WO2023024345A1 - 耳机及其控制方法 - Google Patents

耳机及其控制方法 Download PDF

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Publication number
WO2023024345A1
WO2023024345A1 PCT/CN2021/138955 CN2021138955W WO2023024345A1 WO 2023024345 A1 WO2023024345 A1 WO 2023024345A1 CN 2021138955 W CN2021138955 W CN 2021138955W WO 2023024345 A1 WO2023024345 A1 WO 2023024345A1
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WIPO (PCT)
Prior art keywords
signal
filter
earphone
transparent
speaker
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PCT/CN2021/138955
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English (en)
French (fr)
Inventor
曲征
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Goertek Techology Co Ltd
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Goertek Techology Co Ltd
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Publication of WO2023024345A1 publication Critical patent/WO2023024345A1/zh
Priority to US18/428,766 priority Critical patent/US20240171896A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/02—Circuits for transducers for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation

Definitions

  • the present application relates to the technical field of earphones, in particular to an earphone and a control method thereof.
  • Transparency mode is a common function of earphones. Its purpose is to enable the wearer to hear the ambient sound outside the earphones without taking off the earphones.
  • the common solution to realize the transparent mode is to collect the external sound through the feed-forward microphone located outside the earphone shell, and process the collected signal accordingly, and then play it out by the speaker, so that the user can hear the external environment sound.
  • the main purpose of this application is to propose an earphone and its control method, which aims to overcome the problem of wind noise when the transparent mode of the existing earphone is applied in a windy scene, and realize that the earphone maintains a better transparent mode in a windy scene Effect.
  • the application proposes an earphone, the earphone includes: a housing, a speaker, a feedback microphone, a transparent filter and a fixed filter, the housing is provided with a sound chamber; the speaker is located in the In the sounding cavity; the feedback microphone is set in the sounding cavity; the transparent filter is set in the housing, the input end of the transparent filter is connected to the output end of the feedback microphone, and the The output end of the transparent filter is connected to the input end of the speaker; the fixed filter is arranged in the housing, the input end of the fixed filter is connected to the input end of the speaker, and the fixed filter The output terminal of is connected with the input terminal of the said transparent filter.
  • the earphone further includes: an adaptive filter, the adaptive filter is arranged in the housing, the input end of the adaptive filter is connected to the output end of the fixed filter, the The output end of the adaptive filter is connected with the input end of the transparent filter.
  • the present application also proposes a method for controlling an earphone, which is applied to the above-mentioned earphone, and the method for controlling the earphone includes the following steps:
  • a second source signal is determined according to the transparent audio signal and the music signal to be played, and the speaker is controlled to play audio according to the second source signal.
  • the echo cancellation signal is an inversion signal of the first source signal; or, the echo cancellation signal is an attenuated and inversion signal of the first source signal.
  • the step of determining the transparent audio signal according to the acquisition signal and the echo cancellation signal includes:
  • the first superposition signal is amplified by the transparent filter to obtain the transparent audio signal.
  • the earphone also includes an adaptive filter, and the step of determining the transparent audio signal according to the collected signal and the echo cancellation signal includes:
  • the second superposition signal is amplified by the transparent filter to obtain the transparent audio signal.
  • the step of compensating the echo cancellation signal through the adaptive filter to obtain a modified signal includes:
  • the echo cancellation signal is compensated according to the adjusted transfer function to obtain the modified signal.
  • step of calculating the correlation between the first source signal and the collected signal it further includes:
  • the echo cancellation signal is compensated according to the transfer function of the adaptive filter to obtain the modified signal.
  • the method further includes:
  • a transfer function of the fixed filter is determined according to the first frequency sweep signal and the first feedback signal.
  • the method further includes:
  • a transfer function of the adaptive filter is determined based on a difference between the test transfer function and the transfer function of the fixed filter.
  • the present application also proposes an earphone, the earphone includes a memory, a processor and a computer program stored in the memory and operable on the processor, the computer program is controlled by the processor During execution, the steps of the above-mentioned earphone control method are realized.
  • the present application also proposes a storage medium, on which a control program of an earphone is stored, and when the control program of the earphone is executed by a processor, the steps of the above-mentioned earphone control method are realized.
  • the feedback microphone located in the sound cavity of the earphone picks up the sound (including the external ambient sound passing through the housing and the sound from the speaker) and converts it into a collection signal and transmits it to the input end of the transparent filter, and passes through a fixed
  • the filter inverts the first source signal input to the speaker and leads it to the input end of the transparent filter, so that the echo signal in the collected signal picked up by the feedback microphone is canceled, so that only the current moment enters the transparent filter.
  • the electrical signal converted from the external ambient sound of the shell is amplified by a transparent filter, and then input to the speaker together with the music signal to be played, and the music and the external ambient sound are played by the speaker, so that the user can hear the music At the same time, the ambient sound of the outside world can be clearly heard.
  • the feedback microphone is set in the sound chamber of the earphone, it is free from wind noise interference, so it can solve the problem of wind noise noise in the application of the strong wind scene while maintaining a better transparent mode effect.
  • the corresponding echo processing can overcome the problems of music quality variation and howling.
  • FIG. 1 is a schematic diagram of a hardware structure of an earphone according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of the signal flow of the earphone according to the embodiment of the present application.
  • FIG. 3 is a schematic flowchart of the first embodiment of the earphone control method of the present application.
  • FIG. 4 is a schematic flowchart of the detailed steps of step S300 in the second embodiment of the earphone control method of the present application;
  • FIG. 5 is a schematic flowchart of the detailed steps of step S300 in the third embodiment of the earphone control method of the present application;
  • FIG. 6 is a schematic flowchart of the detailed steps of step S330 in the fourth embodiment of the earphone control method of the present application.
  • FIG. 7 is a schematic flowchart of the detailed steps of step S330 in the fifth embodiment of the earphone control method of the present application.
  • FIG. 8 is a schematic flowchart of a sixth embodiment of the headset control method of the present application.
  • FIG. 9 is a schematic flowchart of a seventh embodiment of a method for controlling an earphone according to the present application.
  • FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment involved in the solution of the embodiment of the present application.
  • the solution of the embodiment of the present application relates to an earphone, and the earphone includes: a processor 1001 , such as a CPU, a memory 1002 , and a communication bus 1003 .
  • the communication bus 1003 is used to realize connection and communication between these components.
  • the memory 1002 can be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. As shown in FIG. 1, the memory 1002 as a computer storage medium may include a control program of the earphone; and the processor 1001 may be used to call the control program of the earphone stored in the memory 1002, and perform the following operations:
  • a second source signal is determined according to the transparent audio signal and the music signal to be played, and the speaker is controlled to play audio according to the second source signal.
  • processor 1001 may be used to call the earphone control application program stored in the memory 1002, and perform the following operations:
  • the first superposition signal is amplified by the transparent filter to obtain the transparent audio signal.
  • processor 1001 may be used to call the earphone control application program stored in the memory 1002, and perform the following operations:
  • the second superposition signal is amplified by the transparent filter to obtain the transparent audio signal.
  • processor 1001 may be used to call the earphone control application program stored in the memory 1002, and perform the following operations:
  • the echo cancellation signal is compensated according to the adjusted transfer function to obtain the modified signal.
  • processor 1001 may be used to call the earphone control application program stored in the memory 1002, and perform the following operations:
  • the echo cancellation signal is compensated according to the transfer function of the adaptive filter to obtain the modified signal.
  • processor 1001 may be used to call the earphone control application program stored in the memory 1002, and perform the following operations:
  • a transfer function of the fixed filter is determined according to the first frequency sweep signal and the first feedback signal.
  • processor 1001 may be used to call the earphone control application program stored in the memory 1002, and perform the following operations:
  • a transfer function of the adaptive filter is determined based on a difference between the test transfer function and the transfer function of the fixed filter.
  • the earphone includes: a housing, a speaker 10, a feedback microphone 20, a transparent filter 30 and a fixed filter 40, and the housing is provided with a sound cavity;
  • the loudspeaker 10 is arranged in the sounding chamber;
  • the feedback microphone 20 is arranged in the sounding chamber;
  • the transparent filter 30 is arranged in the housing, and the input end of the transparent filter 30 is connected to the The output end of the feedback microphone 20 is connected, and the output end of the transparent filter 30 is connected with the input end of the speaker 10;
  • the fixed filter 40 is arranged in the housing, and the input end of the fixed filter 40 It is connected with the input end of the speaker 10 , and the output end of the fixed filter 40 is connected with the input end of the transparent filter 30 .
  • the housing of the earphone is provided with a sounding cavity
  • the speaker 10 and the feedback microphone 20 are installed in the sounding cavity
  • the transparent filter 30 and the fixed filter 40 can be integrated on the main control circuit board and connected with the main control circuit board.
  • the processor on the circuit board is electrically connected
  • the main control circuit board is installed inside the housing
  • the main control circuit board is electrically connected to the speaker 10 and the feedback microphone 20 through wires.
  • the earphone type of this application can be a wired earphone or a wireless earphone.
  • the processor obtains the music signal from the audio source device through the earphone cable.
  • the processor acquires the music signal from the audio source device through the Bluetooth module. .
  • the earphone of the present application has a transparent mode function, and its working principle is: the feedback microphone 20 located in the sound chamber of the earphone picks up the ambient sound attenuated by the casing and converts it into an electrical signal, and passes the electrical signal through a transparent filter. After being amplified by the amplifier 30, the music signal received from the audio source device is input to the speaker 10 together, and the music and the external ambient sound are played by the speaker 10, so that the user can clearly hear the external ambient sound while listening to the music .
  • the feedback microphone 20 and the speaker 10 are both in the sounding chamber, the feedback microphone 20 will not only pick up the ambient sound attenuated by the housing, but also pick up the sound played by the speaker 10 at the same time.
  • the sound played by the speaker 10 includes two parts: one is music, and the other is the sound amplified by the transparent filter 30 from the ambient sound picked up by the microphone 20 at the previous moment. Neither of these two parts should be picked up and processed by the feedback microphone 20 , otherwise the music quality will change and the robustness of the transparent mode will deteriorate, resulting in howling.
  • the present application sets a fixed filter 40 between the input end of the loudspeaker 10 and the input end of the transparent filter 30, and leads the first source signal input to the loudspeaker 10 to the input end of the transparent filter 30 after being inverted.
  • the signals of the above two echoes are cancelled, so that only the electrical signal converted from the external ambient sound entering through the shell at the current moment enters the transparent filter 30, thereby overcoming the change in music quality and the Howling problem.
  • the acquisition signal (electrical signal c) picked up by the feedback microphone 20 includes three parts: the electrical signal converted from the external ambient sound at the current moment, and the electrical signal converted from the sound played by the loudspeaker 10.
  • Electrical signal including the electrical signal converted from the music at the previous moment, and the electrical signal converted from the ambient sound picked up by the feedback microphone 20 and amplified by the pass-through filter 30 at the previous moment.
  • the input terminal of the fixed filter 40 receives the first source signal (electrical signal a) input to the speaker 10 at the previous moment from the input terminal of the speaker 10, and the first source signal (electrical signal a) includes the signal source signal at the previous moment.
  • the music signal and the transparent audio signal at the previous moment, the output of the fixed filter 40 is an echo cancellation signal (electrical signal b), and the echo cancellation signal (electrical signal b) can be the first source signal (electrical signal a ), that is, the electrical signal b is equal in value to the electrical signal a.
  • the relationship between the first source signal (electrical signal a) and the acquisition signal (electrical signal c) is: the first source signal (electrical signal a) is broadcasted by the speaker 10 to form music at the previous moment and transparent sound at the previous moment. , the music at the previous moment and the transparent sound at the previous moment together with the ambient sound at the current moment are picked up by the feedback microphone 20 to obtain a collection signal (electrical signal c). At the same time, the first source signal (electrical signal a) is input to the fixed filter 40, and the phase inversion operation is performed to obtain the echo cancellation signal (electrical signal b).
  • the acquisition signal (electrical signal c) and the echo cancellation signal (electrical signal b ) are superimposed and input to the transparent filter 30, since the echo cancellation signal (electrical signal b) and the first source signal (electrical signal a) have an equal value and reverse phase, the acquisition signal (electrical signal c) and the echo cancellation signal (electrical signal b ) superimposed, only the electrical signal converted from the ambient sound at the current moment enters the transparent filter 30, and is amplified by the transparent filter 30 to form a transparent audio signal at the current moment and input to the speaker 10.
  • the music at the current moment The signals are input into the speaker 10 together, so that the ambient sound at the current moment and the music at the present moment can be played through the speaker 10 to realize the transparent mode effect.
  • the echo cancellation signal can be the antiphase signal of the attenuated first source signal, and the antiphase signal of the first source signal is attenuated as the echo cancellation signal, mainly considering that the signal is input into the speaker 10 and passed through the speaker After 10 is played, when it is picked up by the feedback microphone 20, the signal is attenuated.
  • the degree of attenuation can be determined by testing, and the transfer function of the fixed filter 30 can be determined with reference to this factor, so that the echo cancellation signal output by the fixed filter 30 can accurately cancel the echo signal in the signal collected by the feedback microphone 20 .
  • the sound is picked up by the feedback microphone 20 , and after corresponding echo processing, the external ambient sound is amplified by the transparent filter 30 so as to be captured by the human ear. Since the feedback microphone 20 is set in the sounding cavity of the earphone, it is not disturbed by wind noise, so it can solve the problem of wind noise in the application of strong wind scene while maintaining a better effect of the transparent mode.
  • the earphone also includes: an adaptive filter 50, the adaptive filter 50 is arranged in the housing, the input end of the adaptive filter 50 is connected to the fixed filter 40 is connected to the output end, and the output end of the adaptive filter 50 is connected to the input end of the transparent filter 30 .
  • an adaptive filter 50 is added between the output end of the fixed filter 40 and the input end of the transparent filter 30, and the speaker 10 to the feedback microphone 20 of each product can be tested in the production line test link.
  • the difference between the transfer function of the test transfer function after inversion and the transfer function determined by the fixed filter 40 is calculated, and the difference is fitted by the adaptive filter 50 . In this way, when each product is working, it can ensure that the echo signal in the collected signal is completely offset.
  • the present application proposes a first embodiment of a method for controlling an earphone.
  • the method for controlling the earphone includes the following steps:
  • the shell of the earphone is provided with a sounding cavity, and the speaker and the feedback microphone are installed in the sounding cavity, and the transparent filter and the fixed filter can be integrated on the main control circuit board and connected with the main control circuit board.
  • the processor on the circuit board is electrically connected, the main control circuit board is installed inside the housing, and the main control circuit board is electrically connected to the speaker and the feedback microphone through wires.
  • the earphone type of this application can be a wired earphone or a wireless earphone. When it is a wired earphone, the processor obtains the music signal from the audio source device through the earphone cable. When it is a wireless earphone, the processor acquires the music signal from the audio source device through the Bluetooth module. .
  • the earphone of the present application has a transparent mode function, and its working principle is: the feedback microphone located in the sound chamber of the earphone picks up the ambient sound attenuated by the shell and converts it into an electrical signal, and passes the electrical signal through the transparent filter After amplification, the music signal received from the audio source device is input to the speaker, and the music and the external environment sound are played by the speaker, so that the user can clearly hear the external environment sound while listening to the music.
  • the feedback microphone since the feedback microphone and the speaker are both in the sounding cavity, the feedback microphone not only picks up the external ambient sound after being attenuated by the shell, but also picks up the sound played by the speaker at the same time.
  • the sound played by the speaker includes two parts: one is music, and the other is the sound amplified by the transparent filter of the ambient sound picked up by the feedback microphone at the previous moment. Neither of these two parts should be picked up and processed by the feedback microphone, otherwise it will cause changes in music quality and poor robustness of the transparency mode, resulting in howling.
  • the present application sets a fixed filter between the input end of the speaker and the input end of the transparent filter, inverts the first source signal input to the speaker and leads it to the input end of the transparent filter, and picks up the signal in the feedback microphone.
  • the above two redundant signals are cancelled, so that only the electrical signal converted from the external ambient sound entering through the shell at the current moment enters the transparent filter, thereby overcoming the problems of music quality changes and howling.
  • the acquisition signal (electrical signal c) picked up by the feedback microphone includes three parts: the electrical signal converted from the external ambient sound at the current moment, and the electrical signal converted from the sound played by the speaker : Including the electrical signal converted from music at the previous moment, and the electrical signal converted from the ambient sound picked up by the feedback microphone and amplified by the transparent filter at the previous moment.
  • the input terminal of the fixed filter receives the first source signal (electrical signal a) inputted into the speaker at the previous moment from the input terminal of the loudspeaker, and the first source signal (electrical signal a) includes the music signal at the previous moment and
  • the output terminal of the fixed filter is an echo cancellation signal (electrical signal b), and the echo cancellation signal (electrical signal b) can be the inversion of the first source signal (electrical signal a)
  • the signal, that is, the electrical signal b and the electrical signal a are equal in value and inverted.
  • the relationship between the first source signal (electrical signal a) and the acquisition signal (electrical signal c) is: after the first source signal (electrical signal a) is broadcast by the speaker, it forms the music at the previous moment and the transparent sound at the previous moment, The music at the previous moment, the transparent sound at the previous moment, and the ambient sound at the current moment are picked up by the feedback microphone to obtain a collection signal (electrical signal c).
  • the first source signal (electrical signal a) is input to the fixed filter, and the phase inversion operation is performed to obtain the echo cancellation signal (electrical signal b), and then, the acquisition signal (electrical signal c) and the echo cancellation signal (electrical signal b) After superimposition, it is input to the transparent filter.
  • the acquisition signal (electrical signal c) and the echo cancellation signal (electrical signal b) are superimposed Finally, only the electrical signal converted from the ambient sound at the current moment enters the transparent filter, and is amplified by the transparent filter to form a transparent audio signal at the current moment and input to the speaker.
  • the music signal to be played (the Music signal) is input to the speaker together, so that the ambient sound and the music at the current moment can be played through the speaker to achieve the transparent mode effect.
  • the echo cancellation signal can be the antiphase signal of the first source signal after attenuation, and the antiphase signal of the first source signal is attenuated as the echo cancellation signal, mainly considering that the signal is input into the speaker and played through the speaker After that, when picked up by the feedback microphone, the signal is attenuated.
  • the degree of attenuation can be determined through testing, and the transfer function of the fixed filter can be determined with reference to this factor, so that the echo cancellation signal output by the fixed filter can accurately cancel the echo signal in the collected signal fed back to the microphone.
  • the sound is picked up by the feedback microphone, and after corresponding echo processing, the external ambient sound is amplified by the transparent filter, so that it is captured by the human ear.
  • the feedback microphone is set in the sound chamber of the earphone, it is not interfered by wind noise, so it can solve the problem of wind noise and noise in the application of strong wind scene while maintaining a better transparent mode effect.
  • the present application proposes a second embodiment of an earphone control method. Based on the first embodiment, the step S300 includes:
  • S320 Amplify the first superposition signal by using the transparent filter to obtain the transparent audio signal.
  • the echo cancellation signal formed by the fixed filter is input into the transparent filter.
  • the acquisition signal picked up by the microphone is superimposed first. After the two are superimposed, the echo signal contained in the acquisition signal can be canceled out, so that only the electrical signal converted from the external ambient sound at the current moment is input into the transparent filter, and then amplified by the transparent filter.
  • a transparent audio signal is formed, then input to the speaker, and then the music signal at the current moment is input to the speaker together, so that the ambient sound at the current moment and the music at the current moment can be played through the speaker to achieve the transparent mode effect.
  • the present application proposes a third embodiment of an earphone control method. Based on the first embodiment, the step S300 includes:
  • an adaptive filter is added between the output end of the fixed filter and the input end of the transparent filter.
  • the transfer function from the speaker to the feedback microphone of each product can be tested and the test transfer function after inversion is calculated, and the difference between the fixed transfer function of the fixed filter is calculated, and the adaptive filter is used to The difference is fitted.
  • the fixed filter inputs the echo cancellation signal formed by processing the first source signal input to the speaker at the previous moment into the adaptive filter, and the echo cancellation signal is compensated by the adaptive filter. Finally, the corrected correction signal can be obtained.
  • the correction signal is superimposed with the acquisition signal picked up by the feedback microphone, it can ensure that the echo signal in the acquisition signal is completely canceled, so that only the electrical signal input channel of the external environmental sound conversion at the current moment filter. In this way, a better transparent mode effect can be achieved and better music quality can be guaranteed.
  • the present application proposes a fourth embodiment of a method for controlling an earphone. Based on the third embodiment, the step S330 includes:
  • the transfer function of the filter can be dynamically adjusted through correlation calculation every time the earphone is used.
  • a correlation calculation is first performed on the first source signal input to the speaker and the collected signal output by the feedback microphone.
  • the so-called correlation calculation refers to the study of the relationship between two or more signals in signal analysis.
  • the signal waveform sent by the transmitting end (such as the horn of this embodiment) is known, and the signal (or callback) at the receiving end (such as the feedback microphone of this embodiment) Signal), judge whether there are signals sent by the sender, and use their similarity or dependence to make a judgment.
  • the result of the correlation is between 0 and 1, and the smaller the correlation (closer to 0), it means that there are fewer signals at the transmitting end in the signal at the receiving end, and vice versa, the greater the correlation (closer to 1), Indicates that there are more transmitter signals in the receiver signal.
  • the transfer function of the adaptive filter can be adjusted accordingly, so that the transfer function of the adaptive filter
  • the function can accurately compensate the transfer function of the fixed filter to ensure that the echo signal in the collected signal is completely canceled after the correction signal output by the adaptive filter is superimposed on the collected signal picked up by the feedback microphone. In this way, a better transparent mode effect can be achieved and better music quality can be guaranteed.
  • the present application proposes a fifth embodiment of an earphone control method. Based on the fourth embodiment, after the step S331, it also includes:
  • a specific adjustment range that is, a preset threshold of the correlation, such as 0.05, may be set. Comparing the correlation calculation result between the first source signal and the collected signal with a preset threshold, when the calculated correlation result is greater than the preset threshold, it indicates that there are still more first source signals in the collected signal, At this time, it is necessary to adjust the transfer function of the adaptive filter; then, calculate the correlation between the first source signal and the collected signal again, and judge the size of the correlation result and the preset threshold again, if the correlation result is greater than the preset threshold If the threshold is set, it is still necessary to continue to adjust the transfer function of the adaptive filter, and this cycle is repeated until the correlation result is less than or equal to the preset threshold before reaching the standard.
  • a preset threshold of the correlation such as 0.05
  • the adaptive filter will first calculate the first correlation of the original signal, then take an adjustment value, and calculate the second correlation after the signal changes, according to the first correlation and the second correlation and the adjusted value , to calculate what the next adjustment value should be, and through continuous iteration of the above operations, it can gradually approach the optimal solution.
  • one indicator of adaptive filter adjustment is the step size (adjustment size) of each adjustment. The larger the step size, the faster the iteration and the reduced number of iterations, but the accuracy is poor, so it can be reduced by reducing Adjust the step size to improve the adjustment accuracy.
  • the specific method of correlation calculation can adopt the existing technology in this field, and will not be repeated here.
  • the operation of determining the adjustment direction of the transfer function of the adaptive filter through the method of correlation calculation can be performed synchronously while the earphone is working, and will not interfere with the normal use of the earphone by the user, so it will not affect the user's use of the earphone.
  • Experience makes a difference.
  • the setting of the fixed filter is necessary, and the adaptive filter is fine-tuned on the basis of the fixed filter.
  • the required transfer function can be determined by continuous adjustment through correlation calculation, if only the adaptive filter is used, the adjustment range of the adaptive filter is relatively large, the required adjustment time is also long, and the adjustment accuracy will be reduced. restricted.
  • the present application proposes a sixth embodiment of an earphone control method. Based on all the above-mentioned embodiments, before the step S100, it also includes:
  • a uniform fixed filter transfer function can be determined for all earphone products of the same type.
  • the fixed filter is the transfer function from the horn to the feedback microphone and operates inversely.
  • the test method of the transfer function from the speaker to the feedback microphone is: feed the first frequency sweep signal to the speaker (the frequency sweep signal refers to an equal-amplitude signal whose frequency changes periodically within a certain range, and the frequency sweep signal is designed for testing , it is mainly used to test the frequency characteristics of components, devices, and the whole machine), test the output of the feedback microphone end, calculate the amplitude and phase difference between the output and input, that is, obtain the transfer function from the speaker to the feedback microphone, and then reverse the transfer function Phase operation (that is, phase inversion 180°), that is, the transfer function of the fixed filter is obtained.
  • the frequency sweep signal refers to an equal-amplitude signal whose frequency changes periodically within a certain range, and the frequency sweep signal is designed for testing , it is mainly used to test the frequency characteristics of components, devices, and the whole machine
  • test the output of the feedback microphone end calculate the amplitude and phase difference between the output and input, that is, obtain the transfer function from the speaker to the feedback microphone, and then reverse the transfer function Phase operation (
  • the present application proposes a seventh embodiment of an earphone control method, based on all the above-mentioned embodiments, before the step S100, it also includes:
  • S105 Determine the transfer function of the adaptive filter according to the difference between the test transfer function and the transfer function of the fixed filter.
  • each earphone product in the product testing stage, each earphone product can be tested and the transfer function of the adaptive filter of each product can be preset to complete the calibration operation for each product.
  • the method is still to test the transfer function from the speaker to the feedback microphone: feed the second sweep signal to the speaker, test the output of the feedback microphone, and calculate the amplitude and phase difference between the output and input, that is, to obtain the actual signal from the speaker to the feedback microphone of each product.
  • Transfer function after inverting the actual transfer function, the exact transfer function that should be set under the theoretical state of the fixed filter can be determined, and the difference between the exact transfer function and the transfer function of the fixed fixed filter , which is determined as the transfer function of the adaptive filter.
  • Compensating and correcting the fixed filter through the adaptive filter can ensure that the echo signal in the collected signal is completely canceled after the correction signal output by the adaptive filter is superimposed on the collected signal picked up by the feedback microphone. In this way, a better transparent mode effect can be achieved and better music quality can be guaranteed.
  • the present application also proposes an earphone, the earphone includes a memory, a processor and a computer program stored in the memory and operable on the processor, the computer program is controlled by the processor During execution, the steps of the above-mentioned earphone control method are realized.
  • the present application also proposes a storage medium, on which a control program of an earphone is stored, and when the control program of the earphone is executed by a processor, the steps of the above-mentioned earphone control method are realized.
  • the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation.
  • the technical solution of the present application can be embodied in the form of a software product in essence or the part that contributes to the prior art, and the computer software product is stored in a storage medium as described above (such as ROM/RAM , magnetic disk, optical disk), including several instructions to make a terminal air conditioner (which can be a mobile phone, a computer, a server, an air conditioner, or a network air conditioner, etc.) execute the methods described in various embodiments of the present application.
  • a terminal air conditioner which can be a mobile phone, a computer, a server, an air conditioner, or a network air conditioner, etc.

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Abstract

本申请公开一种耳机及其控制方法，其中，所述耳机包括：壳体、喇叭、反馈麦克风、通透滤波器以及固定滤波器，所述壳体设有发声腔；所述喇叭设于所述发声腔内；所述反馈麦克风设于所述发声腔内；所述通透滤波器设于所述壳体内，所述通透滤波器的输入端与所述反馈麦克风的输出端连接，所述通透滤波器的输出端与所述喇叭的输入端连接；所述固定滤波器设于所述壳体内，所述固定滤波器的输入端与所述喇叭的输入端连接，所述固定滤波器的输出端与所述通透滤波器的输入端连接。本申请技术方案能够克服现有耳机通透模式在大风场景下应用时带有风噪的问题，实现耳机在大风场景下保有较佳通透模式的效果。

Description

耳机及其控制方法
本申请要求于2021年08月23日提交中国专利局、申请号202110972502.0、申请名称为“耳机及其控制方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及耳机技术领域，特别涉及一种耳机及其控制方法。
背景技术
通透模式是耳机的一种常用功能，其目的是使佩戴者能在不摘下耳机的状态下，听清楚耳机外部的环境声音。其中，实现通透模式的常用方案是：通过位于耳机壳体外的前馈麦克风采集外界声音，并对采集的信号进行相应处理后，再由喇叭播放出来，如此，用户便能听到外界的环境声音。
但是，当在大风场景下使用通透模式时，由于位于耳机壳体外的前馈麦克风会拾取到大量风噪，导致喇叭在播出外界环境声的同时，还会播出大量多余的风噪声，从而造成用户的体验感极差。
发明内容
本申请的主要目的是提出一种耳机及其控制方法，旨在克服现有耳机通透模式在大风场景下应用时带有风噪的问题，实现耳机在大风场景下保有较佳通透模式的效果。
为实现上述目的，本申请提出一种耳机，所述耳机包括：壳体、喇叭、反馈麦克风、通透滤波器以及固定滤波器，所述壳体设有发声腔；所述喇叭设于所述发声腔内；所述反馈麦克风设于所述发声腔内；所述通透滤波器设于所述壳体内，所述通透滤波器的输入端与所述反馈麦克风的输出端连接，所述通透滤波器的输出端与所述喇叭的输入端连接；所述固定滤波器设于所述壳体内，所述固定滤波器的输入端与所述喇叭的输入端连接，所述固定滤波器的输出端与所述通透滤波器的输入端连接。
可选地，所述耳机还包括：自适应滤波器，所述自适应滤波器设于所述壳体内，所述自适应滤波器的输入端与所述固定滤波器的输出端连接，所述自适应滤波器的输出端与所述通透滤波器的输入端连接。
为实现上述目的，本申请还提出一种耳机的控制方法，应用于如上所述耳机，所述耳机的控制方法包括以下步骤：
获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号；
根据所述第一信源信号，通过所述固定滤波器生成回声抵消信号；
根据所述采集信号及所述回声抵消信号确定通透音频信号；
根据所述通透音频信号及待播放音乐信号确定第二信源信号，并根据所述第二信源信号控制所述喇叭播放音频。
进一步地，所述回声抵消信号为所述第一信源信号的反相信号；或者，所述回声抵消信号为所述第一信源信号经衰减并经反相后形成的信号。
进一步地，所述根据所述采集信号及所述回声抵消信号确定通透音频信号的步骤包括：
将所述采集信号和所述回声抵消信号叠加，得到第一叠加信号；
通过所述通透滤波器对所述第一叠加信号进行放大，得到所述通透音频信号。
进一步地，所述耳机还包括自适应滤波器，所述根据所述采集信号及所述回声抵消信号确定通透音频信号的步骤包括：
通过所述自适应滤波器对所述回声抵消信号进行补偿，得到修正信号；
将所述采集信号和所述修正信号叠加，得到第二叠加信号；
通过所述通透滤波器对所述第二叠加信号进行放大，得到所述通透音频信号。
进一步地，所述通过所述自适应滤波器对所述回声抵消信号进行补偿，得到修正信号的步骤包括：
计算所述第一信源信号与所述采集信号之间的相关性；
在所述相关性大于预设阈值时，调整所述自适应滤波器的传递函数；
根据调整后的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
进一步地，所述计算所述第一信源信号与所述采集信号之间的相关性的步骤之后，还包括：
在所述相关性小于或等于所述预设阈值时，根据所述自适应滤波器的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
进一步地，所述获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号的步骤之前，还包括：
向所述喇叭馈入第一扫频信号，并获取所述反馈麦克风采集的第一反馈信号；
根据所述第一扫频信号和所述第一反馈信号，确定所述固定滤波器的传递函数。
进一步地，所述获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号的步骤之前，还包括：
向所述喇叭馈入第二扫频信号，并获取所述反馈麦克风采集的第二反馈信号；
根据所述第二扫频信号和所述第二反馈信号，计算测试传递函数；
根据所述测试传递函数和所述固定滤波器的传递函数之间的差值，确定所述自适应滤波器的传递函数。
为实现上述目的，本申请还提出一种耳机，所述耳机包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如上所述的耳机控制方法的步骤。
为实现上述目的，本申请还提出一种存储介质，所述存储介质上存储有耳机的控制程序，所述耳机的控制程序被处理器执行时实现如上所述的耳机控制方法的步骤。
本申请技术方案中，由位于耳机发声腔内的反馈麦克风拾取声音(包括经过壳体的外界环境声以及喇叭发出的声音)并转化为采集信号传输至通透滤波器的输入端，并通过固定滤波器将输入喇叭的第一信源信号反相后引至通透滤波器的输入端，使反馈麦克风拾取的采集信号中的回声信号被抵消，使得进入通透滤波器的只有当前时刻穿透外壳的外部环境声转化的电信号，并通过通透滤波器进行放大后，与待播放的音乐信号一同输入喇叭，由喇叭播放出音乐和外界环境声，如此，用户便能在听到音乐的同时，清楚地听到外界的环境声。由于反馈麦克风设置于耳机的发声腔内，不受风噪干扰，故可以在保有较佳通透模式效果的情况下很好的解决大风场景应用中的风噪杂音问题，其中通过固定滤波器进行相应的回声处理，能够克服音乐质量变化和啸叫问题。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本申请实施例的耳机硬件结构示意图；
图2为本申请实施例的耳机的信号流向示意图；
图3为本申请耳机控制方法第一实施例的流程示意图；
图4为本申请耳机控制方法第二实施例中步骤S300的细化步骤的流程示意图；
图5为本申请耳机控制方法第三实施例步骤S300的细化步骤的流程示意图；
图6为本申请耳机控制方法第四实施例步骤S330的细化步骤的流程示意图；
图7为本申请耳机控制方法第五实施例步骤S330的细化步骤的流程示意图；
图8为本申请耳机控制方法第六实施例的流程示意图；
图9为本申请耳机控制方法第七实施例的流程示意图。
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于 本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明，若本申请实施例中有涉及方向性指示(诸如上、下、左、右、前、后……)，则该方向性指示仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，若本申请实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
如图1所示，图1是本申请实施例方案涉及的硬件运行环境的终端结构示意图。
本申请实施例方案涉及的是耳机，耳机包括：处理器1001，例如CPU，存储器1002，通信总线1003。其中，通信总线1003用于实现这些组件之间的连接通信。
存储器1002可以是高速RAM存储器，也可以是稳定的存储器(non-volatilememory)，例如磁盘存储器。如图1所示，作为一种计算机存储介质的存储器1002中可以包括耳机的控制程序；而处理器1001可以用于调用存储器1002中存储的耳机的控制程序，并执行以下操作：
获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号；
根据所述第一信源信号，通过所述固定滤波器生成回声抵消信号；
根据所述采集信号及所述回声抵消信号确定通透音频信号；
根据所述通透音频信号及待播放音乐信号确定第二信源信号，并根据所述第二信源信号控制所述喇叭播放音频。
进一步地，处理器1001可以用于调用存储器1002中存储的耳机的控制应用程序，并执行以下操作：
将所述采集信号和所述回声抵消信号叠加，得到第一叠加信号；
通过所述通透滤波器对所述第一叠加信号进行放大，得到所述通透音频信号。
进一步地，处理器1001可以用于调用存储器1002中存储的耳机的控制应用程序，并执行以下操作：
通过所述自适应滤波器对所述回声抵消信号进行补偿，得到修正信号；
将所述采集信号和所述修正信号叠加，得到第二叠加信号；
通过所述通透滤波器对所述第二叠加信号进行放大，得到所述通透音频信号。
进一步地，处理器1001可以用于调用存储器1002中存储的耳机的控制应用程序，并执行以下操作：
计算所述第一信源信号与所述采集信号之间的相关性；
在所述相关性大于预设阈值时，调整所述自适应滤波器的传递函数；
根据调整后的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
进一步地，处理器1001可以用于调用存储器1002中存储的耳机的控制应用程序，并执行以下操作：
在所述相关性小于或等于所述预设阈值时，根据所述自适应滤波器的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
进一步地，处理器1001可以用于调用存储器1002中存储的耳机的控制应用程序，并执行以下操作：
向所述喇叭馈入第一扫频信号，并获取所述反馈麦克风采集的第一反馈信号；
根据所述第一扫频信号和所述第一反馈信号，确定所述固定滤波器的传递函数。
进一步地，处理器1001可以用于调用存储器1002中存储的耳机的控制应用程序，并执行以下操作：
向所述喇叭馈入第二扫频信号，并获取所述反馈麦克风采集的第二反馈信号；
根据所述第二扫频信号和所述第二反馈信号，计算测试传递函数；
根据所述测试传递函数和所述固定滤波器的传递函数之间的差值，确定所述自适应滤波器的传递函数。
在本申请实施例中，如图2所示，所述耳机包括：壳体、喇叭10、反馈麦克风20、通透滤波器30以及固定滤波器40，所述壳体设有发声腔；所述喇叭10设于所述发声腔内；所述反馈麦克风20设于所述发声腔内；所述通透滤波器30设于所述壳体内，所述通透滤波器30的输入端与所述反馈麦克风20的输出端连接，所述通透滤波器30的输出端与所述喇叭10的 输入端连接；所述固定滤波器40设于所述壳体内，所述固定滤波器40的输入端与所述喇叭10的输入端连接，所述固定滤波器40的输出端与所述通透滤波器30的输入端连接。
具体地，耳机的壳体上设有发声腔，喇叭10和反馈麦克风20均安装于发声腔内，通透滤波器30和固定滤波器40可以集成在主控电路板上并与主控电路板上的处理器电连接，主控电路板安装于壳体内部，主控电路板通过导线与喇叭10和反馈麦克风20电连接。本申请的耳机类型可以为有线耳机或无线耳机，当为有线耳机时，处理器通过耳机线从音源设备上获取音乐信号，当为无线耳机时，处理器通过蓝牙模块从音源设备上获取音乐信号。
本申请的耳机具备通透模式功能，其工作原理是：由位于耳机发声腔内的反馈麦克风20拾取经过壳体衰减后的外界环境声并转化为电信号，并将该电信号通过通透滤波器30进行放大后，与从音源设备接收的音乐信号一同输入喇叭10，由喇叭10播放出音乐和外界环境声，如此，用户便能在听到音乐的同时，清楚地听到外界的环境声。
其中，由于反馈麦克风20与喇叭10共同处于发声腔内，反馈麦克风20除拾取到经过壳体衰减后的外界环境声之外，还会同时拾取到喇叭10播放的声音。喇叭10播放的声音包括两个部分：一个是音乐，另一个则是前一时刻反馈麦克风20拾取的环境声经通透滤波器30放大的声音。这两部分均不应该被反馈麦克风20拾取并处理，否则会造成音乐质量变化且通透模式鲁棒性变差，导致啸叫。
因此，本申请在喇叭10的输入端和通透滤波器30的输入端之间设置固定滤波器40，将输入喇叭10的第一信源信号反相后引至通透滤波器30的输入端，在反馈麦克风20拾取的采集信号中，将上述两种回声的信号抵消，使得进入通透滤波器30的只有当前时刻穿透外壳进入的外部环境声转化的电信号，从而克服音乐质量变化和啸叫问题。
具体地，请参阅图1，以当前时刻为例，反馈麦克风20拾取的采集信号(电信号c)包括三个部分：当前时刻的外界环境声转化的电信号，由喇叭10播放的声音转化的电信号：包括前一时刻的音乐转化的电信号，以及前一时刻由反馈麦克风20拾取的环境声并经通透滤波器30放大的声音转化的电信号。
其中，固定滤波器40的输入端从喇叭10的输入端接收到前一时刻输入喇叭10的第一信源信号(电信号a)，第一信源信号(电信号a)包括前一时刻的音乐信号和前一时刻的通透音频信号，固定滤波器40的输出端输出的为回声抵消信号(电信号b)，回声抵消信号(电信号b)可为第一信源信号(电信号a)的反相信号，即电信号b与电信号a等值反相。第一信源信号(电信号a)与采集信号(电信号c)的关系为：第一信源信号(电信号a)经喇叭 10播出后形成前一时刻音乐和前一时刻通透声，前一时刻音乐和前一时刻通透声连同当前时刻的环境声一起由反馈麦克风20拾取，得到采集信号(电信号c)。同时，第一信源信号(电信号a)输入固定滤波器40，进行反相操作，得到回声抵消信号(电信号b)，然后，采集信号(电信号c)和回声抵消信号(电信号b)叠加后输入通透滤波器30，由于回声抵消信号(电信号b)与第一信源信号(电信号a)等值反相，采集信号(电信号c)和回声抵消信号(电信号b)叠加后，仅剩当前时刻的环境声转化的电信号进入通透滤波器30，由通透滤波器30放大后形成当前时刻的通透音频信号并输入喇叭10，另外，将当前时刻的音乐信号一同输入喇叭10，如此，便能通过喇叭10播放出当前时刻的环境声以及当前时刻的音乐，实现通透模式效果。
进一步地，回声抵消信号可为衰减后的第一信源信号的反相信号，对第一信源信号的反相信号进行衰减操作后作为回声抵消信号，主要考虑到信号输入喇叭10并经喇叭10播放后，再由反馈麦克风20拾取时，信号存在衰减。衰减的程度可通过测试确定，参考该因素确定固定滤波器30的传递函数，可使固定滤波器30输出的回声抵消信号准确抵消反馈麦克风20的采集信号中的回声信号。
因此，本申请的技术方案中，通过反馈麦克风20拾取声音，进行相应的回声处理后，再经通透滤波器30放大外界环境声，从而被人耳捕获。由于反馈麦克风20设置于耳机的发声腔内，不受风噪干扰，故可以在保有较佳通透模式效果的情况下很好的解决大风场景应用中的风噪杂音问题。
进一步地，请参阅图2，所述耳机还包括：自适应滤波器50，所述自适应滤波器50设于所述壳体内，所述自适应滤波器50的输入端与所述固定滤波器40的输出端连接，所述自适应滤波器50的输出端与所述通透滤波器30的输入端连接。
对于每个具体的耳机产品，因量产品制程会导致每个耳机的喇叭10、麦克风或腔体等的响应存在不一致情况，将同一传递函数的固定滤波器40适用于不同的耳机产品时，适配存在差异性，难以满足所有产品的要求。因此，本实施例在固定滤波器40的输出端和通透滤波器30的输入端之间增加自适应滤波器50，可在产线测试环节中，测试每个产品的喇叭10至反馈麦克风20的传递函数并经反相后的测试传递函数，与固定滤波器40已确定的传递函数计算差值，由自适应滤波器50来将该差值拟合。如此，使得每个产品在工作时，可保证将采集信号中的回声信号彻底抵消。
基于上述硬件架构，请参阅图3，本申请提出一种耳机的控制方法的第一实施例，在第一实施例中，所述耳机的控制方法包括以下步骤：
S100、获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号；
S200、根据所述第一信源信号，通过所述固定滤波器生成回声抵消信号；
S300、根据所述采集信号及所述回声抵消信号确定通透音频信号；
S400、根据所述通透音频信号及待播放音乐信号确定第二信源信号，并根据所述第二信源信号控制所述喇叭播放音频。
本申请技术方案中，具体地，耳机的壳体上设有发声腔，喇叭和反馈麦克风均安装于发声腔内，通透滤波器和固定滤波器可以集成在主控电路板上并与主控电路板上的处理器电连接，主控电路板安装于壳体内部，主控电路板通过导线与喇叭和反馈麦克风电连接。本申请的耳机类型可以为有线耳机或无线耳机，当为有线耳机时，处理器通过耳机线从音源设备上获取音乐信号，当为无线耳机时，处理器通过蓝牙模块从音源设备上获取音乐信号。
本申请的耳机具备通透模式功能，其工作原理是：由位于耳机发声腔内的反馈麦克风拾取经过壳体衰减后的外界环境声并转化为电信号，并将该电信号通过通透滤波器进行放大后，与从音源设备接收的音乐信号一同输入喇叭，由喇叭播放出音乐和外界环境声，如此，用户便能在听到音乐的同时，清楚地听到外界的环境声。
其中，由于反馈麦克风与喇叭共同处于发声腔内，反馈麦克风除拾取到经过壳体衰减后的外界环境声之外，还会同时拾取到喇叭播放的声音。喇叭播放的声音包括两个部分：一个是音乐，另一个则是前一时刻反馈麦克风拾取的环境声经通透滤波器放大的声音。这两部分均不应该被反馈麦克风拾取并处理，否则会造成音乐质量变化且通透模式鲁棒性变差，导致啸叫。
因此，本申请在喇叭的输入端和通透滤波器的输入端之间设置固定滤波器，将输入喇叭的第一信源信号反相后引至通透滤波器的输入端，在反馈麦克风拾取的采集信号中，将上述两种多余的信号抵消，使得进入通透滤波器的只有当前时刻穿透外壳进入的外部环境声转化的电信号，从而克服音乐质量变化和啸叫问题。
具体地，请参阅图1，以当前时刻为例，反馈麦克风拾取的采集信号(电信号c)包括 三个部分：当前时刻的外界环境声转化的电信号，由喇叭播放的声音转化的电信号：包括前一时刻的音乐转化的电信号，以及前一时刻由反馈麦克风拾取的环境声并经通透滤波器放大的声音转化的电信号。
其中，固定滤波器的输入端从喇叭的输入端接收到前一时刻输入喇叭的第一信源信号(电信号a)，第一信源信号(电信号a)包括前一时刻的音乐信号和前一时刻的通透音频信号，固定滤波器的输出端输出的为回声抵消信号(电信号b)，回声抵消信号(电信号b)可为第一信源信号(电信号a)的反相信号，即电信号b与电信号a等值反相。第一信源信号(电信号a)与采集信号(电信号c)的关系为：第一信源信号(电信号a)经喇叭播出后形成前一时刻音乐和前一时刻通透声，前一时刻音乐和前一时刻通透声连同当前时刻的环境声一起由反馈麦克风拾取，得到采集信号(电信号c)。同时，第一信源信号(电信号a)输入固定滤波器，进行反相操作，得到回声抵消信号(电信号b)，然后，采集信号(电信号c)和回声抵消信号(电信号b)叠加后输入通透滤波器，由于回声抵消信号(电信号b)与第一信源信号(电信号a)等值反相，采集信号(电信号c)和回声抵消信号(电信号b)叠加后，仅剩当前时刻的环境声转化的电信号进入通透滤波器，由通透滤波器放大后形成当前时刻的通透音频信号并输入喇叭，另外，将待播放的音乐信号(当前时刻的音乐信号)一同输入喇叭，如此，便能通过喇叭播放出当前时刻的环境声以及当前时刻的音乐，实现通透模式效果。
进一步地，回声抵消信号可为衰减后的第一信源信号的反相信号，对第一信源信号的反相信号进行衰减操作后作为回声抵消信号，主要考虑到信号输入喇叭并经喇叭播放后，再由反馈麦克风拾取时，信号存在衰减。衰减的程度可通过测试确定，参考该因素确定固定滤波器的传递函数，可使固定滤波器输出的回声抵消信号准确抵消反馈麦克风的采集信号中的回声信号。
因此，本申请的技术方案中，通过反馈麦克风拾取声音，进行相应的回声处理后，再经通透滤波器放大外界环境声，从而被人耳捕获。由于反馈麦克风设置于耳机的发声腔内，不受风噪干扰，故可以在保有较佳通透模式效果的情况下很好的解决大风场景应用中的风噪杂音问题。
进一步地，请参阅图4，本申请提出一种耳机的控制方法的第二实施例，基于第一实施例，所述步骤S300包括：
S310、将所述采集信号和所述回声抵消信号叠加，得到第一叠加信号；
S320、通过所述通透滤波器对所述第一叠加信号进行放大，得到所述通透音频信号。
本申请实施例中，在固定滤波器将前一时刻输入喇叭的第一信源信号进行固定滤波器处理后形成的回声抵消信号输入通透滤波器之前，与同样输入通透滤波器的由反馈麦克风拾取的采集信号先进行叠加，二者叠加后，能够将采集信号中包含的回声信号抵消，使得只有当前时刻的外界环境声转化的电信号输入通透滤波器，经通透滤波器放大后形成通透音频信号，再输入喇叭，再将当前时刻的音乐信号一同输入喇叭，如此，便能通过喇叭播放出当前时刻的环境声以及当前时刻的音乐，实现通透模式效果。
进一步地，请参阅图5，本申请提出一种耳机的控制方法的第三实施例，基于第一实施例，所述步骤S300包括：
S330、通过所述自适应滤波器对所述回声抵消信号进行补偿，得到修正信号；
S340、将所述采集信号和所述修正信号叠加，得到第二叠加信号；
S350、通过所述通透滤波器对所述第二叠加信号进行放大，得到所述通透音频信号。
对于每个具体的耳机产品，因量产品制程会导致每个耳机的喇叭、麦克风或腔体等的响应存在不一致情况，将同一传递函数的固定滤波器适用于不同的耳机产品时，适配存在差异性，难以满足所有产品的要求。因此，本实施例在固定滤波器的输出端和通透滤波器的输入端之间增加自适应滤波器。可在产线测试环节中，测试每个产品的喇叭至反馈麦克风的传递函数并经反相后的测试传递函数，与固定滤波器已固定的传递函数计算差值，由自适应滤波器来将该差值拟合。
具体地，产品工作时，固定滤波器将前一时刻输入喇叭的第一信源信号经固定滤波器处理后形成的回声抵消信号输入自适应滤波器，经过自适应滤波器对回声抵消信号进行补偿后，可得到校正后的修正信号，该修正信号与反馈麦克风拾取的采集信号进行叠加时，可保证将采集信号中的回声信号彻底抵消，使得只有当前时刻的外界环境声转化的电信号输入通透滤波器。如此，可实现较佳的通透模式效果，并保证较佳的音乐质量。
进一步地，请参阅图6，本申请提出一种耳机的控制方法的第四实施例，基于第三实施例，所述步骤S330包括：
S331、计算所述第一信源信号与所述采集信号之间的相关性；
S332、在所述相关性大于预设阈值时，调整所述自适应滤波器的传递函数；
S333、根据调整后的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
当不同的用户使用同一耳机产品时，因每个用户的生理结构存在差异，导致耳机与用户耳朵的贴合程度也存在不一致情况，那么在使用耳机时，通过产线测试环节所调整的自适应滤波器的传递函数依然无法满足不同用户的使用情况，因此，可在每次使用耳机时，通过相关性计算，对自适应滤波器的传递函数进行动态调整。
具体地，首先对输入喇叭的第一信源信号和反馈麦克风输出的采集信号进行相关性计算，所谓相关性计算，是指在信号的分析中，对两个以上信号的相互关系进行研究。例如在通信系统、雷达系统，或是控制系统中，发送端(如本实施例的喇叭)发出的信号波形是已知的，在接收端(如本实施例的反馈麦克风)信号(或回拨信号)中，判断是否存在由发送端发出的信号，利用它们的相似或相依性作出判断。具体地，相关性的结果介于0和1之间，相关性越小(越接近0)，表示接收端信号中存在的发射端信号越少，反之，相关性越大(越接近1)，表示接收端信号中存在的发射端信号越多。
本实施例中，需要对采集信号中与第一信源信号相关的部分完全剔除，根据相关性计算结果的大小，可相应地调整自适应滤波器的传递函数，从而使自适应滤波器的传递函数能够对固定滤波器的传递函数进行准确补偿，以保证自适应滤波器输出的修正信号与反馈麦克风拾取的采集信号进行叠加后，将采集信号中的回声信号彻底抵消。如此，可实现较佳的通透模式效果，并保证较佳的音乐质量。
进一步地，请参阅图7，本申请提出一种耳机的控制方法的第五实施例，基于第四实施例，所述步骤S331之后，还包括：
S334、在所述相关性小于或等于所述预设阈值时，根据所述自适应滤波器的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
本实施例中，在根据相关性调整自适应滤波器的传递函数时，可设置具体的调整范围，即相关性的预设阈值，比如0.05。将第一信源信号与采集信号之间的相关性计算结果与预设阈值进行比较，当计算的相关性结果大于预设阈值时，说明采集信号中依然存在较多的第一信源信号，此时，需要调整自适应滤波器的传递函数；然后，再次计算第一信源信号与采集信号之间的相关性，并再次判断相关性结果与预设阈值的大小，如果相关性结果大于预设阈值，则仍需继续调整自适应滤波器的传递函数，如此循环反复，直至相关性结果 小于或等于预设阈值时，方才达标。即是说，自适应滤波器会先计算原始信号的第一相关性，然后取一个调整值，计算信号改变后的第二相关性，根据第一相关性和第二相关以及所取的调整值，计算出下一次调整取值应该是多少，通过不断迭代上述操作，能够逐渐靠近最优方案。其中，自适应滤波器调整时的一个指标是每次调整的步长(调整的大小)，步长越大，迭代得越快，迭代次数减少，但是精度较差，故可通过减小每次调整的步长来提高调整精度。其中，相关性计算的具体方法可采用本领域的现有技术，此处不赘述。
本实施例中，通过相关性计算的方法来确定自适应滤波器的传递函数的调整方向的操作，可在耳机工作的同时同步进行，不会干扰用户正常使用耳机，故不会对用户的使用体验造成影响。
另外，需要说明的是，固定滤波器的设置是必要的，自适应滤波器是在固定滤波器的基础上进行微调。尽管可以通过相关性计算进行不断调整而确定出所需的传递函数，但如果只采用自适应滤波器，自适应滤波器的调整幅度较大，所需要的调整时间也较长，调整精度也会受到限制。
进一步地，请参阅图8，本申请提出一种耳机的控制方法的第六实施例，基于上述所有实施例，所述步骤S100之前，还包括：
S101、向所述喇叭馈入第一扫频信号，并获取所述反馈麦克风采集的第一反馈信号；
S102、根据所述第一扫频信号和所述第一反馈信号，确定所述固定滤波器的传递函数。
本实施例中，在产品研发阶段，即可针对同款类型的所有耳机产品确定一个统一的固定滤波器的传递函数。所谓传递函数，是指零初始条件下线性系统响应(即输出)量的拉普拉斯变换(或z变换)与激励(即输入)量的拉普拉斯变换之比。记作G(s)＝Y(s)/U(s)，其中Y(s)、U(s)分别为输出量和输入量的拉普拉斯变换。固定滤波器为喇叭至反馈麦克风的传递函数，并进行反相操作。其中，喇叭至反馈麦克风的传递函数的测试方式是：给喇叭馈入第一扫频信号(扫频信号是指频率在一定范围内周期变化的等幅信号，扫频信号是为了测试而设计的，它主要用来测试元、器件，以及整机的频率特性)，测试反馈麦克风端的输出，计算输出输入的幅度相位差，即得到喇叭至反馈麦克风的传递函数，然后，将该传递函数进行反相操作(即相位反转180°)，即得到固定滤波器的传递函数。
进一步地，请参阅图9，本申请提出一种耳机的控制方法的第七实施例，基于上述所有 实施例，所述步骤S100之前，还包括：
S103、向所述喇叭馈入第二扫频信号，并获取所述反馈麦克风采集的第二反馈信号；
S104、根据所述第二扫频信号和所述第二反馈信号，计算测试传递函数；
S105、根据所述测试传递函数和所述固定滤波器的传递函数之间的差值，确定所述自适应滤波器的传递函数。
本实施例中，在产品测试阶段，可通过对每个耳机产品进行测试，预先设定每个产品的自适应滤波器的传递函数，完成对每个产品校正操作。方法依然是对喇叭至反馈麦克风的传递函数进行测试：给喇叭馈入第二扫频信号，测试反馈麦克风端的输出，计算输出输入的幅度相位差，即得到每个产品的喇叭至反馈麦克风的实际传递函数，将该实际传递函数进行反相操作后，可确定固定滤波器理论状态下所应设定的准确传递函数，该准确传递函数与已固定的固定滤波器的传递函数之间的差值，即确定为自适应滤波器的传递函数。通过自适应滤波器对固定滤波器进行补偿校正，可保证自适应滤波器输出的修正信号与反馈麦克风拾取的采集信号进行叠加后，将采集信号中的回声信号彻底抵消。如此，可实现较佳的通透模式效果，并保证较佳的音乐质量。
为实现上述目的，本申请还提出一种耳机，所述耳机包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如上所述的耳机控制方法的步骤。
为实现上述目的，本申请还提出一种存储介质，所述存储介质上存储有耳机的控制程序，所述耳机的控制程序被处理器执行时实现如上所述的耳机控制方法的步骤。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可 借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在如上所述的一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端空调器(可以是手机，计算机，服务器，空调器，或者网络空调器等)执行本申请各个实施例所述的方法。
以上所述仅为本申请的优选实施例，并非因此限制本申请的专利范围，凡是在本申请的申请构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。

Claims (10)

  1. 一种耳机，其特征在于，所述耳机包括：
    壳体，所述壳体设有发声腔；
    喇叭，所述喇叭设于所述发声腔内；
    反馈麦克风，所述反馈麦克风设于所述发声腔内；
    通透滤波器，所述通透滤波器设于所述壳体内，所述通透滤波器的输入端与所述反馈麦克风的输出端连接，所述通透滤波器的输出端与所述喇叭的输入端连接；
    固定滤波器，所述固定滤波器设于所述壳体内，所述固定滤波器的输入端与所述喇叭的输入端连接，所述固定滤波器的输出端与所述通透滤波器的输入端连接。
  2. 如权利要求1所述的耳机，其特征在于，所述耳机还包括：
    自适应滤波器，所述自适应滤波器设于所述壳体内，所述自适应滤波器的输入端与所述固定滤波器的输出端连接，所述自适应滤波器的输出端与所述通透滤波器的输入端连接。
  3. 一种耳机的控制方法，其特征在于，应用于如权利要求1或2所述耳机，所述耳机的控制方法包括以下步骤：
    获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号；
    根据所述第一信源信号，通过所述固定滤波器生成回声抵消信号；
    根据所述采集信号及所述回声抵消信号确定通透音频信号；
    根据所述通透音频信号及待播放音乐信号确定第二信源信号，并根据所述第二信源信号控制所述喇叭播放音频。
  4. 如权利要求3所述的耳机控制方法，其特征在于，所述回声抵消信号为所述第一信源信号的反相信号；
    或者，所述回声抵消信号为所述第一信源信号经衰减并经反相后形成的信号。
  5. 如权利要求3所述的耳机控制方法，其特征在于，所述根据所述采集信号及所述回声抵消信号确定通透音频信号的步骤包括：
    将所述采集信号和所述回声抵消信号叠加，得到第一叠加信号；
    通过所述通透滤波器对所述第一叠加信号进行放大，得到所述通透音频信号。
  6. 如权利要求3所述的耳机控制方法，其特征在于，所述耳机还包括自适应滤波器，所述根据所述采集信号及所述回声抵消信号确定通透音频信号的步骤包括：
    通过所述自适应滤波器对所述回声抵消信号进行补偿，得到修正信号；
    将所述采集信号和所述修正信号叠加，得到第二叠加信号；
    通过所述通透滤波器对所述第二叠加信号进行放大，得到所述通透音频信号。
  7. 如权利要求6所述的耳机控制方法，其特征在于，所述通过所述自适应滤波器对所述回声抵消信号进行补偿，得到修正信号的步骤包括：
    计算所述第一信源信号与所述采集信号之间的相关性；
    在所述相关性大于预设阈值时，调整所述自适应滤波器的传递函数；
    根据调整后的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
  8. 如权利要求7所述的耳机控制方法，其特征在于，所述计算所述第一信源信号与所述采集信号之间的相关性的步骤之后，还包括：
    在所述相关性小于或等于所述预设阈值时，根据所述自适应滤波器的传递函数对所述回声抵消信号进行补偿，得到所述修正信号。
  9. 如权利要求3所述的耳机控制方法，其特征在于，所述获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号的步骤之前，还包括：
    向所述喇叭馈入第一扫频信号，并获取所述反馈麦克风采集的第一反馈信号；
    根据所述第一扫频信号和所述第一反馈信号，确定所述固定滤波器的传递函数。
  10. 如权利要求6所述的耳机控制方法，其特征在于，所述获取所述反馈麦克风拾取的采集信号，以及所述反馈麦克风的拾音阶段内，所述喇叭的第一信源信号的步骤之前，还包括：
    向所述喇叭馈入第二扫频信号，并获取所述反馈麦克风采集的第二反馈信号；
    根据所述第二扫频信号和所述第二反馈信号，计算测试传递函数；
    根据所述测试传递函数和所述固定滤波器的传递函数之间的差值，确定所述自适应滤波器的传递函数。
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