Noise reduction earphone

Abstract

The invention provides a noise reduction earphone, and the earphone comprises a housing which is provided with a sound outlet and an inner cavity, and the inner cavity is communicated with the sound outlet; the loudspeaker is arranged in the inner cavity, and the loudspeaker and the cavity wall of the area, communicated with the sound outlet, of the inner cavity are enclosed to form a first sound cavity; the first microphone is connected with the shell, the first microphone deviates from the ear canal under the condition that the sound outlet of the noise reduction earphone is arranged in the ear canal, and the first microphone is used for acquiring environmental noise; the second microphone is arranged in the shell, the second microphone faces the loudspeaker, and the second microphone is used for acquiring the first sound in the first sound cavity; the third microphone is arranged in the shell, the third microphone faces the sound outlet, and the third microphone is used for acquiring the second sound of the ear canal; the loudspeaker is used for emitting an inverted sound wave determined based on the ambient noise, the first sound and the second sound, and the inverted sound wave is used for neutralizing the noise.

Description

Technical Field

[0001] The present application relates to the field of earphone technology, and in particular to a noise-canceling earphone. Background Art

[0002] Headphones generally use a feedforward noise reduction solution or a feedback noise reduction solution to reduce noise. Among them, the headphones with the feedforward noise reduction solution are provided with a microphone in the headphone shell. When the sound outlet of the headphone is set in the user's ear canal, the microphone is away from the user's ear canal. The microphone is used to obtain environmental noise, so that feedforward filtering adjustment can be performed based on the environmental noise to reduce the impact of environmental noise. The headphones with the feedback noise reduction solution are provided with a microphone in the sound cavity formed by the speaker of the headphone and the inner cavity of the headphone shell. The microphone is used to obtain the noise in the sound cavity surrounded by the speaker, and then feedback filtering is performed based on the noise in the sound cavity surrounded by the speaker to reduce the noise in the user's ear.

[0003] Feedforward noise reduction is less effective against unpredictable noise. Feedback noise reduction uses a microphone some distance from the ear canal, so the noise signal it picks up differs from the noise signal inside the ear canal. This leaves room for further improvement in the noise reduction performance of headphones. Summary of the Invention

[0004] The embodiments of the present application provide a noise-canceling headset to solve the problem of how to improve the noise reduction effect of the headset.

[0005] In order to solve the above technical problems, this application is implemented as follows: The noise-canceling headphones provided in the embodiment of the present application include: a shell, the shell having a sound outlet and an inner cavity, the inner cavity being connected to the sound outlet; a speaker, arranged in the inner cavity, the speaker and the cavity wall of the inner cavity in the area connected to the sound outlet enclose each other to form a first sound cavity; a first microphone, connected to the shell, when the sound outlet of the noise-canceling headphones is arranged in the ear canal, the first microphone faces away from the ear canal, and the first microphone is used to obtain ambient noise; a second microphone, arranged in the shell, the second microphone faces the speaker, and the second microphone is used to obtain a first sound in the first sound cavity; a third microphone, arranged in the shell, the third microphone faces the sound outlet, and the third microphone is used to obtain a second sound in the ear canal; the speaker is used to emit an anti-phase sound wave determined based on the ambient noise, the first sound, and the second sound, wherein the anti-phase sound wave is used to neutralize the noise.

[0006] In some embodiments, the direction of the sound input portion of the third microphone is opposite to the direction of the sound input portion of the second microphone.

[0007] In some embodiments, the sound input portion of the second microphone is fixedly connected to the sound output portion of the speaker.

[0008] In some embodiments, a first through hole communicating with the sound outlet is provided on the wall of the inner cavity; the third microphone is provided in the inner cavity, and a sound inlet of the third microphone is connected to the first through hole.

[0009] In some embodiments, a second through hole is provided in the cavity wall of the inner cavity; and the second microphone is provided in the second through hole.

[0010] In some embodiments, the third microphone is disposed on a side of the second microphone facing away from the speaker.

[0011] In some embodiments, a third through hole is provided in the cavity wall of the inner cavity, and the third through hole is opposite to the sound outlet; the third microphone is provided in the third through hole, and the sound inlet of the third microphone faces the sound outlet.

[0012] In some embodiments, the noise-canceling earphones further include a driving component; the third microphone is connected to the housing via the driving component, and the driving component is used to drive the third microphone to move toward or away from the sound outlet.

[0013] In some embodiments, the driving assembly includes a telescopic sleeve and a memory metal part. One end of the telescopic sleeve is connected to the shell, and the other end is connected to the third microphone. The telescopic direction of the telescopic sleeve is parallel to the opening direction of the sound outlet; the memory metal part is respectively connected to the two ends of the telescopic sleeve. When power is supplied to the memory metal part, the memory metal part drives the telescopic sleeve to switch to the extended state.

[0014] In some embodiments, the drive assembly further includes an elastic element, which is respectively connected to both ends of the telescopic sleeve. The elastic element is used to drive the telescopic sleeve to switch to a shortened state when the memory metal piece is powered off.

[0015] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: In the embodiment of the present application, the speaker can generate anti-phase sound waves based on the ambient noise, the first sound, and the second sound, so that the anti-phase sound waves can be used to neutralize the noise. Since the noise information collected in the embodiment of the present application is relatively rich, the noise reduction effect of the noise-canceling headphones can be improved.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of a first noise-canceling headset provided in an embodiment of the present application; Figure 2 for Figure 1 A cross-sectional view of the noise-canceling earphones shown in FIG. 1 along a cross section passing through line AA; Figure 3 for Figure 2 A partial schematic diagram of a cross-sectional view of the noise-canceling headphones shown in FIG; Figure 4 for Figure 1 A cross-sectional view of the noise-canceling earphones shown in FIG. 1 along a cross section passing through line BB; Figure 5 for Figure 4 A partial schematic diagram of a cross-sectional view of the noise-canceling headphones shown in FIG; Figure 6 A schematic diagram of a second noise-canceling headset provided in an embodiment of the present application, showing a situation where the third microphone of the noise-canceling headset is in a retracted state; Figure 7 for Figure 6 A cross-sectional view of the noise-canceling earphones shown in FIG. 1 , taken along a cross-section passing through line CC; Figure 8 A schematic diagram of a second noise-canceling headset provided in an embodiment of the present application, showing a situation where the third microphone of the noise-canceling headset is extended; Figure 9 for Figure 8 A cross-sectional view of the noise cancelling earphones shown in FIG. 1 along a cross section passing through line DD; Figure 10 A schematic diagram of a drive assembly provided in an embodiment of the present application, showing the drive assembly in a shortened state; Figure 11 A schematic diagram of a drive assembly provided in an embodiment of the present application, showing the drive assembly in an extended state; Figure 12 A cross-sectional view of a telescopic sleeve of a drive assembly provided in an embodiment of the present application, showing the telescopic sleeve in an extended state; Figure 13 A schematic diagram of a memory metal member provided in an embodiment of the present application, showing the memory metal member in a shortened state; Figure 14 A schematic diagram of a memory metal member provided in an embodiment of the present application, showing the memory metal member in an extended state; Figure 15 A schematic diagram of a memory metal component and a power supply circuit provided in an embodiment of the present application; Figure 16 A schematic diagram of a third noise-canceling headset provided in an embodiment of the present application; Figure 17 for Figure 16 A cross-sectional view of the noise-canceling earphones shown in FIG. 1 along a cross section passing through line EE; Figure 18 A schematic diagram of the noise-canceling headphones and ear area provided in an embodiment of the present application; Figure 19 A schematic diagram illustrating the connection relationship of the main components of the noise-canceling headphones provided in an embodiment of the present application.

[0019] Description of reference numerals: 100-Noise Cancelling Headphones; 110 - housing; 111 - sound outlet; 112 - inner cavity; 113 - first sound cavity; 114 - first through hole; 115 - second through hole; 116 - third through hole; 117 - recessed portion; 120 - speaker; 121 - sound output portion of the speaker; 130-first microphone; 140 - second microphone; 141 - sound input portion of the second microphone; 150 - third microphone; 151 - sound input portion of the third microphone; 160-controller; 161-feedforward noise reduction unit; 162-feedback noise reduction unit; 170-driving assembly; 171-telescopic sleeve; 172-memory metal piece; 173-elastic element; 180-power supply circuit; 190-flexible circuit board; 200-ear canal. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0022] In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article.

[0023] Furthermore, it is required that the application be understood not only by the actual terms used but also by the meanings connoted by each term.

[0024] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0025] The embodiment of the present application provides a noise reduction headset. Figures 1 to 19 The noise-canceling earphones 100 provided in this embodiment include a housing 110, a speaker 120, a first microphone 130, a second microphone 140, and a third microphone 150. For example, the noise-canceling earphones 100 may be in-ear noise-canceling earphones. The noise-canceling earphones 100 may also be true wireless stereo (TWS) noise-canceling earphones. Of course, the noise-canceling earphones 100 may also be other types of noise-canceling earphones, which are not listed here.

[0026] The housing 110 has a sound outlet 111 and an inner cavity 112, which is connected to the sound outlet 111. A speaker 120 is disposed in the inner cavity 112. The speaker 120 and the walls of the inner cavity 112 in the area connected to the sound outlet 111 enclose a first sound cavity 113. Thus, the sound emitted by the speaker 120 toward the first sound cavity 113 can be transmitted to the outside of the noise-canceling earphone 100 through the sound outlet 111.

[0027] It should be noted that Figure 4 Taking the illustrated orientation as an example, a sound outlet 111 is provided above the housing 110, and an inner cavity 112 is provided below the sound outlet 111. The upper region of the inner cavity 112 is connected to the sound outlet 111 located above. A speaker 120 is provided in the inner cavity 112, and the speaker 120 and the cavity wall of the upper region of the inner cavity 112 are enclosed to form a first sound cavity 113. In addition, for example, the speaker 120 and the cavity wall of the lower region of the inner cavity 112 are enclosed to form a second sound cavity. For example, the first sound cavity 113 can be referred to as the front sound cavity, and the second sound cavity can be referred to as the rear sound cavity.

[0028] Furthermore, in an embodiment of the present invention, the first microphone 130 is connected to the housing 110 . When the sound outlet 111 of the noise-canceling earphone 100 is disposed in the ear canal 200 , the first microphone 130 faces away from the ear canal 200 . The first microphone 130 is used to acquire ambient noise.

[0029] It should be noted that the first microphone 130 can be located in most areas of the housing 110. It is sufficient to ensure that, when the sound outlet 111 of the noise-canceling earphones 100 is located in the ear canal 200, the sound input portion of the first microphone 130 is not blocked by the ear canal 200, thereby ensuring that the sound input portion of the first microphone 130 can receive external ambient noise. In other words, when the noise-canceling earphones 100 are worn on the user's ears, the first microphone 130 is located in a position where it is not blocked by the user's ears, thereby enabling the first microphone 130 to better capture ambient noise.

[0030] Furthermore, a second microphone 140 is disposed within the housing 110. The second microphone 140 faces the speaker 120 and is used to capture the first sound within the first sound cavity 113. A third microphone 150 is disposed within the housing 110 and faces the sound outlet 111 and is used to capture the second sound in the ear canal 200.

[0031] The speaker 120 is configured to emit an anti-phase sound wave determined based on the ambient noise, the first sound, and the second sound, wherein the anti-phase sound wave is configured to neutralize the noise.

[0032] In this way, in the embodiment of the present application, the speaker 120 can generate anti-phase sound waves based on the ambient noise, the first sound, and the second sound, thereby using the anti-phase sound waves to neutralize the noise. Since the noise information collected in the embodiment of the present application is relatively rich, the noise reduction effect of the noise-canceling headphones 100 can be improved.

[0033] refer to Figure 18 and Figure 19 In some embodiments, the noise-canceling headphones 100 further include a controller 160. The controller 160 is electrically connected to the speaker 120, the first microphone 130, the second microphone 140, and the third microphone 150, respectively. The controller 160 is configured to receive electrical signals associated with noise signals from the first microphone 130, the second microphone 140, and the third microphone 150. The controller 160 processes the electrical signals associated with the noise and generates electrical signals associated with anti-phase sound waves. Furthermore, the controller 160 transmits the electrical signals associated with the anti-phase sound waves to the speaker 120, causing the speaker 120 to emit anti-phase sound waves, thereby utilizing the anti-phase sound waves to neutralize the noise, thereby achieving a noise reduction function.

[0034] In some embodiments, the controller 160 includes a feedforward noise reduction unit 161 and a feedback noise reduction unit 162. The first microphone 130 is connected to the speaker 120 via the feedforward noise reduction unit 161, and the third microphone 150 is connected to the feedforward noise reduction unit 161. The second microphone 140 is connected to the speaker 120 via the feedback noise reduction unit 162.

[0035] In this way, when the noise-canceling earphones 100 are in the noise-canceling working state, the feedforward noise reduction unit 161 can perform feedforward noise reduction based on the noise signal in the user's ear canal 200 obtained by the third microphone 150 and the ambient noise obtained by the first microphone 130. The noise signal in the user's ear canal 200 obtained by the third microphone 150 is fed back to the feedforward noise reduction unit 161, thereby correcting the noise reduction path for performing feedforward noise reduction based on the ambient noise obtained by the first microphone 130 to enhance the feedforward noise reduction effect. The feedback noise reduction unit 162 can perform feedback noise reduction based on the noise signal in the first sound cavity 113 obtained by the second microphone 140. Thus, the overall noise reduction effect of the noise-canceling earphones 100 can be enhanced.

[0036] It should be noted that, combined with Figure 18 and Figure 19 If the second microphone 140 is eliminated and the noise signal obtained by the third microphone 150 is used for feedback noise reduction, although the noise signal in the user's ear canal 200 can be obtained by the third microphone 150, since the third microphone 150 is relatively far away from the speaker 120, the noise signal of the speaker 120 received by the third microphone 150 is delayed, which makes the feedback noise reduction effect less than ideal.

[0037] By adopting the solution provided in the embodiment of the present application, the noise signal in the user's ear canal 200 obtained by the third microphone 150 can be used to correct the noise reduction path of the feedforward noise reduction to improve the feedforward noise reduction effect; the noise signal in the first sound cavity 113 obtained by the second microphone 140 can be used for feedback noise reduction, which can improve the overall noise reduction effect of the noise-canceling headphones 100.

[0038] It should also be noted that the principles of feedforward noise reduction and feedback noise reduction can refer to relevant technologies, and the noise reduction processes and algorithms of feedforward noise reduction and feedback noise reduction will not be elaborated here.

[0039] In an embodiment of the present application, the first microphone 130, the second microphone 140, and the third microphone 150 are all energy conversion devices for converting sound signals into electrical signals. The speaker 120 is an energy conversion device for converting electrical signals into sound signals. The controller 160 is a set of devices for controlling the speaker 120 to emit normal sound and anti-phase sound waves associated with the noise signal based on the noise signal obtained by the first microphone 130, the second microphone 140, and the third microphone 150. Among them, the normal sound is the sound that the electronic device connected to the noise-canceling headphones needs to play, and the anti-phase sound wave is used to neutralize the noise. For example, the electronic device needs to play a song, and the normal sound is the sound corresponding to the song that the electronic device needs to play. The anti-phase sound wave associated with the noise signal will cancel each other out with the noise, so that the user basically cannot feel the noise.

[0040] In order to enable those skilled in the art to better implement the solutions provided by the present invention, more detailed examples are provided below for reference by those skilled in the art.

[0041] refer to Figure 1 and Figure 2 In some embodiments, a groove is provided on the side of the housing 110 facing away from the sound outlet 111. The notch of the groove is opposite to the opening of the sound outlet 111. The first microphone 130 is housed in the groove. This allows the first microphone 130 to be exposed when the noise-canceling headphone 100 is worn on the user's ear, thereby effectively capturing ambient noise.

[0042] refer to Figures 1 to 5 In some embodiments, the sound input portion 141 of the second microphone 140 faces the sound output portion 121 of the speaker 120. This allows the sound input portion 141 of the second microphone 140 to better receive the sound signal emitted by the speaker 120 and reduces the sound signal reflected by the user's ear canal 200 and received by the sound input portion 141 of the second microphone 140. This improves the accuracy of the noise signal in the first sound cavity 113 acquired by the second microphone 140.

[0043] refer to Figures 1 to 5 In some embodiments, the sound input portion 151 of the third microphone 150 is oriented opposite to the sound input portion 141 of the second microphone 140. Since the sound input portion 141 of the second microphone 140 faces the speaker 120, the sound input portion 151 of the third microphone 150 is oriented opposite to the sound input portion 141 of the second microphone 140. Therefore, the sound input portion 151 of the third microphone 150 is less likely to receive sound emitted by the speaker 120, thereby reducing interference from the sound emitted by the speaker 120 on the third microphone 150. This can improve the accuracy with which the third microphone 150 can capture the second sound from the ear canal 200.

[0044] refer to Figures 1 to 5 In some embodiments, a sound outlet channel is provided on the side of the second microphone 140 and the third microphone 150. The sound outlet channel connects the first sound cavity 113 and the sound outlet 111. In this way, the sound emitted by the speaker 120 can be transmitted outside the noise-canceling headphone 100 through the first sound cavity 113 and the sound outlet channel and the sound outlet 111.

[0045] refer to Figures 1 to 5 In some embodiments, the wall of the inner cavity 112 is provided with a first through-hole 114 that communicates with the sound outlet 111. The third microphone 150 is disposed within the inner cavity 112, with the sound inlet 151 of the third microphone 150 connected to the first through-hole 114. Thus, when the noise-canceling earphone 100 is worn on the user's ear, the second sound reflected from the ear canal 200 can be sequentially transmitted through the sound outlet 111 and the first through-hole 114 of the housing 110 to the sound inlet 151 of the third microphone 150. Thus, the third microphone 150 can capture the second sound from the ear canal 200 through the first through-hole 114.

[0046] Furthermore, in some embodiments, the portion of the inner wall of the shell 110 opposite to the speaker 120 is a recessed portion 117. The first through hole 114 passes through the bottom wall of the recessed portion 117, and the first through hole 114 is connected to the sound outlet 111 of the shell 110. The third microphone 150 is arranged in the area surrounded by the recessed portion 117. The sound inlet 151 of the third microphone 150 is connected to the first through hole 114. Therefore, when the noise reduction earphones 100 are worn on the user's ears, the second sound reflected by the ear canal 200 can be transmitted to the sound inlet 151 of the third microphone 150 in sequence through the sound outlet 111 and the first through hole of the shell 110, so that the third microphone 150 can obtain the second sound of the ear canal 200 through the first through hole.

[0047] Furthermore, in some embodiments, the sound input portion 141 of the second microphone 140 faces the sound output portion 121 of the speaker 120, and the second microphone 140 blocks the opening of the recess 117. This allows the third microphone 150 to be located within the area enclosed by the recess 117 and the second microphone 140, thereby better preventing the sound emitted by the speaker 120 from being received by the third microphone 150. This further improves the accuracy with which the third microphone 150 can capture the second sound in the ear canal 200.

[0048] refer to Figures 1 to 5 In some embodiments, the noise-canceling headphones 100 further include a flexible circuit board 190 and a circuit board (not shown). Exemplarily, the circuit board is the headphone motherboard. The second microphone 140 and the third microphone 150 are each connected to the flexible circuit board 190 . The flexible circuit board 190 is connected to the circuit board.

[0049] refer to Figure 6 and Figure 7 In some embodiments, the wall of the inner cavity 112 is provided with a second through hole 115. The second microphone 140 is disposed in the second through hole 115. In this way, the second microphone 140 can block the second through hole 115, so that the second microphone 140, the speaker 120, and the wall of the inner cavity 112 between the second microphone 140 and the speaker 120 form the first sound cavity 113. Thus, by disposing the second microphone 140 in the second through hole 115 in the wall of the inner cavity 112, the compactness of the noise-canceling earphone 100 is improved.

[0050] In some embodiments, the third microphone 150 is disposed on a side of the second microphone 140 facing away from the speaker 120. In this way, the second microphone 140 can be separated between the speaker 120 and the third microphone 150 to prevent the sound emitted by the speaker 120 from being received by the third microphone 150, thereby further improving the accuracy of the third microphone 150 in capturing the second sound in the ear canal 200.

[0051] refer to Figure 6 and Figure 7 In some embodiments, a third through hole 116 is defined in the wall of the inner cavity 112, facing the sound outlet 111 of the housing 110. A third microphone 150 is disposed in the third through hole 116, with the sound inlet 151 of the third microphone 150 facing the sound outlet 111. By disposing the third microphone 150 in the third through hole 116 in the wall of the inner cavity 112, the noise-canceling headphone 100 can be made more compact.

[0052] In some embodiments, the third through hole 116 is opposite the second through hole 115 and is located on the side of the second through hole 115 facing away from the speaker 120. This allows the third microphone 150, located in the third through hole 116, to be located on the side of the second microphone 140, located in the second through hole 115, facing away from the speaker 120. This allows the second microphone 140 to be separated between the speaker 120 and the third microphone 150, preventing the sound emitted by the speaker 120 from being received by the third microphone 150. This further improves the accuracy with which the third microphone 150 can capture the second sound in the ear canal 200.

[0053] In some embodiments, the sound input portion 141 of the second microphone 140 is fixedly connected to the sound output portion 121 of the speaker 120. For example, the sound output portion 121 of the speaker 120 is the portion where the diaphragm of the speaker 120 is located, and the sound input portion 141 of the second microphone 140 is the portion where the diaphragm of the second microphone 140 is located. The diaphragm of the second microphone 140 can be fixedly connected to the diaphragm of the speaker 120. In this way, when the speaker 120 emits sound, the sound input portion 141 of the second microphone 140 can simultaneously receive the sound emitted by the sound output portion 121 of the speaker 120, thereby improving the accuracy of the noise signal within the first sound cavity 113 acquired by the second microphone 140.

[0054] refer to Figures 6 to 9 In some embodiments, the noise-canceling headphone 100 further includes a drive assembly 170. Exemplarily, the drive assembly 170 is a linear actuator. For example, the linear actuator is a linear motor. The third microphone 150 is connected to the housing 110 via the drive assembly 170. The drive assembly 170 is configured to drive the third microphone 150 toward or away from the sound outlet 111.

[0055] Thus, when the noise canceling earphones 100 are turned on for noise cancellation, the driver assembly 170 can be used to drive the third microphone 150 toward the sound outlet 111, thereby extending the third microphone 150. Thus, by driving the third microphone 150 toward the sound outlet 111, the third microphone 150 can be brought closer to the user's ear canal 200, further improving the accuracy with which the third microphone 150 can capture noise within the user's ear canal 200, thereby enhancing the noise cancellation effect of the noise canceling earphones 100.

[0056] Furthermore, when the noise reduction function of the noise reduction earphone 100 is turned off, the driving component 170 can be used to drive the third microphone 150 to move away from the sound outlet 111, thereby retracting the third microphone 150. This prevents the third microphone 150 from being exposed and easily damaged.

[0057] refer to Figures 10 to 12 In some embodiments, the drive assembly 170 includes a telescopic tube 171. One end of the telescopic tube 171 is connected to the housing 110, and the other end is connected to the third microphone 150. The telescopic tube 171 extends in a direction parallel to the opening of the sound outlet 111. This allows the telescopic tube 171 to support the third microphone 150, improving its smooth movement.

[0058] For example, refer to Figure 12The telescopic sleeve 171 comprises multiple tubes of gradually increasing diameter. The tubes are nested in ascending order of diameter. When a force is applied to the telescopic sleeve 171, causing the tubes at both ends to move away from each other, the telescopic sleeve 171 switches to an extended state. When a force is applied to the telescopic sleeve 171, causing the tubes at both ends to move toward each other, the telescopic sleeve 171 switches to a shortened state.

[0059] refer to Figure 9 In some embodiments, one end of the telescopic sleeve 171 is connected to the second microphone 140, and the other end is connected to the third microphone 150. The second microphone 140 is connected to the housing 110. In this way, the telescopic sleeve 171 can be indirectly connected to the housing 110 by connecting the telescopic sleeve 171 to the second microphone 140, and the second microphone 140 to the housing 110.

[0060] refer to Figures 10 to 15 In some embodiments, the drive assembly 170 further includes a memory metal member 172. The memory metal member 172 is connected to both ends of the telescopic sleeve 171. When power is supplied to the memory metal member 172, the memory metal member 172 drives the telescopic sleeve 171 to switch to the extended state. Exemplarily, the memory metal member 172 is made of a temperature-sensitive metal material. Thus, when power is supplied to the memory metal member 172, the temperature of the memory metal member 172 rises, causing the memory metal member 172 to switch to the extended state, thereby causing the telescopic sleeve 171 to switch to the extended state.

[0061] In some embodiments, the noise-canceling earphones 100 further include a power supply circuit 180 . The power supply circuit 180 is electrically connected to the memory metal member 172 . The power supply circuit 180 is configured to supply power to the memory metal member 172 to heat the memory metal member 172 , thereby causing the memory metal member 172 to drive the telescopic sleeve 171 to switch to the extended state.

[0062] It should be noted that after wearing the noise-canceling earphones 100 for a period of time, moisture in the ear canal 200 is blocked by the noise-canceling earphones 100 and is therefore difficult to expel into the external environment, which may deteriorate the air quality in the ear canal 200. With the solution provided in the embodiment of the present application, when the noise-canceling earphones 100 are in noise-canceling mode, the temperature of the memory metal member 172 increases, which increases the dryness of the air in the ear canal 200 and, in turn, improves the air quality in the ear canal 200, making it less likely for bacteria to grow in the ear canal 200.

[0063] It should also be noted that when the noise-canceling earphones 100 are in the noise-canceling mode, the specific temperature range of the memory metal piece 172 can be determined through experiments and will not be further described here.

[0064] refer to Figure 10 and Figure 11 In some embodiments, the memory metal member 172 is spiral-shaped and is positioned outside the telescopic sleeve 171. This spiral shape increases the overall length of the memory metal member 172, making it easier for the memory metal member 172 to deform, thereby reducing the time it takes for the memory metal member 172 to switch to the extended state. Furthermore, positioning the memory metal member 172 outside the telescopic sleeve 171 prevents accidental separation of the memory metal member 172 from the telescopic sleeve 171.

[0065] refer to Figure 10 and Figure 11 In some embodiments, the drive assembly 170 further includes an elastic element 173. The elastic element 173 is connected to both ends of the telescopic sleeve 171. The elastic element 173 is used to drive the telescopic sleeve 171 to switch to the shortened state when the memory metal member 172 is powered off.

[0066] In this way, when selecting the material for memory metal member 172, it is sufficient that the material of memory metal member 172 can quickly switch to the extended state when the temperature rises. When the power supply circuit 180 is disconnected, even if the memory metal member 172 cannot quickly switch to the shortened state, the telescopic sleeve 171 can still switch to the shortened state under the action of the elastic element 173. Therefore, the solution provided in the embodiment of the present application can increase the flexibility of the material selection for memory metal member 172.

[0067] In some embodiments, the elastic element 173 is a cylindrical spring, and the elastic element 173 is sleeved outside the telescopic sleeve 171. Exemplarily, the elastic element 173 is also sleeved outside the memory metal member 172. In this way, by positioning the memory metal member 172 between the telescopic sleeve 171 and the elastic element 173, the memory metal member 172 can be prevented from accidentally deforming excessively along the radial direction of the telescopic sleeve 171.

[0068] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0069] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the embodiments of the present application, and the scope of the embodiments of the present application is defined by the appended claims and their equivalents.

Claims

1. A noise-canceling headset, characterized in that: include: A housing (110), the housing (110) having a sound outlet (111) and an inner cavity (112), the inner cavity (112) being in communication with the sound outlet (111); A loudspeaker (120) is provided in the inner cavity (112), wherein the loudspeaker (120) and the cavity wall of the inner cavity (112) in an area communicating with the sound outlet (111) are enclosed to form a first sound cavity (113); a first microphone (130) connected to the housing (110); when the sound outlet (111) of the noise-canceling earphone is arranged in the ear canal (200), the first microphone (130) faces away from the ear canal (200); and the first microphone (130) is used to acquire ambient noise; a second microphone (140) disposed in the housing (110), the second microphone (140) facing the speaker (120), and the second microphone (140) being used to acquire a first sound in the first sound cavity (113); a third microphone (150) disposed in the housing (110), the third microphone (150) facing the sound outlet (111), and used for acquiring a second sound from the ear canal (200); The speaker (120) is used to emit an anti-phase sound wave determined based on the environmental noise, the first sound and the second sound, wherein the anti-phase sound wave is used to neutralize the noise.

2. The noise-canceling headphones according to claim 1, wherein: The direction of the sound input portion (151) of the third microphone (150) is opposite to the direction of the sound input portion (141) of the second microphone (140).

3. The noise-canceling headphones according to claim 1, wherein: The sound input portion (141) of the second microphone (140) is fixedly connected to the sound output portion (121) of the speaker (120).

4. The noise-canceling headphones according to claim 1, wherein: The cavity wall of the inner cavity (112) is provided with a first through hole (114) communicating with the sound outlet (111); the third microphone (150) is arranged in the inner cavity (112), and the sound inlet portion (151) of the third microphone (150) is connected to the first through hole (114).

5. The noise-canceling headphones according to claim 1, wherein: A second through hole (115) is provided on the cavity wall of the inner cavity (112); and the second microphone (140) is provided in the second through hole (115).

6. The noise-canceling earphone according to claim 5, wherein: The third microphone (150) is arranged on a side of the second microphone (140) facing away from the speaker (120).

7. The noise-canceling headphones according to claim 1, wherein: A third through hole (116) is provided on the cavity wall of the inner cavity (112), and the third through hole (116) is opposite to the sound outlet (111); the third microphone (150) is provided in the third through hole (116), and the sound inlet portion (151) of the third microphone (150) faces the sound outlet (111).

8. The noise-canceling headphones according to claim 1, wherein: The noise-cancelling earphones further include a driving component (170); The third microphone (150) is connected to the housing (110) via the driving component (170), and the driving component (170) is used to drive the third microphone (150) to move towards or away from the sound outlet (111).

9. The noise-canceling headphones according to claim 8, wherein: The driving assembly (170) comprises a telescopic sleeve (171) and a memory metal piece (172); one end of the telescopic sleeve (171) is connected to the housing (110), and the other end is connected to the third microphone (150); the telescopic direction of the telescopic sleeve (171) is parallel to the opening direction of the sound outlet (111); The memory metal piece (172) is respectively connected to both ends of the telescopic sleeve (171); when power is supplied to the memory metal piece (172), the memory metal piece (172) drives the telescopic sleeve (171) to switch to an extended state.

10. The noise-canceling earphone according to claim 9, wherein: The driving assembly (170) further includes an elastic element (173), wherein the elastic element (173) is respectively connected to both ends of the telescopic sleeve (171), and the elastic element (173) is used to drive the telescopic sleeve (171) to switch to a shortened state when the memory metal part (172) is powered off.

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