CN108174320B - A kind of adaptive ear canal active noise reduction earphone and adaptive ear canal active denoising method - Google Patents
A kind of adaptive ear canal active noise reduction earphone and adaptive ear canal active denoising method Download PDFInfo
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- CN108174320B CN108174320B CN201810084308.7A CN201810084308A CN108174320B CN 108174320 B CN108174320 B CN 108174320B CN 201810084308 A CN201810084308 A CN 201810084308A CN 108174320 B CN108174320 B CN 108174320B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Headphones And Earphones (AREA)
Abstract
The present invention discloses a kind of adaptive ear canal active noise reduction earphone and adaptive ear canal active denoising method, earphone includes loudspeaker, Audio Input Modules, microphone, computing module and noise reduction process module, the Audio Input Modules, computing module, microphone and loudspeaker are connect with noise reduction process module, and the microphone is placed in the ante-chamber of loudspeaker.Noise-reduction method, comprising the following steps: 1) artitificial ear obtains third frequency response curve and third phase curve to calibration audio collection；2) microphone simultaneously acquires calibration audio and peripheral sound, obtains the first frequency response curve, first phase curve and second phase curve；3) computing module obtains filter coefficient according to the data obtained by step 1) and step 2 and fixed algorithm operation；4) noise reduction process module carries out noise reduction process to audio using filter coefficient.The present invention adapts to the noise reduction requirement of various different ear canals, meets the noise reduction demand of user, gives the good experience sense of user.
Description
Technical field
The present invention relates to noise reduction technology field, in particular to a kind of adaptive ear canal active noise reduction earphone and adaptive ear canal
Active denoising method.
Background technique
Earphone has been obtained extensive use in the ordinary life and work of people, earphone in addition to being used to appreciate music,
Except the function of amusement, it is also widely used in isolation noise, keeps relatively quiet environment, but earphone is to low-frequency noise
Noise isolating effect and ability be limited.
The method that active noise reduction techniques use is to generate a signal opposite with outside noise amplitude same phase to support
Disappear into the noise of earphone.But the active noise reduction techniques used in earphone at present all only have constant noise reduction curve, due to every
Personal ear canal space is all unique, so everyone sensory difference of noise reduction effect is very big, it is meant that for certain people
The noise cancelling headphone felt good, it is very poor or at all without noise reduction effect in other people noise reduction effects.How for everyone
The strongest noise cancelling headphone of ear canal design flexibility is always the first problem of noise cancelling headphone design.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiency of the prior art, provide a kind of adaptive ear canal
Active noise reduction earphone and adaptive ear canal active denoising method adapt to the noise reduction requirement of various different ear canals, meet user
Noise reduction demand, give the good experience sense of user.
In order to solve the above technical problems, the technical scheme is that
A kind of active noise reduction earphone of adaptive ear canal, comprising:
Loudspeaker, for playing calibration audio and the audio after noise reduction process；
Audio Input Modules, for calibration audio and audio to be interacted, inputted with Intelligent terminal data；
Microphone is acquired calibration audio and is converted into the first audio signal, is acquired and turns to peripheral sound
Change the second audio signal into, the microphone is placed in the ante-chamber of loudspeaker；
Computing module, is converted into the first parameter for the first audio signal, and the second audio signal is converted into the second parameter, is matched
It closes to be stored in its internal third parameter and fix algorithm operation and obtains noise reduction parameters；And
Noise reduction process module carries out noise reduction process to audio according to the noise reduction parameters that computing module is calculated；
The Audio Input Modules, computing module, microphone and loudspeaker are connect with noise reduction process module, the Mike
Wind is placed in the ante-chamber of loudspeaker.
As a preferred embodiment, the noise reduction process module includes filter, and the noise reduction parameters are filter coefficient.
As a preferred embodiment, first parameter be microphone to calibration audio be acquired and obtain first frequency
Ring curve and first phase curve.
As a preferred embodiment, second parameter is the second phase that microphone is acquired to peripheral sound and obtains
Position curve.
As a preferred embodiment, the third parameter be artitificial ear to calibration audio be acquired and obtain third frequency
Ring curve and third phase curve.
As a preferred embodiment, the fixed algorithm includes that the first calculation formula, the second calculation formula and third calculate
Formula,
First calculation formula includes frequency response error curve calculation formula and phase error curve calculation formula；
The frequency response error curve calculation formula are as follows: EAn=An-An*, wherein EAn is frequency response error curve, and An is third
Frequency response curve, An* are the first frequency response curve；
The phase error curve calculation formula are as follows: EBn=Bn-Bn*, wherein EBn is phase error curve, and Bn is third
Phase curve, Bn* are first phase curve；
Second calculation formula are as follows: P=EAn * SIN (θ-EBn), wherein P is the first frequency response curve and first phase
The compensated curve of curve, θ are second phase curve；
The third calculation formula are as follows: F=- (C+P), wherein F is filter coefficient, and C is the first frequency response curve and first
Phase curve.
As a preferred embodiment, the microphone is reaction type microphone.
A kind of active denoising method of adaptive ear canal is based on artitificial ear and active noise reduction earphone as described above, described
Active denoising method the following steps are included:
1) calibration audio is sent to loudspeaker and played back by Audio Input Modules, and artitificial ear adopts calibration audio
Collection, obtains third frequency response curve and third phase curve, and third frequency response curve and third phase curve are stored in operation mould
In block；
2) it is placed in microphone in the cavity that loudspeaker ante-chamber and human antrum auris are collectively formed, Audio Input Modules will be calibrated
Audio is sent to loudspeaker and plays back, and microphone is simultaneously acquired calibration audio and peripheral sound and is converted into the first sound
Frequency signal and the second audio signal, computing module by the first audio signal and the second audio signal be converted into the first frequency response curve,
First phase curve and second phase curve；
3) computing module is obtained by the third frequency response curve and third phase curve that are obtained by step 1), by step 2
First frequency response curve, first phase curve and second phase curve and the fixation algorithm being built in computing module cooperate operation
It obtains filter coefficient, and filter coefficient is sent to the filter of noise reduction process module；
4) audio is sent to noise reduction process module by Audio Input Modules, and the filter use of noise reduction process module is by step
3) filter coefficient obtained is filtered noise reduction process to audio, is then sent to the audio after filtering noise reduction process and raises
Sound device plays back.
As a preferred embodiment, the filter coefficient in step 3) measuring method the following steps are included:
1) computing module passes through third frequency response curve, third phase curve, the first frequency response curve, first phase curve and the
The cooperation operation of one calculation formula obtains frequency response error curve and phase error curve；
2) computing module passes through second phase curve, the second calculation formula and the frequency response error curve obtained by step 1)
The compensated curve of the first frequency response curve and first phase curve is obtained with phase error curve fitting operation；
3) computing module is by being obtained by the first frequency response curve, first phase curve, third computing module and by step 3)
To the first frequency response curve and first phase curve compensated curve cooperation operation obtain filter coefficient.
As a preferred embodiment, the frequency range of the calibration audio are as follows: 50-500HZ.
The beneficial effects of the present invention are: passing through loudspeaker, microphone, Audio Input Modules, noise reduction process module and operation
The cooperation of module is realized that the noise reduction parameters being calculated according to computing module carry out noise reduction process noise reduction process to audio, can be fitted
The noise reduction requirement for answering various different ear canals, reaches best noise reduction effect, meets the noise reduction demand of user, brings for user better
Experience.
Detailed description of the invention
Fig. 1 is the assembling assumption diagram of embodiments of the present invention；
Fig. 2 is the active noise reduction process frame diagram of the present invention；
Fig. 3 is the measuring and calculating process frame diagram of the filter coefficient of the present invention.
In figure: 1- loudspeaker, 2- Audio Input Modules, 3- microphone, 4- computing module, 5- noise reduction process module.
Specific embodiment
Xia Mianjiehefutuduibenfamingjiegouyuanlihegongzuoyuanlizuojinyibuxiangxishuoming.
As shown in Figure 1, a kind of active noise reduction earphone of adaptive ear canal, comprising:
Loudspeaker 1, for playing calibration audio and the audio after noise reduction process；
Audio Input Modules 2, for calibration audio and audio to be interacted, inputted with Intelligent terminal data；
Microphone 3 is acquired calibration audio and is converted into the first audio signal, is acquired and turns to peripheral sound
Change the second audio signal into, the microphone 3 is placed in the ante-chamber of loudspeaker 1；
Computing module 4, is converted into the first parameter for the first audio signal, and the second audio signal is converted into the second parameter,
Cooperation is stored in its internal third parameter and fixed algorithm operation obtains noise reduction parameters；And
Noise reduction process module 5 carries out noise reduction process to audio according to the noise reduction parameters that computing module 4 is calculated；
The Audio Input Modules 2, computing module 4, microphone 3 and loudspeaker 1 are connect with noise reduction process module 5, institute
State the ante-chamber that microphone 3 is placed in loudspeaker 1.The noise reduction process module 5 includes filter, and the noise reduction parameters are filter
Coefficient.First parameter is that the first frequency response curve and first phase that 3 pairs of microphone calibration audios are acquired and obtain are bent
Line.Second parameter is the second phase curve that microphone 3 is acquired peripheral sound and obtains.The third parameter is
Artitificial ear is acquired to calibration audio and the third frequency response curve and third phase curve that obtain.The microphone 3 is feedback
Formula microphone.
The fixed algorithm includes the first calculation formula, the second calculation formula and third calculation formula,
First calculation formula includes frequency response error curve calculation formula and phase error curve calculation formula；
The frequency response error curve calculation formula are as follows: EAn=An-An*, wherein EAn is frequency response error curve, and An is third
Frequency response curve, An* are the first frequency response curve；
The phase error curve calculation formula are as follows: EBn=Bn-Bn*, wherein EBn is phase error curve, and Bn is third
Phase curve, Bn* are first phase curve；
Second calculation formula are as follows: P=EAn * SIN (θ-EBn), wherein P is the first frequency response curve and first phase
The compensated curve of curve, θ are second phase curve；
The third calculation formula are as follows: F=- (C+P), wherein F is filter coefficient, and C is the first frequency response curve and first
Phase curve.
As shown in Fig. 2, a kind of active denoising method of adaptive ear canal, is based on artitificial ear and active noise reduction as described above
Earphone, the active denoising method the following steps are included:
1) calibration audio is sent to loudspeaker 1 and played back by Audio Input Modules 2, and artitificial ear adopts calibration audio
Collection, obtains third frequency response curve and third phase curve, and third frequency response curve and third phase curve are stored in operation mould
In block 4；Since noise cancelling headphone noise reduction effect performance difference is concentrated mainly on low frequency, the frequency range of audio is calibrated are as follows:
50-500HZ；
2) it is placed in microphone 3 in the cavity that 1 ante-chamber of loudspeaker and human antrum auris are collectively formed, Audio Input Modules 2 will
Calibration audio is sent to loudspeaker 1 and plays back, and microphone 3 is simultaneously acquired calibration audio and peripheral sound and is converted into
First audio signal and the second audio signal are converted into the first frequency by the first audio signal and the second audio signal, computing module 4
Ring curve, first phase curve and second phase curve；
3) computing module 4 is obtained by the third frequency response curve and third phase curve that are obtained by step 1), by step 2
The first frequency response curve, first phase curve and second phase curve and be built in computing module 4 fixation algorithm cooperation
Operation obtains filter coefficient, and filter coefficient is sent to the filter of noise reduction process module 5；
4) audio is sent to noise reduction process module 5 by Audio Input Modules 2, the filter use of noise reduction process module 5 by
The filter coefficient that step 3) obtains is filtered noise reduction process to audio, then sends the audio after filtering noise reduction process
It is played back to loudspeaker 1.
As shown in figure 3, the measuring method of the filter coefficient in step 3) the following steps are included:
1) computing module 4 by third frequency response curve, third phase curve, the first frequency response curve, first phase curve and
The cooperation operation of first calculation formula obtains frequency response error curve and phase error curve；
2) computing module 4 passes through second phase curve, the second calculation formula and the frequency response error song obtained by step 1)
Line and phase error curve fitting operation obtain the compensated curve of the first frequency response curve and first phase curve；
3) computing module 4 is by being obtained by the first frequency response curve, first phase curve, third computing module and by step 3)
To the first frequency response curve and first phase curve compensated curve cooperation operation obtain filter coefficient.
The above is only better embodiment of the present invention, and all technical solutions according to the present invention are to above implementation
Any subtle modifications, equivalent variations and modifications, belong in the range of technical solution of the present invention made by mode.
Claims (7)
1. a kind of active noise reduction earphone of adaptive ear canal, it is characterised in that: include:
Loudspeaker, for playing calibration audio and the audio after noise reduction process；
Audio Input Modules, for calibration audio and audio to be interacted, inputted with Intelligent terminal data；
Microphone is acquired calibration audio and is converted into the first audio signal, is acquired and is converted into peripheral sound
Second audio signal, the microphone are placed in the ante-chamber of loudspeaker；
First audio signal is converted into the first parameter by computing module, and the second audio signal is converted into the second parameter, cooperation storage
It is stored in its internal third parameter and fixed algorithm operation obtains noise reduction parameters；And
Noise reduction process module carries out noise reduction process to audio according to the noise reduction parameters that computing module is calculated；
The Audio Input Modules, computing module, microphone and loudspeaker are connect with noise reduction process module, and the microphone is put
It is placed in the ante-chamber of loudspeaker；
First parameter be microphone calibration audio is acquired and the first frequency response curve and first phase curve that obtain；
Second parameter is the second phase curve that microphone is acquired to peripheral sound and obtains；The third parameter is artificial
Ear is acquired to calibration audio and the third frequency response curve and third phase curve that obtain.
2. a kind of active noise reduction earphone of adaptive ear canal according to claim 1, it is characterised in that: the noise reduction process
Module includes filter, and the noise reduction parameters are filter coefficient.
3. a kind of active noise reduction earphone of adaptive ear canal according to claim 2, it is characterised in that: the fixed algorithm
Including the first calculation formula, the second calculation formula and third calculation formula,
First calculation formula includes frequency response error curve calculation formula and phase error curve calculation formula；
The frequency response error curve calculation formula are as follows: EAn=An-An*, wherein EAn is frequency response error curve, and An is third frequency response
Curve, An* are the first frequency response curve；
The phase error curve calculation formula are as follows: EBn=Bn-Bn*, wherein EBn is phase error curve, and Bn is third phase
Curve, Bn* are first phase curve；
Second calculation formula are as follows: P=EAn * SIN (θ-EBn), wherein P is the first frequency response curve and first phase curve
Compensated curve, θ be second phase curve；
The third calculation formula are as follows: F=- (C+P), wherein F is filter coefficient, and C is the first frequency response curve and first phase
Curve.
4. a kind of active noise reduction earphone of adaptive ear canal according to claim 1, it is characterised in that: the microphone is
Reaction type microphone.
5. a kind of active denoising method of adaptive ear canal, it is characterised in that: based on artitificial ear and as described in claim 1-4
Active noise reduction earphone, the active denoising method the following steps are included:
1) calibration audio is sent to loudspeaker and played back by Audio Input Modules, and artitificial ear is acquired calibration audio, obtains
It is stored in computing module to third frequency response curve and third phase curve, and by third frequency response curve and third phase curve；
2) it is placed in microphone in the cavity that loudspeaker ante-chamber and human antrum auris are collectively formed, Audio Input Modules will calibrate audio
It is sent to loudspeaker to play back, microphone is simultaneously acquired calibration audio and peripheral sound and is converted into the first audio letter
Number and the second audio signal, computing module the first audio signal and the second audio signal are converted into the first frequency response curve, first
Phase curve and second phase curve；
3) computing module by the third frequency response curve and third phase curve that are obtained by step 1), obtained by step 2 first
Frequency response curve, first curve and second phase curve and the fixation algorithm being built in computing module cooperation operation obtain filter
Wave device coefficient, and filter coefficient is sent to the filter of noise reduction process module；
4) audio is sent to noise reduction process module by Audio Input Modules, and the filter use of noise reduction process module is obtained by step 3)
To filter coefficient noise reduction process is filtered to audio, the audio after filtering noise reduction process is then sent to loudspeaker
It plays back.
6. a kind of active denoising method of adaptive ear canal according to claim 5, it is characterised in that: the filter in step 3)
The measuring method of wave device coefficient the following steps are included:
1) computing module passes through third frequency response curve, third phase curve, the first frequency response curve, first phase curve and the first meter
It calculates formula cooperation operation and obtains frequency response error curve and phase error curve；
2) computing module passes through second phase curve, the second calculation formula and the frequency response error curve obtained by step 1) and phase
Position error curve cooperation operation obtains the compensated curve of the first frequency response curve and first phase curve；
3) computing module is by being obtained by the first frequency response curve, first phase curve, third computing module and by step 3)
The cooperation operation of the compensated curve of first frequency response curve and first phase curve obtains filter coefficient.
7. a kind of active denoising method of adaptive ear canal according to claim 5, it is characterised in that: the calibration audio
Frequency range are as follows: 50-500HZ.
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Families Citing this family (11)
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| CN109246517B (en) * | 2018-10-12 | 2021-03-12 | 歌尔科技有限公司 | Noise reduction microphone correction method of wireless earphone, wireless earphone and charging box |
| CN110740413B (en) * | 2019-09-12 | 2022-01-28 | 广东思派康电子科技有限公司 | Environmental sound monitoring parameter calibration system and method |
| US10834494B1 (en) | 2019-12-13 | 2020-11-10 | Bestechnic (Shanghai) Co., Ltd. | Active noise control headphones |
| CN110996210B (en) * | 2019-12-13 | 2021-11-23 | 恒玄科技(上海)股份有限公司 | Method for sound field equalization and earphone |
| CN110896512B (en) * | 2019-12-13 | 2022-06-10 | 恒玄科技(上海)股份有限公司 | Noise reduction method and system for semi-in-ear earphone and semi-in-ear earphone |
| CN111010657B (en) * | 2019-12-19 | 2022-01-25 | 深圳市方宁思创科技有限公司 | Digital ANC automatic simulation test method |
| CN111541971B (en) * | 2020-01-08 | 2022-07-05 | 恒玄科技(北京)有限公司 | Method for actively reducing noise of earphone, active noise reduction system and earphone |
| CN111212351A (en) * | 2020-02-28 | 2020-05-29 | 邝建红 | Self-calibration self-adaptive device and system for active noise reduction earphone |
| CN111491234B (en) * | 2020-04-16 | 2022-01-28 | 广东思派康电子科技有限公司 | Headset noise reduction earphone |
| CN112738692B (en) * | 2021-02-03 | 2022-05-24 | 广州由我科技股份有限公司 | Filter design method, device, earphone, electronic equipment and storage medium |
| CN113794965B (en) * | 2021-10-28 | 2022-11-01 | 歌尔科技有限公司 | Earphone frequency response calibration method and device, earphone equipment and storage medium |
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