuation. In some embodiments, one or more first sound guide holes 413 may be provided on the side wall of the housing 410 in which the first front cavity 4111 is located. One or more first sound guide holes 413 may be in fluid communication with the first front cavity 4111. Sound output from the front side of the first acoustic driver 420 may be radiated to the outside of the acoustic output device 400 through one or more first sound guide holes 413. The one or more second sound guide holes 414 may be fluidly connected to the second front cavity 4121. 414. In some embodiments, the first sound guide hole 413 and the second sound guide hole 414 may be located on opposite side walls of the housing 410. For example, the first sound guide hole 413 may be located on the side wall of the housing 410 facing the user's ear, and the second sound guide hole 414 may be located on the side wall of the housing 410 away from the user's ear. As another example, the first sound guide hole 413 may be located on the side wall of the housing 410 opposite the front side of the first acoustic driver 420, and the second sound guide hole 414 may be located on the side wall of the housing 410 opposite the front side of the second acoustic driver 430. In some embodiments, the acoustic output device 400 may not include a first front cavity 4111, a second front cavity 4121, a first rear cavity 4112, or a second rear cavity 4122. For example, the front side of the first acoustic driver 420 and the front side of the second acoustic driver 430 may radiate sound directly outward. . That is, the front side of the first acoustic driver 420 and housing 410 cannot form the first front cavity 4111, and the front side of the second acoustic driver 430 and housing 410 cannot form the second front cavity 4121. In some embodiments, the first rear cavity 4112 and the second rear cavity The 4122 may be sealed or may be provided with one or more adjustment holes (also called pressure relief holes, which are not shown in Figure 4) to control air pressure in the rear cavity.

In some embodiments, the first acoustic driver 420 and the second acoustic driver 430 may be the same acoustic drivers. The signal processing module may control the front side of the first acoustic driver 420 and the front side of the second acoustic driver 430 to generate sounds with a certain phase and amplitude relationship (for example, sounds with the same amplitude and opposite phases, sounds with different amplitudes and opposite phases, etc. .) in accordance with the control signal (for example, the first electrical signal and the second electrical signal). The sound generated by the front side of the first acoustic driver 420 may be radiated to the outside of the acoustic output device 400 through the first sound guide hole 413. The sound generated by the front side of the second acoustic driver 430 can be radiated to the outside of the acoustic output device 400 through the second sound guide hole 414. First the sound guide hole 413 and the second sound guide hole 414 may be equivalent to a two-point sound source outputting sounds with opposite phases. Unlike the case where a two-point sound source is generated by sounds emitted by the front side and back side of the acoustic driver, sounds with opposite phases can be generated by the front sides of two acoustic drivers, that is, the front side of the first acoustic driver 420 and the front side of the second acoustic driver 430, and radiate outwardly through the first sound guide hole 413 and the second sound guide hole 414. When the acoustic impedance from the first acoustic driver 420 to the first sound guide hole 413 is the same or approximately the same as the acoustic impedance from the second acoustic driver 430 to the second sound guide holes 414, the sounds emitted by the first sound guide hole 413 and the second sound guide hole 414 in the acoustic output device 400 can be produced as an effective two-point sound source, that is, the first The sound guide hole 413 and the second sound guide hole 414 can emit sounds with opposite phases more accurately. In the far field, especially in the mid-high frequency band (for example, 200 Hz - 20 kHz), the sound from the first sound guide hole 413 can shift the sound from the second sound guide hole 414 better, which can to some extent better suppress acoustic output sound leakage. devices in the mid-high frequency band. At the same time, it is possible to prevent others around the user from listening to the sound generated by the acoustic output device 400, thereby improving the sound leakage reduction effect of the acoustic output device 400.

Additionally, when the front side of the first acoustic driver 420 and the front side of the second acoustic driver 430 are located on different sides of the housing 410, the first sound guide hole 413 and the second sound guide hole 414 can also be located on different sides of the body 410, and the body 410 can act as a baffle. between two sound sources (for example, the sound emitted by the first sound guide hole 413 and the sound emitted by the second sound guide hole 414). In this case, the housing 410 may separate the first sound guide hole 413 and the second sound guide hole 414 so that the acoustic path from the first sound guide hole 413 to the user's external ear canal and the acoustic path from the second sound guide hole 414 to the user's external ear canal are different. . On the one hand, by positioning the first sound guide hole 413 and the second sound guide hole 414 on two sides of the body 410, the difference between the sound path emitted from the first sound guide hole 413 to the user's ear and the sound path emitted from the second sound guide hole 414, to the user's ear (that is, the difference between the distance traveled by the sound emitted from the first sound guide hole 413 to the user's external ear canal and the distance traveled by the sound emitted by the second sound guide hole 414 to the user's external ear canal) may increase. The sound shifting effect at the user's ear (ie, in the near field) can be reduced, thereby increasing the volume of the sound (also referred to as near field sound) heard by the user's ear and providing the user with a better listening experience. On the other hand, the housing 410 may have little effect on the sound transmitted by the sonic guide hole to the environment, the far-field sounds produced by the first sonic guide hole 413 and the second sonic guide hole 414 may still move appreciably relative to each other, which may suppress sound leakage of the acoustic output device 400 to a certain extent, and at the same time can prevent the sound generated by the acoustic output device 400 from being heard by others near the user. Therefore, by using the above settings, the listening volume of the near field acoustic output device 400 can be improved and the leakage sound volume of the far field acoustic output device 400 can be reduced.

In some embodiments, the sound output from the first acoustic driver 420 from the first sound guide hole 413 and the sound output from the second acoustic driver 430 from the second sound guide hole 414 can satisfy a certain condition by adjusting the structures of the first cavity 411 (e.g., the first front cavity 4111 and first rear cavity 4112) and second cavity 412 (eg, second front cavity 4121 and second rear cavity 4122). For example, the dimensions and/or lengths of the first front cavity 4111 and the second front cavity 4112 can be designed such that a set of sounds with a certain phase relationship (for example, opposite or approximately opposite phases) can be output from the first sound guide hole 413 and the second sound guide. holes 414, which can effectively solve the problems of low listening volume in the near field and sound leakage in the far field of the acoustic output device 400.

It should be noted that the positions of the first cavity 411 and the second cavity 412 in the embodiments of the present disclosure shown in FIGS. 4 are not limited to being vertically downward relative to the position of the user's ear, as shown in FIG. 4, but may also be up and down with respect to another position of the user's ear, i.e., transverse and horizontal to the position of the user's ear, transverse and oblique to the position of the user's ear, and the like. The positions of the first cavity 411, the second cavity 412, the first acoustic driver 420, and the second acoustic driver 430 can be adaptively adjusted according to the actual situation, which is not limited here.

In FIG. 5 depicts the frequency response of an acoustic output device when two acoustic output device drivers are the same, in accordance with some embodiments of the present disclosure. In combination with FIG. 4 and FIG. 5, when an acoustic output device is provided with two identical first acoustic drivers 420 ("Speaker A" in FIG. 5) and second acoustic drivers 430 ("Speaker B" in FIG. 5), the frequency responses of the first acoustic driver 420 and the second acoustic driver driver 430 in the mid-high band (eg, 200 Hz - 8 kHz) and in the high band (eg, greater than 8 kHz) may be approximately the same. The first acoustic driver 420 and the second acoustic driver 430 can emit sounds in opposite phases through the first sound guide hole 413 and the second sound guide hole 414 under the control of the first electrical signal and the second electrical signal in opposite phases, so that the acoustic output device can create an efficient two-point source. sound in the mid-high frequency band and in the high frequency band. In some embodiments, in order to ensure that the sounds radiated by the first acoustic driver and the second acoustic driver through their respective sound guide holes form an effective two-point sound source, the difference between the frequency responses of the first acoustic driver and the second acoustic driver in the mid-high frequency band and in the high-frequency band can be no more than 6 dB. Preferably, the difference between the amplitude-frequency characteristics of the first acoustic driver and the second acoustic driver in the mid-high frequency band and in the high frequency band can be no more than 5 dB. More preferably, the difference between the frequency responses of the first acoustic driver and the second acoustic driver in the mid-high frequency band and in the high frequency band may be no more than 4 dB. Additionally, preferably, the difference between the amplitude-frequency characteristics of the first acoustic exciter and the second acoustic exciter in the mid-high frequency band and in the high frequency band can be no more than 3 dB. In some embodiments, the implementation of the mid-high frequency band and the high frequency band may be in a certain range of the frequency band. A certain frequency band range can be 200 Hz - 20 kHz.

In FIG. 6 shows the frequency response of an acoustic output device when two acoustic drivers of an acoustic output device are different, in accordance with some embodiments of the present disclosure. As shown in FIG. 6, when the acoustic output device is provided with two different first acoustic drivers 420 ("speaker A" in FIG. 6) and a second acoustic driver 430 ("speaker B" in FIG. 6), the frequency responses of the first acoustic driver 420 and the second acoustic driver of the driver 430 in the low-frequency band (for example, 100 Hz - 200 Hz) may have a certain difference, the amplitude-frequency characteristics of the first acoustic driver 420 and the second acoustic driver 430 in the mid-high frequency band and in the high frequency band may be approximately the same.

Assuming that the sound waves with opposite phases emitted by the first acoustic driver 420 and the second acoustic driver 430 in the low frequency band can be shifted relative to each other in order to improve the acoustic output effect of the acoustic output device in the low frequency range (especially the output loudness at low frequency of the acoustic output device in the near field), in some embodiments, the difference between the amplitude-frequency characteristics of the first acoustic exciter and the second acoustic exciter in at least part of the low frequency range (for example, 100 Hz - 200 Hz) can be at least 10 dB, so the output volumes of the two acoustic exciters in the low-frequency range have significant differences. Preferably, the difference between the amplitude-frequency characteristics of the first acoustic driver and the second acoustic driver, at least in part of the low frequency range, may be at least 15 dB. Additionally, preferably, the difference between the amplitude-frequency characteristics of the first acoustic driver and the second acoustic driver, at least in part of the low frequency range, may be at least 20 dB. In some embodiments, when the user is wearing the acoustic output device, the acoustic path from the first acoustic driver 420 to the user's ear may be less than the acoustic path from the second acoustic driver 430 to the user's ear. Therefore, the loudness difference between the low frequency sound emitted from the first acoustic driver 420 and the low frequency sound emitted from the second acoustic driver 430 may further increase at the user's ear. The degree of displacement of low frequency sounds may be reduced and the listening volume of low frequency sounds at the user's ear may be increased. In some embodiments, the acoustic path from the acoustic driver to the user's ear may be referred to as the distance from the diaphragm to the user's ear, for example, the distance from the first diaphragm of the first acoustic driver 420 to the user's ear. In other embodiments, the acoustic path from the acoustic driver to the user's ear may refer to the acoustic distance from the sound guide hole corresponding to the acoustic driver to the user's ear, for example, the acoustic distance from the first sound guide hole 413, corresponding to the first acoustic driver 420, to the user's ear. .

In the mid-high frequency band and in the high frequency band, the first acoustic driver 420 and the second acoustic driver 430 can emit sounds with opposite phases and the same or similar amplitudes through the first sound guide hole 413 and the second sound guide hole 414 when excited by the first electrical signal and the second electrical signal. signal in opposite phases, which can allow the acoustic output device to create an efficient two-point sound source in the mid-high frequency band and in the high frequency band. In some embodiments, in order to ensure that the sounds radiated by the first acoustic driver and the second acoustic driver through the respective sound guide holes can form an effective two-point sound source in the mid-high frequency band and in the high frequency band, the difference between the amplitude-frequency characteristics of the first acoustic of the exciter and the second acoustic exciter in the medium-high frequency band and in the high-frequency band can be no more than 6 dB. Preferably, the difference between the amplitude-frequency characteristics of the first acoustic driver and the second acoustic driver in the mid-high frequency band and in the high frequency band can be no more than 5 dB. More preferably, the difference between the frequency responses of the first acoustic driver and the second acoustic driver in the mid-high frequency band and in the high frequency band may be no more than 4 dB. Further preferably, the difference between the amplitude-frequency characteristics of the first acoustic driver and the second acoustic driver in the mid-high frequency band and in the high frequency band can be no more than 3 dB. In some embodiments, the implementation of the mid-high frequency band and the high frequency band may be in a certain range of the frequency band. The defined bandwidth range can be 200 Hz - 20 kHz.

In FIG. 7 and FIG. 8 are block diagrams of an acoustic output device in accordance with some embodiments of the present disclosure. As shown in FIG. 7 and FIG. 8, in some embodiments, the acoustic output device 700 may include a first acoustic driver 720, a second acoustic driver 730, a third acoustic driver 740, and a housing 710. The interior of the housing 710 may have a first cavity 711, a second cavity 712, and a third cavity 713 that are not are in fluid communication with each other, wherein the first acoustic driver 720 may be located in the first cavity 711, the second acoustic driver 730 may be located in the second cavity 712, and the third acoustic driver 740 may be located in the third cavity 713. driver 720 and housing 710 may form a first front cavity 7111. The reverse side of the first acoustic driver 720 and housing 720 may form a first rear cavity 7112. The front side of the first acoustic driver 720 may emit sound towards the first front cavity 7111. The reverse side of the first acoustic The acoustic driver 720 may radiate sound towards the first rear cavity 7112. The front side of the second acoustic driver 730 and housing 710 may form the second front cavity 7121. The reverse side of the second acoustic driver 730 and housing 710 may form the second rear cavity 7122. The front side of the second acoustic driver 730 may emit sound towards the second front cavity 7121. The reverse side of the second acoustic driver 730 may emit sound towards the second rear cavity 7122. The front side of the third acoustic driver 740 and housing 710 may form the third front cavity 7131. The reverse side of the third acoustic driver 740 and body 710 may form a third rear cavity 7132. The front side of the third acoustic driver 730 may emit sound towards the third front cavity 7131. The reverse side of the third acoustic driver 740 may emit sound towards the a third rear cavity 7122. In some embodiments, one or more first sonic guide holes 714 may be provided on the side wall of the housing 710 where the first front cavity 7111 is located. One or more first fluid sonic guide holes 714 may be connected to the first front cavity 7111 The sound output from the front side of the first acoustic driver 720 may be radiated to the outside of the acoustic output device 700 through one or more first sound guide holes 714. One or more second sound guide holes 715 may be provided on the side wall of the housing 710 where the second front cavity is located. 7121. One or more second sound guide holes 715 may be in fluid communication with the second front cavity 712. sonic guide holes 715. In some embodiments, the first sonic guide hole 714 and the second sonic guide hole 715 may be located on different side walls of the housing 710. For example, the first sonic guide hole 714 and the second sonic guide hole 715 may be located on adjacent side walls body 710, respectively. As another example, the first sound guide hole 714 and the second sound guide hole 715 may be located on the walls of the opposite side walls of the housing 710, respectively. One or more third sound guide holes 716 may be provided on the side wall of the housing 710 where the third front cavity 7131 is located. One or more third sound guide holes 715 are fluidly connected to the third front cavity 7131. 740 may be radiated to the outside of the acoustic output device 700 through one or more third sound guide holes 716. One or more fourth sound guide holes 717 may be provided on the side wall of the housing 710 where the third rear cavity 7132 is located. One or more fourth sound guide holes 717 may be fluidly coupled to fourth rear cavity 7132. Sound output from the back of third acoustic driver 740 may be radiated to the outside of acoustic output device 700 through one or more fourth sound guide holes 717. In some embodiments, In embodiments, third sonic guide hole 716 and fourth sonic guide hole 717 may be located on different side walls of housing 710. For example, third sonic guide hole 716 and fourth sonic guide hole 717 may be located on adjacent side walls of housing 710, respectively. As another example, the third sound guide hole 716 and the fourth sound guide hole 717 may be located on opposite side walls of the housing 710, respectively.

In some embodiments, the first acoustic driver 720 and the second acoustic driver 730 may be mid-high frequency acoustic drivers, and the third acoustic driver 740 may be a low frequency acoustic driver. The first acoustic driver 720 and the second acoustic driver 730 may emit sound waves with opposite phases under the control of the first electrical signal and the second electrical signal with opposite phases. The third acoustic driver 740 may filter mid-high frequency components in the first electrical signal or the second electrical signal through the filter/filter bank, and output only low frequency sound. Additionally, the third acoustic driver 730 can output sound waves in opposite phases through the third sound guide hole 716 and the fourth sound guide hole 717. For purposes of illustration, when the user wears the acoustic output device 700 on himself, the first sound guide holes 714 and the third sound guide holes the holes 716 may face the user's ear, the second sound guide hole 715 may face the user's ear or away from the user's ear, and the fourth sound guide hole 717 may face away from the user's ear. In some embodiments, the phase of the sound emitted by one of the third sound guide hole 716 or the fourth sound guide hole 717, which is closer to the user's ear, may be the same as the phase of the sound emitted by one of the first sound guide hole 714 or the second sound guide hole. hole 715 which is closer to the user's ear. It should be noted that the phases of sounds emitted by different sound guide holes close to the user's ear may be the same, so sounds emitted by different sound guide holes may overlap, thus increasing the listening volume of the user's ear. At a position (for example, in the far field) away from the user's ear, sound waves emitted from different sound guide holes (for example, the first sound guide hole 714 and the second sound guide hole 715, the third sound guide hole 716 and the fourth sound guide hole 717 ) can move relative to each other due to their opposite phases, thus reducing the loudness of the leakage sound of the acoustic output device in the far field. In some embodiments, by establishing a first cavity structure 711 (e.g., first anterior cavity 7111 and first posterior cavity 7112)/second cavity 712 (e.g., second anterior cavity 7121 and second posterior cavity 7122) and a third cavity structure 713 (e.g., third anterior cavity 7131 and the third rear cavity 7132), the sound output by the acoustic driver 720 from the first sound guide hole 714, the sound output by the second acoustic driver 730 from the second acoustic guide hole 715, or the sound output by the third acoustic driver 740 from the third sound guide hole 716 or the fourth sound guide hole 717 may satisfy a certain condition. For example, the dimensions and/or lengths of the first front cavity 4111 and the third front cavity 7131 can be designed such that a group of sounds with the same phase can be output from the first sound guide hole 413 and the second sound guide hole 414.

In some embodiments, since the wavelength of the sound in the low band is longer than the wavelength of the sound in the mid-high band or the high band, to reduce the degree of displacement of the sounds emitted by the third acoustic driver 740 from the third sound guide hole 716 and the fourth sound guide hole 717 in the vicinity of the user's ear, the sound path difference between the sound emitted by the third sound guide hole 716 to the user's ear and the sound emitted by the fourth sound guide hole 717 to the user's ear may be larger than the sound path difference emitted by the first sound guide hole 716 guide hole 714 to the user's ear, and the sound emitted by the second sound guide hole 715 to the user's ear.

In some embodiments, the acoustic output device 700 shown in FIG. 7 and FIG. 8, can not only reduce the volume of leakage sound in the far-field mid-high band and improve the listening effect of low-frequency band sound, but can also be applied in a high-noise environment. Just for example, in a noisy environment, far-field sound leakage may be difficult to hear by others near the user when the first acoustic driver 720 and the second acoustic driver 730 are both mid-high frequency acoustic drivers, the phases of the first electrical signal and the second the electrical signal can be adjusted to be the same by closing the phase inverter circuit so that the phase of the mid-high frequency sound output from the first acoustic driver 720 through the first sound guide hole 714 is the same as the phase of the mid-high frequency sound output from the second acoustic driver 730 through the second sound guide hole 715, thereby improving the output loudness of the acoustic output device in the mid-high frequency band. As another example, in a high noise environment where the first acoustic driver 720 and the second acoustic driver 730 are mid-high frequency acoustic drivers and the third acoustic driver 740 is a low frequency acoustic driver, the filter/filter bank electrically coupled to the third acoustic driver 730 , may be turned off so that the third acoustic driver 730 may also generate a sound wave in the mid-high frequency band in accordance with the control signal. The sound wave may be emitted back and forth from the user's ear through the third sound guide hole 716 and the fourth sound guide hole 717, which can increase the volume of the mid-high band sound output from the acoustic output device. In other embodiments, by controlling the filter/filter bank of the third acoustic driver 740, frequency division may be performed on a control signal (eg, on a third electrical signal) to control the third acoustic driver 740. The signal processing module may adjust the phase of the low frequency signal obtained after frequency division so that the low-frequency sound wave generated by the third acoustic driver 740 is radiated outward through the third sound guide hole 716 and the fourth sound guide hole 717. , can be opposite to the phase of the low-frequency noise in the external noise, which can achieve the effect of active low-frequency noise reduction. In addition, the mid-high frequency signal obtained after the frequency division can cause the third acoustic driver 740 to produce a mid-high frequency sound. The mid-high frequency sound may have the same phase or have a small phase shift (for example, no more than 90°) relative to the mid-high frequency sound generated by the first acoustic driver 720 and the second acoustic driver 730 in order to simultaneously achieve a noise reduction effect in the low frequency band and the effect of increasing the output volume in the high-frequency band.

It should be noted that the number of acoustic drivers is not limited to three, but may be four, five, or the like. The number of acoustic drivers and the corresponding audio parameters (eg, phase, frequency and/or amplitude) can be adjusted according to the actual need, which is not limited here. The specific structure of the acoustic driver may be as shown in FIG. 1 of this disclosure and its descriptions. The first/second/third acoustic drivers described in FIG. 7 and FIG. 8 may be the same or similar to the first/second/third acoustic drivers shown in FIG. 3, fig. 4 and described in their disclosures.

The basic concepts thus described may become reasonably apparent to those skilled in the art upon reading the present detailed disclosure, the foregoing detailed disclosure being intended to be by way of example only and not limitation. Various changes, improvements and modifications may take place and are intended for those skilled in the art, although this is not expressly expressed here. These changes, improvements, and modifications are intended to be suggested by the present disclosure and are within 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 "some 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 embodiment" or "alternative embodiment" in various parts of this specification are not necessarily referred to as all referring to the same embodiment. Additionally, certain features, structures, or characteristics may be combined as useful in one or more embodiments of the present disclosure.

In addition, those skilled in the art should understand that the various approaches of the present disclosure may be elucidated and described in terms of several patentable categories or situations, including any new and useful processes, machines, products, or combinations of materials, or any new and useful improvements. Accordingly, all aspects of the present disclosure may be implemented entirely in hardware, may be implemented entirely in software (including firmware, resident software, microcode, etc.), or may be implemented in a combination of hardware and software. The above hardware or software may be referred to as a "data block", "module", "machine", "unit", "component", or "system". In addition, the approaches of the present disclosure may be presented as a computer product located on one or more computer-readable media, a product incorporating computer-readable program code.

The computer storage medium may comprise a data distribution signal containing computer program coding, such as baseband coding or as part of a carrier. The propagation signal may be in a variety of representations, including electromagnetic form, optical form, etc., or suitable combinations. The storage media may be any computer-readable media, other than computer-readable media, that can be executed by a system, device, or devices to implement a system, devices, or devices for communicating, distributing, or device by connecting to a command. The coding of the program on the storage medium may be distributed by any suitable medium, including radio, cable, optical cable, RF signal, or similar medium, or a combination of the aforementioned media.

A computer control program for performing the operations of the approaches of the present disclosure may be written in any combination of one or more programming languages, including an object-oriented programming language such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB. NET, Python, etc., standard procedural programming languages such as C programming language, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, ABAP, dynamic programming languages such as Python, Ruby and Groovy or other programming languages. The control program may run wholly on the user's computer, or as an independent software package on the user's computer, or partly on the user's computer and partly on a remote computer, or wholly on a remote computer or server. In the latter case, the remote computer can connect to the user's computer through any network form, such as a local area network (LAN) or a wide area network (WAN), or to an external computer (for example, via the Internet), or work in a cloud computing environment or as a service such as Software as a Service (SaaS).

In addition, unless explicitly stated in the claims, the order in which elements and sequences are processed, the use of numbers and letters, or the use of other names in this disclosure is not intended to limit the order of procedures and methods of this disclosure. Although the above disclosure is discussed through various examples, which are now considered to be a variety of useful embodiments of the disclosure, it should be understood that such detail is for this purpose only and that the appended claims are not limited to the disclosed embodiments, but rather are intended to cover modifications and equivalent structures that are within the spirit and protection scope of the disclosed embodiments. For example, while the various components described above may be implemented in a hardware device, they may also be implemented only as a software solution, such as by installation on an existing server or mobile device.

Likewise, it should be understood that in the above description of embodiments of the present disclosure, various features are sometimes grouped together in a single embodiment, drawing, or description for the purpose of optimizing the disclosure's assistance in understanding one or more of the various embodiments. However, this disclosure does not mean that the present subject matter of the disclosure requires more features than those mentioned in the claims. Rather, the desired object may be found in less than all of the features of a single prior disclosed embodiment.

In some embodiments, numbers expressing quantities of components, properties, etc. used to describe and claim certain embodiments of the application are to be understood as being modified in some instances by the terms "about", "approximately", or "substantially" . Unless otherwise stated, "about", "approximately", or "substantially" may indicate a change of ±20% from the value being described. Accordingly, in some embodiments, the numerical parameters given in the description and the appended claims are approximations that may vary depending on the desired properties in order to obtain them in a particular embodiment. In some embodiments, the implementation of the numerical parameters should consider certain significant figures and apply the usual methods of rounding. Although the numerical ranges and parameters configured for the broad scope of some embodiments of the present disclosure are approximations, the numerical values in specific examples may be as accurate as possible within practical application.

The contents of each of the patents, patent applications, patent application publications, and other materials such as articles, books, descriptions, publications, documents, etc., to which reference is made herein, are hereby incorporated herein by reference, to the exclusion of any archival court a file that is incompatible or contrary to this document, or any file (currently or later associated with this disclosure) that may have a limiting effect on the broadest scope of protection of the claims. It should be noted that if the description, definition and/or terms used in the appendices of this disclosure are inconsistent or contrary to the content described in this disclosure, the use of the description, definition and/or terms of this disclosure shall prevail.

Finally, it should be understood that the embodiments described in the present disclosure merely show the operating principles of the embodiments of the present disclosure. Other modifications may be within the scope of this disclosure. Accordingly, for example, but not by way of limitation, alternative configurations of embodiments of the present disclosure may be considered consistent with the principles of the present disclosure. Accordingly, the embodiments of the present disclosure are not limited to the embodiments expressly presented and described in the present disclosure.

Claims (34)

1. Acoustic output device, containing: the first acoustic pathogen containing the first diaphragm; the second acoustic pathogen containing the second diaphragm; a control circuit electrically connected to the first acoustic exciter and the second acoustic exciter, respectively, the control circuit is configured to provide a first electrical signal for vibrating the first diaphragm and a second electrical signal for vibrating the second diaphragm, wherein the phase of the first electrical signal and the phase of the second electrical signal are opposite; And housing for accommodating the first acoustic exciter and the second acoustic exciter, while the sound generated by the vibration of the first diaphragm is radiated outward through the first sound guide hole located on the body, and the sound generated by the vibration of the second diaphragm is radiated outward through the second sound guide hole located on the body, and the difference between the amplitude-frequency characteristic of the first acoustic exciter and the amplitude-frequency characteristic of the second acoustic exciter in the medium-high frequency range does not exceed 6 dB. 2. Acoustic output device according to claim 1, in which the first acoustic driver comprises a first magnetic circuit structure, the second acoustic driver comprises a second magnetic circuit structure, and when the first diaphragm is driven by the first electrical signal to vibrate in the direction of the first magnetic circuit structure, the second diaphragm is driven by the second electrical signal to vibrate in the direction away from the second magnetic circuit structure. 3. Acoustic output device according to claim 2, in which the body contains at least the first cavity and the second cavity, and the first cavity does not communicate with the second cavity, while the first acoustic exciter is located in the first cavity, and the second acoustic exciter is located in the second cavity. 4. Acoustic output device according to claim 3, in which the first cavity is the same as the second cavity, the anterior cavity of the first acoustic exciter is the same as the anterior cavity of the second acoustic exciter, and the posterior cavity of the first acoustic driver is the same as the posterior cavity of the second acoustic driver. 5. Acoustic output device according to claim 3, in which the first sonic guide hole communicates with the first cavity, the second sonic guide hole communicates with the second cavity; the first acoustic driver is configured to emit sound from the first sound guide hole, the second acoustic driver is configured to emit sound from the second sound guide hole; And the phase of the sound emitted by the first acoustic driver from the first sound guide hole is opposite to the phase of the sound emitted by the second acoustic driver from the second sound guide hole. 6. Acoustic output device according to any one of paragraphs. 1-5, in which the control circuit is configured to generate an audio signal, while the first acoustic driver and the second acoustic driver are configured to receive an audio signal with opposite polarities, respectively, to obtain a first electrical signal and a second electrical signal, respectively. 7. Acoustic output device according to any one of paragraphs. 1-5, in which the first acoustic driver and the second acoustic driver are electrically connected to the control circuit in the same polarity, respectively, wherein the first acoustic driver or the second acoustic driver is electrically connected to the control circuit via a phase inverter circuit. 8. Acoustic output device according to claim 1, in which the difference between the amplitude-frequency characteristic of the first acoustic exciter and the amplitude-frequency characteristic of the second acoustic exciter, at least in the low-frequency region, is at least 10 dB, and the acoustic path from the first acoustic exciter or from a second acoustic exciter with a larger amplitude-frequency response in the low-frequency range to the user's ear is smaller. 9. Acoustic output device according to claim 1, further comprising: the third acoustic exciter containing the third diaphragm, while the control circuit is configured to provide a third electrical signal for vibrating the third diaphragm to generate a low frequency sound, wherein low-frequency sound is emitted to the outside through a third sound guide hole and a fourth sound guide hole located on the body.

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