CN113613134A

CN113613134A - Earphone set

Info

Publication number: CN113613134A
Application number: CN202110898455.XA
Authority: CN
Inventors: 徐银海; 刘益帆
Original assignee: Beijing Ansheng Haolang Technology Co ltd
Current assignee: Beijing Ansheng Haolang Technology Co ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2021-11-05
Anticipated expiration: 2041-08-05
Also published as: CN113613134B

Abstract

The application provides a headset, including: a housing; the first microphone is positioned on the shell and used for acquiring an external noise signal; the loudspeaker is positioned in the inner cavity of the shell and used for playing audio signals; the second microphone is positioned at the sound outlet of the earphone and used for acquiring an initial heartbeat sound signal; and the filter is electrically connected with the first microphone and the second microphone and is used for filtering the external noise signal and the audio signal from the initial heartbeat sound signal to obtain a target heartbeat sound signal. The earphone provided by the embodiment of the application utilizes the microphone to collect the initial heartbeat sound signal, and then filters other signals from the initial heartbeat sound signal to obtain the target heartbeat sound signal. The technical scheme of this application can promote the SNR of target heartbeat acoustic signal to improve the rate of accuracy that heartbeat acoustic signal detected, and this application only utilizes the hardware that the earphone was always equipped with to accomplish the detection of heartbeat acoustic signal, the scheme cost is lower.

Description

Earphone set

Technical Field

The application relates to the technical field of electronic equipment, in particular to an earphone.

Background

Along with the improvement of the living standard of the material, the attention of people to the self health is continuously promoted, so that the intelligent wearable equipment with the health management function is more and more widely used. Among the health management function that intelligent wearing equipment possessed, heartbeat detection is the function that the user relatively paid attention to. The existing intelligent wearable equipment (such as a sports bracelet and a sports watch) mainly adopts a light sensation detection system to carry out heartbeat detection, the wearing requirement of the detection system on the equipment is higher, the user wrist has a nonstandard wearing posture, so that misinduction or even induction can be possibly caused, and the reliability of heartbeat detection is lower.

Disclosure of Invention

In view of the above, the present application is directed to provide an earphone to improve the accuracy of detecting a heartbeat sound signal.

The application provides a headset, includes: a housing; the first microphone is positioned on the shell and used for acquiring an external noise signal; the loudspeaker is positioned in the inner cavity of the shell and used for playing audio signals; the second microphone is positioned at the sound outlet of the earphone and used for acquiring an initial heartbeat sound signal; and the filter is electrically connected with the first microphone and the second microphone and is used for filtering the external noise signal and the audio signal from the initial heartbeat sound signal to obtain a target heartbeat sound signal.

Optionally, the filter comprises: the first estimation unit is used for obtaining an estimation signal of the external noise signal according to a transfer function corresponding to a transmission path from the first microphone to the second microphone; the second estimation unit is used for obtaining an estimation signal of the audio signal according to a transfer function corresponding to a transmission path from the loudspeaker to the second microphone; and the adder unit is used for subtracting the estimation signal of the external noise signal and the estimation signal of the audio signal from the initial heartbeat sound signal to obtain the target heartbeat sound signal.

Optionally, the second microphones are at least two, and the filter is configured to: respectively filtering corresponding external noise signals and audio signals from the initial heartbeat sound signals collected by each second microphone to obtain at least two heartbeat sound signals to be processed; and weighting the at least two heartbeat sound signals to be processed so as to further relatively attenuate the external noise signal and the audio signal to obtain the target heartbeat sound signal.

Optionally, the filter comprises a beamformer having a main lobe direction pointing in-ear and a null direction pointing out-of-ear, the beamformer being configured to: and inputting the heartbeat sound signals to be processed corresponding to each second microphone into the beam former respectively for weighting processing to obtain the target heartbeat sound signals.

Optionally, the headset is a half-in-ear headset.

Optionally, the filter is further configured to: and obtaining a heartbeat sound signal waveform record and/or a heart rate index according to the target heartbeat sound signal.

Optionally, the earphone further includes an in-ear detection unit, where the in-ear detection unit is configured to determine whether the earphone is in-ear according to the target heartbeat sound signal: if the target heartbeat sound signal exists, determining that the earphone is in the ear; and if the target heartbeat sound signal does not exist, determining that the earphone is not inserted into the ear.

Optionally, the in-ear detection unit is further configured to determine the wearing tightness of the earphone according to the strength of the target heartbeat sound signal; and the earphone carries out corresponding tone quality balance adjustment on the audio signal based on the compactness.

Optionally, the filter is further configured to: determining the second estimation unit based on the audio signal, the estimated signal of the audio signal and the initial heartbeat sound signal.

Optionally, the second microphone is a call microphone of an earphone.

The earphone provided by the embodiment of the application utilizes the microphone to collect the initial heartbeat sound signal, and then filters other signals from the initial heartbeat sound signal to obtain the target heartbeat sound signal. The technical scheme of this application can promote the SNR of target heartbeat acoustic signal to improve the rate of accuracy that heartbeat acoustic signal detected, and this application embodiment only utilizes the hardware that the earphone was always equipped with to accomplish the detection of heartbeat acoustic signal, and the scheme cost is lower.

Drawings

Fig. 1 is a schematic structural diagram of an earphone according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a filter provided in an embodiment of the present application.

Fig. 3 is a schematic structural diagram of an earphone according to another embodiment of the present application.

Fig. 4 is a schematic flow chart of an in-ear detection method according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of an earphone according to another embodiment of the present application.

Fig. 6 is a schematic flow chart of a method for detecting a heartbeat sound signal applied to an earphone according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It should be understood that "inner" and "outer" in this application refer to the housing of the headset. The direction from the shell of the earphone to the internal circuit structure is inward, and the direction from the shell of the earphone to the internal circuit structure is outward otherwise; and not as a specific limitation on the device architecture of the present application.

It should be understood that the terms "first," "second," and the like, in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Along with the improvement of the living standard of the material, the attention of people to the self health is continuously promoted, so that the intelligent wearable equipment with the health management function is more and more widely used. Among the health management function that intelligent wearing equipment possessed, heartbeat detection is the function that the user relatively paid attention to.

Current intelligent wearing equipment (for example motion bracelet, motion wrist-watch) mainly adopt light sense detecting system to carry out heartbeat detection to the motion bracelet is the example, and the sensor in the motion bracelet sends the light beam to detect the absorbed quantity of blood to the light beam that sends, thereby carry out heartbeat detection to the user according to the absorbed quantity of light. That is, after the user wears the sports bracelet, the sports bracelet can beat the light beam on the skin. When the heart pumps blood, blood vessels are full of blood, the blood tends to absorb green light and reflect red light, so the heart can generate different colors of reflected light during contraction and relaxation, and the exercise bracelet can detect the heartbeat by monitoring the reflected light. It can be seen that want to effectively use the motion bracelet to carry out the heartbeat and detect, the user need correctly wear the motion bracelet, avoids the light leak and need guarantee to wear that department's blood is unobstructed. The relatively harsh wearing requirement causes that the reliability of the detection result is lower when the existing intelligent wearable device using the light sensation detection system performs heartbeat detection. In addition, the intelligent wearable equipment using the light sensation detection system is high in cost, and the endurance of the intelligent wearable equipment can be influenced by long-time use.

In order to solve the above problems, a purpose of fast and accurate heartbeat detection is achieved, the embodiment of the application provides an earphone, a microphone is arranged in the earphone to collect pressure signals of periodic changes in an ear canal caused by the beating of the skin of an inner ear along with the heart, the purpose of detecting heartbeat sound signals is achieved, the signal to noise ratio of the heartbeat sound signals collected by the microphone is improved, and therefore the accuracy of heartbeat sound signal detection is improved.

The type of headset is not limited by this application. For example, the headset mentioned in the present application may be a wired headset, and may also be a bluetooth headset (e.g., a True Wireless Stereo (TWS) headset); alternatively, the earphone may be an in-ear earphone or a half-in-ear earphone. Preferably, the headset of the present application may be a semi-in-ear headset.

Fig. 1 is a schematic structural diagram of an earphone according to an embodiment of the present application. As shown in fig. 1, the headset 100 includes a housing 110, a first microphone 120, a speaker 130, a second microphone 140, and a filter 150.

The housing 110 may be a one-piece housing or a detachable housing. The housing 110 has an interior cavity in which various electronic components may be disposed.

A first microphone 120 may be located on the housing 110 for collecting ambient noise signals. As one implementation, the first microphone 120 may be located on the housing 110 and in an inner cavity of the housing 110. If the first microphone 120 is disposed in the inner cavity of the housing 110, a microphone through hole 111 may be formed in the housing 110. The first microphone 120 corresponds to the microphone through hole 111 so that the first microphone 120 collects an external noise signal through the microphone through hole 111.

In some embodiments, the first microphone 120 may be a talking microphone. The existing communication microphone is used for collecting external noise signals, so that the cost can be saved.

The number of the first microphones 120 is not particularly limited in the present application. In some embodiments, only one first microphone 120 may be disposed on the housing 110. In other embodiments, at least two first microphones 120 may be disposed on the housing 110.

When at least two first microphones 120 are disposed on the housing 110, each first microphone 120 may be disposed at a different position of the housing 110. Meanwhile, microphone through holes 111 corresponding to each first microphone 120 may be respectively provided at different positions of the case 110, so that each first microphone 120 collects an external noise signal through the respective corresponding microphone through hole 111.

Speaker 130 may be located in an interior cavity of housing 110. The speaker 130 may be used to play audio signals, for example, when a user wears a headset to listen to music, after the audio signals in a music playing device (e.g., a mobile phone) are transmitted into the headset, the audio signals may be played through the speaker 130; alternatively, when the user wears the headset for voice call, an audio signal of the other party's speaking can be played through the speaker 130.

The second microphone 140 may be located in the inner cavity of the housing 110 at the position of the sound outlet of the earphone. The second microphone 140 may be used to acquire an initial heartbeat sound signal. Since other non-heartbeat sound signals may be collected by the second microphone 140 while the second microphone 140 collects heartbeat sound signals, other signals may be mixed in the initial heartbeat sound signal collected by the second microphone 140. For example, the initial heartbeat sound signal collected by the second microphone 140 may be mixed with an external noise signal and an audio signal played by a speaker.

The number of the second microphones 140 is not particularly limited in the present application. In some embodiments, the second microphone 140 may be a microphone array, i.e. the number of second microphones 140 may be at least two.

The filter 150 may be electrically connected to the first microphone 120 and the second microphone 140. The filter 150 may receive the ambient noise signal collected by the first microphone 120, the audio signal played by the speaker 130, and the initial heartbeat sound signal collected by the second microphone 140. After receiving the external noise signal, the audio signal, and the initial heartbeat sound signal, the filter 150 may filter the external noise signal and the audio signal from the initial heartbeat sound signal to obtain the target heartbeat sound signal.

The type and structure of the filter 150 is not particularly limited in this application. For example, the filter 150 may employ a band-pass filter to filter out the external noise signal and the audio signal in the initial heartbeat sound signal. Further, in designing the band-pass filter, the cutoff frequency of the band-pass filter may be designed based on the frequency range of the heartbeat sound signal.

Fig. 2 is a schematic structural diagram of a filter provided in an embodiment of the present application. As shown in fig. 2, the filter 150 may include a first estimation unit 151, a second estimation unit 152, and an adder unit 153.

Since the external noise signal and the audio signal played by the speaker will change along with the propagation path during the propagation process when entering the human ear, in order to more accurately calculate the external noise signal mixed in the initial heartbeat sound signal and the audio signal played by the speaker, the first estimation unit 151 and the second estimation unit 152 may be used to respectively simulate the corresponding estimation signals when the external noise signal and the audio signal played by the speaker reach the position of the second microphone 140.

For example, the first estimating unit 151 may be configured to obtain an estimated signal of the ambient noise signal according to a transfer function (referred to as a "primary path") corresponding to a transmission path from the first microphone 120 to the second microphone 140; the second estimating unit 152 may obtain an estimated signal of the audio signal according to a transfer function (referred to as a "secondary path") corresponding to a transmission path from the speaker 130 to the second microphone 140. For example, the first estimation unit 151 may be configured to obtain an estimation signal of the audio signal, and the second estimation unit 152 may be configured to obtain an estimation signal of the external noise signal.

As an implementation, the first estimating unit 151 may be configured to simulate the response of the primary path to the amplitude and phase of the signal with different frequencies, and the second estimating unit 152 may be configured to simulate the response of the secondary path to the amplitude and phase of the signal with different frequencies. From the simulation results of the first estimation unit 151 and the second estimation unit 152, estimation signals of the external noise signal and the audio signal can be obtained.

The first estimation unit 151 and the second estimation unit 152 may be physically separated or integrated into one estimation unit, and the functions of the first estimation unit 151 and the second estimation unit 152 are respectively performed by different modules.

The adder unit 153 may be electrically connected to the first estimation unit 151 and the second estimation unit 152 for adding and/or subtracting the received signals. For example, after the adder unit 153 receives the estimation signal of the external noise signal sent by the first estimation unit 151, the estimation signal of the audio signal sent by the second estimation unit 152, and the initial heartbeat sound signal collected by the second microphone 140, the estimation signal of the external noise signal and the estimation signal of the audio signal may be subtracted from the initial heartbeat sound signal to obtain the target heartbeat sound signal.

After the filter is used for filtering the external noise signal and the audio signal from the initial heartbeat sound signal collected by the second microphone, the signal-to-noise ratio of the obtained target heartbeat sound signal can be obviously improved, so that the accuracy of heartbeat sound signal detection can be improved. Based on the method, the obtained target heart beat sound signal can be utilized to perform processing such as heart beat sound waveform recording, heart rate index statistics and the like, so that a more accurate processing result can be obtained.

In some embodiments, after obtaining the target heartbeat sound signal within a period of time, the period of the target heartbeat sound signal may be detected according to the waveform of the target heartbeat sound signal within the period of time, for example, the period of the target heartbeat sound signal may be detected by using a threshold analysis method, a fourier analysis method, or the like. After the period of the target heartbeat sound signal is detected, the heart rate can be calculated according to the period, and then the heart rate index statistics is carried out.

Due to different wearing habits of different users or the influence of inherent errors of filter system parameters, after the estimation signal of the external noise signal and the estimation signal of the audio signal are subtracted from the initial heartbeat sound signal, the signal-to-noise ratio in the obtained target heartbeat sound signal is greatly improved, but partial external noise signal and the audio signal can still be mixed.

Therefore, in the embodiment of the present application, when there are at least two second microphones, the filter may filter the corresponding external noise signal and audio signal from the initial heartbeat sound signal collected by each second microphone, so as to obtain at least two heartbeat sound signals to be processed, where each heartbeat sound signal to be processed may still be mixed with part of the external noise signal and the audio signal. After the heartbeat sound signals to be processed are obtained, the filter can perform weighting processing on the heartbeat sound signals to be processed so as to further relatively attenuate the external noise signals and the audio signals mixed in the heartbeat sound signals to be processed, and thus the target heartbeat signal is obtained.

In the present application, relatively attenuating the external noise signal and the audio signal mixed in the heartbeat sound signal to be processed may refer to enhancing the heartbeat sound signal in the heartbeat sound signal to be processed to relatively attenuate the external noise signal and the audio signal mixed in the heartbeat sound signal to be processed; it may also refer to attenuating (or suppressing) the ambient noise signal and the audio signal in the heartbeat sound signal to be processed.

As an implementation, a beamformer may be used to perform weighting processing on the heartbeat acoustic signals to be processed. As shown in fig. 3, fig. 3 is a schematic structural diagram of an earphone according to another embodiment of the present application. In this embodiment, the headset 300 may include a housing 310, a first microphone 320, a speaker 330,

second microphones

341, 342, and a filter 350. The filter 350 may further include a beamformer 354, among other things.

The beamformer 354 may distinguish between signals from different directions, extract (or enhance) signals from certain directions, and cancel (or suppress) interfering signals from other directions, thereby performing filtering in the spatial domain.

In this application, the to-be-processed heartbeat sound signals corresponding to each second microphone may be respectively input into the beamformer 354, and the beamformer 354 performs weighting processing on each input to-be-processed heartbeat sound signal, so as to obtain the target heartbeat sound signal.

In some embodiments, the main lobe direction of the beamformer 354 may be directed in the ear and the null direction may be directed out of the ear. After the heartbeat sound signal to be processed is filtered by the beam former 354, the signal in the in-ear direction can be effectively enhanced, and the signal in the out-of-ear direction can be inhibited. That is, after being filtered by the beam former 354, the heartbeat sound signal from the in-ear direction can be effectively enhanced, and the external noise signal from the out-of-ear direction and the audio signal played by the speaker can be effectively suppressed.

The beam forming method used by the beam former 354 is not limited in the present application. For example, the beamformer 354 may perform weighting processing on the heartbeat acoustic signal to be processed by a delay-and-sum beamforming method; alternatively, the beamformer 354 may perform weighting processing on the heartbeat acoustic signal to be processed by filtering and adding.

The signals to be processed are weighted by the beam former, so that the signal to noise ratio of the obtained target heartbeat sound signal can be further improved, the influence caused by different wearing habits of users and inherent errors of different system parameters is eliminated, and the consistency of the heartbeat sound signal detected by the earphone is improved. Especially for half-in-ear earphones, because the earplug part of invading the auditory canal is not included in the structural design, the earphone does not have the capability of relatively fixing with the auditory canal, and the positions and postures of the ears of people at different users and different moments are different.

The headset provided by the present application may further comprise an in-ear detection unit (not shown in the figures). The in-ear detection unit can judge whether the earphone is in the ear according to the obtained target heartbeat sound signal.

As an implementation manner, the steps of performing the in-ear detection by using the in-ear detection unit in the embodiment of the present application may be referred to fig. 4.

In step S410, it is detected whether there is a target heartbeat sound signal.

In step S420, it is determined whether the earphone is in the ear. If the in-ear detection unit detects that the target heartbeat sound signal exists, determining that the earphone is in-ear; and if the in-ear detection unit detects that the target heartbeat sound signal does not exist, determining that the earphone is not in-ear.

In some embodiments, the in-ear detection unit may further determine the wearing tightness of the earphone according to the strength of the target heartbeat sound signal. Specifically, when the in-ear detection unit detects that a target heartbeat sound signal exists and the strength of the target heartbeat sound signal is greater than a certain threshold value, the wearing tightness of the earphone can be considered to be high; when the in-ear detection unit detects that the target heartbeat sound signal exists, but the strength of the target heartbeat sound signal is smaller than the threshold value, the wearing tightness of the earphone can be considered to be low.

Further, the earphone can perform corresponding tone quality equalization adjustment on the audio signal based on the wearing tightness. For example, when the wearing tightness of the earphone is high, the strength of the audio signal can be slightly reduced, and the influence of the too high strength of the audio signal on the hearing of the user is avoided; or when the wearing tightness of the earphone is low, the strength of the audio signal can be properly enhanced, and the user can normally enjoy music or normally talk; in addition, the method also comprises the step of determining the correction quantity of the current frequency response of the earphone compared with the optimal frequency response based on the current wearing tightness of the user, so that the corresponding tone quality balance adjustment is carried out on the audio signal to be played, the consistency of the optimal tone quality is ensured, and the user experience is improved.

When the tone quality of the audio signal is adjusted in a balanced manner based on the wearing tightness of the earphone, the secondary path changes along with the wearing state of the earphone by the user. Based on this, in some embodiments, the second estimation unit may be adjusted in real-time based on the audio signal.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an earphone according to another embodiment of the present application. The second estimation unit 552 may be determined online in an adaptive manner during the user usage phase.

As shown in fig. 5, the headset 500 may include a housing 510, a first microphone 520, a speaker 530, a second microphone 540, and a filter 550.

The filter 550 may include a first estimation unit 551, a second estimation unit 552, and a determination unit 554.

The determining unit 554 may determine the second estimating unit 552 based on the audio signal, the estimated signal of the audio signal and the initial heartbeat sound signal. As an implementation, the determining unit 554 may determine the second estimating unit 552 online in an adaptive manner.

When the second estimation unit 552 is determined online in an adaptive manner, an adaptive algorithm may be employed. The application does not limit the specific type of the adaptive algorithm, and for example, a Least Mean Square (LMS) algorithm may be used for adaptive iteration.

The device embodiments of the present application are described above in conjunction with fig. 1-5. A heartbeat sound detection method applied to an earphone according to an embodiment of the present application is described below with reference to fig. 6. For specific contents of each step in the method embodiments of the present application, reference may be made to related descriptions of the apparatus embodiments of the present application, which are not described herein again.

Fig. 6 is a schematic flow chart of a method for detecting a heartbeat sound signal applied to an earphone according to an embodiment of the present application. Referring to fig. 6, in steps 610 to 620, an ambient noise signal collected by a first microphone and an initial heartbeat sound signal collected by a second microphone are acquired.

In step 630, the external noise signal collected by the first microphone and the audio signal played by the speaker are filtered from the initial heartbeat sound signal, so as to obtain a target heartbeat sound signal.

As an implementation manner, the estimation signal of the external noise signal collected by the first microphone and the estimation signal of the audio signal played by the speaker may be subtracted from the initial heartbeat sound signal to obtain the target heartbeat sound signal.

In some embodiments, at least two second microphones may be adopted to collect the initial heartbeat sound signal, and the corresponding external noise signal and audio signal are filtered from the initial heartbeat sound signal collected by each second microphone, respectively, so as to obtain at least two heartbeat sound signals to be processed. Further, the at least two heartbeat sound signals to be processed may be weighted to further relatively attenuate the external noise signal and the audio signal, so as to obtain the target heartbeat sound signal.

Specifically, as an implementation manner, the at least two heartbeat sound signals to be processed may be weighted by a beamforming algorithm to obtain a target heartbeat sound signal.

The detection method applied to the heartbeat sound signal of the earphone can improve the signal to noise ratio of the obtained target heartbeat sound signal, so that the accuracy of heartbeat sound signal detection is improved.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments of the present application, it should be understood that the system, apparatus and method disclosed in the embodiments of the present application can be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and the division into the units as described is merely a logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. Additionally, the communication connections shown or discussed may be electrical, mechanical or otherwise.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An earphone, comprising:

a housing;

the first microphone is positioned on the shell and used for acquiring an external noise signal;

the loudspeaker is positioned in the inner cavity of the shell and used for playing audio signals;

the second microphone is positioned at the sound outlet of the earphone and used for acquiring an initial heartbeat sound signal;

and the filter is electrically connected with the first microphone and the second microphone and is used for filtering the external noise signal and the audio signal from the initial heartbeat sound signal to obtain a target heartbeat sound signal.

2. The headset of claim 1, wherein the filter comprises:

the first estimation unit is used for obtaining an estimation signal of the external noise signal according to a transfer function corresponding to a transmission path from the first microphone to the second microphone;

the second estimation unit is used for obtaining an estimation signal of the audio signal according to a transfer function corresponding to a transmission path from the loudspeaker to the second microphone;

and the adder unit is used for subtracting the estimation signal of the external noise signal and the estimation signal of the audio signal from the initial heartbeat sound signal to obtain the target heartbeat sound signal.

3. The headset of claim 1, wherein the second microphones are at least two, and wherein the filter is configured to:

respectively filtering corresponding external noise signals and audio signals from the initial heartbeat sound signals collected by each second microphone to obtain at least two heartbeat sound signals to be processed;

and weighting the at least two heartbeat sound signals to be processed so as to further relatively attenuate the external noise signal and the audio signal to obtain the target heartbeat sound signal.

4. The headset of claim 3, wherein the filter comprises a beamformer with main lobes directed in-ear and null directions directed out-of-ear, the beamformer being configured to:

and inputting the heartbeat sound signals to be processed corresponding to each second microphone into the beam former respectively for weighting processing to obtain the target heartbeat sound signals.

5. The headset of claim 1, wherein the headset is a semi-in-ear headset.

6. The headset of claim 1, wherein the filter is further configured to:

and obtaining a heartbeat sound signal waveform record and/or a heart rate index according to the target heartbeat sound signal.

7. The headset of claim 2, further comprising an in-ear detection unit,

the in-ear detection unit is used for judging whether the earphone is in the ear according to the target heartbeat sound signal: if the target heartbeat sound signal exists, determining that the earphone is in the ear; and if the target heartbeat sound signal does not exist, determining that the earphone is not inserted into the ear.

8. The earphone according to claim 7, wherein the in-ear detection unit is further configured to determine the wearing tightness of the earphone according to the strength of the target heartbeat sound signal; and the earphone carries out corresponding tone quality balance adjustment on the audio signal based on the compactness.

9. The headset of claim 8, wherein the filter is further configured to:

determining the second estimation unit based on the audio signal, the estimated signal of the audio signal and the initial heartbeat sound signal.

10. The headset of claim 1, wherein the second microphone is a microphone of the headset.