CN109672970A - A kind of more microphone/ear-headphone echo cancellation filter coefficient calibration methods - Google Patents
A kind of more microphone/ear-headphone echo cancellation filter coefficient calibration methods Download PDFInfo
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- CN109672970A CN109672970A CN201811296359.2A CN201811296359A CN109672970A CN 109672970 A CN109672970 A CN 109672970A CN 201811296359 A CN201811296359 A CN 201811296359A CN 109672970 A CN109672970 A CN 109672970A
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- mike
- echo
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- filter
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
Abstract
It includes: to choose the model machine that microphone/ear-headphone is calculated as echo cancellation filter coefficient more than one that the present invention, which provides a kind of more microphone/ear-headphone echo cancellation filter coefficient calibration methods, to each Mike's access calculating echo cancellation filter coefficient of more microphone/ear-headphones of selection；Using the echo cancellation filter coefficient for each Mike's access being calculated as in reference value write-in storage chip；The coefficient of each Mike's access echo cancellation filter identical with the model machine is arranged in remaining earphone, and the gain of each road Mike of remaining earphone and the gain for playing loudspeaker be subject to each road Mike of the model machine gain and play the gains of loudspeaker and calibrate, and be written in storage chip.The present invention can reduce the computation complexity of echo cancellor, reduce the power consumption of earphone, guarantee the filter wave stability of filter.
Description
Technical field
The present invention relates to bluetooth headset technical field, in particular to a kind of more microphone/ear-headphone echo cancellation filter coefficient schools
Quasi- method.
Background technique
Earphone call noise reduction or intelligent earphone speech recognition propose the anti-acoustic capability of the collected signal of microphone
Relatively high requirement, current many earphone products use two even more microphone denoising schemes, this relates to more
Eliminate the problem of echo in road.
Existing more microphone/ear-headphones generally use multi-subband sef-adapting filter to eliminate echo, especially for earphone ID
After (sequence number, coding of product etc.) determines, the resource for carrying out adaptive elimination echo occupancy to multichannel microphone is more, meter
It calculates with roomy, computation complexity is high, and power consumption is higher, and filter convergence rate is slow, and the stand-by time of intelligent earphone is long.
Therefore, in order to solve the above-mentioned technical problem, a kind of more microphone/ear-headphone echo cancellation filter coefficient calibration sides are needed
Method.
Summary of the invention
The purpose of the present invention is to provide a kind of more microphone/ear-headphone echo cancellation filter coefficient calibration methods, the methods
Include:
The model machine that microphone/ear-headphone is calculated as echo cancellation filter coefficient more than one is chosen, to more microphone/ear-headphones of selection
Each Mike's access calculate echo cancellation filter coefficient；
Using the echo cancellation filter coefficient for each Mike's access being calculated as in reference value write-in storage chip；
The coefficient of each Mike's access echo cancellation filter identical with the model machine, and remaining is arranged in remaining earphone
The gain of each road Mike of earphone and the gain of broadcasting loudspeaker are with the increasing of the gain of each road Mike of the model machine and broadcasting loudspeaker
It is calibrated, and is written in storage chip subject to benefit.
Preferably, more microphone/ear-headphones include left earphone and right earphone, and the left earphone and the rear earphone include
Preposition Mike, postposition Mike and main Mike.
Preferably, more microphone/ear-headphones of selection calculate the method packet of the coefficient of preposition Mike's access echo cancellation filter
It includes:
Calculate the coefficient of preposition Mike's access echo cancellation filter:
The length of preposition Mike's access echo filter is set as M, then n moment preposition Mike's access echo filter is
Number isIt updates and calculates by the following method:
Wherein,
u1(n)=[u1(n),u1(n-1),...,u1(n-M+1)]T,u1It (n) is the echo reference signal of preposition Mike, d1It (n) is the input signal of preposition Mike,
e1It (n) is the signal after preposition Mike's echo cancellor, w1It (n+1) is the preposition updated coefficient of Mike's access echo filter,For the coefficient w of n moment preposition Mike's access echo filter1(n) transposed matrix,For the echo of preposition Mike
Reference signal u1(n) transposed matrix, μ are convergence rate controlling elements.
Preferably, more microphone/ear-headphones of selection calculate the method packet of the coefficient of postposition Mike access echo cancellation filter
It includes:
Calculate the coefficient of postposition Mike access echo cancellation filter:
The length of postposition Mike's access echo filter is set as M, then n moment postposition Mike access echo filter is
Number isIt updates and calculates by the following method:
Wherein,
u2(n)=[u2(n),u2(n-1),...,u2(n-M+1)]T,u2It (n) is postposition Mike echo reference signal, d2It (n) is the input signal of postposition Mike,
e2It (n) is the signal after postposition Mike echo cancellor, w2It (n+1) is the updated coefficient of postposition Mike access echo filter,For the coefficient w of n moment postposition Mike's access echo filter2(n) transposed matrix；For returning for preposition Mike
Acoustic reference signal u2(n) transposed matrix, μ are convergence rate controlling elements.
Preferably, the method that more microphone/ear-headphones of selection calculate the coefficient of main Mike's access echo cancellation filter includes:
Calculate the coefficient of main Mike's access echo cancellation filter:
The length of main Mike's access echo filter is set as M, then the coefficient of n moment main Mike's access echo filter isIt updates and calculates by the following method:
Wherein,
u3(n)=[u3(n),u3(n-1),...,u3(n-M+1)]T,
u3It (n) is main Mike's echo reference signal, d3(n) believe for the input of main Mike
Number, e3It (n) is the signal after main Mike's echo cancellor, w3It (n+1) is the main updated coefficient of Mike's access echo filter,For the coefficient w of n moment main Mike's access echo filter3(n) transposed matrix；Join for the echo of main Mike
Examine signal u3(n) transposed matrix, μ are convergence rate controlling elements.
Preferably, the length M of echo filter is 4ms to 8ms.
A kind of more microphone/ear-headphone echo cancellation filter coefficient calibration methods provided by the invention, for earphone ID (product
Sequence number, coding etc.) determine after the relatively-stationary more microphone/ear-headphones of earphone echo path eliminate echoes, echo can be reduced and disappeared
The computation complexity removed, reduces the power consumption of earphone, and echo cancellation filter of the present invention guarantees filter without considering convergence addressee
Filter wave stability.
It should be appreciated that aforementioned description substantially and subsequent detailed description are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Detailed description of the invention
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage are by the as follows of embodiment through the invention
Description is illustrated, in which:
Fig. 1 diagrammatically illustrates the structural schematic diagram of the more microphone/ear-headphones of the present invention.
Fig. 2 shows the schematic illustrations of echo cancellor of the present invention.
Specific embodiment
By reference to exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to exemplary embodiment as disclosed below；Can by different form come
It is realized.The essence of specification is only to aid in those skilled in the relevant arts' Integrated Understanding detail of the invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings, relevant technical terms should be those skilled in the art
Known to member.In the accompanying drawings, identical appended drawing reference represents same or similar component or same or like step,
Unless otherwise indicated.Below by specific embodiment to a kind of more microphone/ear-headphone echo cancellation filters system provided by the invention
Number calibration methods are illustrated, for clarity explanation provided to the present invention, more wheats to use calibration method of the present invention first
Gram earphone is illustrated.
In embodiment illustratively by taking left earphone and right earphone a pair of earphone as an example, the more Mikes of the present invention as shown in Figure 1
The structural schematic diagram of earphone, more microphone/ear-headphones include left earphone and right earphone in the present embodiment, left earphone and it is described after earphone it is equal
Including preposition Mike, postposition Mike and main Mike.By taking left earphone as an example, left earphone includes preposition Mike 101, postposition Mike 102
With main Mike 103, earphone case 105 is interior to have the broadcasting loudspeaker (loudspeaker) 104 for playing sound, for preposition Mike's 101
Reflection a of the echo from ear canal, signal are stronger；The echo of postposition Mike 102 comes from air borne b, and signal is weaker；Main Mike
103 echo comes from air borne c, and signal is weaker.
After determining for earphone ID (sequence number of product, coding etc.), the path of this three roads echo signal is relatively fixed, and
Echo path is shorter, it is contemplated that and ear casing plays the nonlinear effect of loudspeaker and Mike couple, and echo filter length M takes 4~
8ms can reach preferable echo and inhibit.
The schematic illustration of echo cancellor of the present invention as shown in Figure 2, a kind of more microphone/ear-headphone echoes provided by the invention disappear
Except filter coefficient calibration method comprises the following methods:
The model machine that microphone/ear-headphone is calculated as echo cancellation filter coefficient more than one is chosen, to more microphone/ear-headphones of selection
Each Mike's access calculate echo cancellation filter coefficient.
The model machine that left earphone is calculated as echo cancellation filter coefficient is chosen in the present embodiment, to the preposition wheat of left earphone
Grams 101, postposition Mike 102 and main Mike 103 calculate separately echo cancellation filter coefficient.By preposition Mike 101, postposition Mike
102 and the signal of main Mike 103 be input to and calculate preposition Mike's access echo cancellation filter in echo cancellation filter 106
The coefficient of coefficient, the coefficient of postposition Mike's access echo cancellation filter and main Mike's access echo cancellation filter.
Using the echo cancellation filter coefficient for each Mike's access being calculated as in reference value write-in storage chip.
In the present embodiment, coefficient, the postposition Mike's access for the preposition Mike's access echo cancellation filter being calculated are returned
The coefficient of coefficient and main Mike's access echo cancellation filter that sound eliminates filter is written to storage chip (flash, left earphone
Storage chip) in, as remaining earphone adjustment echo cancellation filter coefficient reference value.
The coefficient of each Mike's access echo cancellation filter identical with the model machine, and remaining is arranged in remaining earphone
The gain of each road Mike of earphone and the gain of broadcasting loudspeaker are with the increasing of the gain of each road Mike of the model machine and broadcasting loudspeaker
It is calibrated, and is written in storage chip subject to benefit.
In the present embodiment, right earphone is not necessarily to carry out the calculating of echo cancellation filter coefficient, directly by model machine (left earphone)
The coefficient for the preposition Mike's access echo cancellation filter being calculated, the coefficient of postposition Mike's access echo cancellation filter and
The coefficient of main Mike's access echo cancellation filter, as the preposition Mike's access echo cancellation filter of oneself coefficient, after
Set the coefficient of Mike's access echo cancellation filter and the coefficient of main Mike's access echo cancellation filter.I.e. right earphone is preposition
The coefficient of Mike's access echo cancellation filter, the coefficient of postposition Mike's access echo cancellation filter and main Mike's access echo
The coefficient for eliminating filter is identical as reference value.
Gain (gain of preposition Mike, the gain of postposition Mike, the main Mike of each road Mike of right earphone earphone simultaneously
Gain) gain (gain of preposition Mike, postposition Mike of each road Mike are compared with model machine (left earphone) with the gain for playing loudspeaker
Gain, main Mike gain) and play loudspeaker gain subject to calibrate.Right earphone is by each road echo cancellation filter
In coefficient, the gain of each road Mike and gain write-in storage chip (flash, the storage chip of right earphone) of broadcasting loudspeaker.
After 106 echo cancellor of echo cancellation filter, noise canceled module 107 is made an uproar for left earphone and right earphone
Sound is eliminated, and the signal after noise is eliminated is divided into two-way, is directly played all the way by broadcasting loudspeaker 104, another way is as echo
Reference signal is input to the calculating that the coefficient of echo cancellation filter is carried out in echo cancellation filter 106.
The coefficient calculating process for the more microphone/ear-headphone echo cancellation filters chosen below to the present invention is illustrated, first
Calculate the coefficient of preposition Mike's access echo cancellation filter:
The length of preposition Mike's access echo filter is set as M, then n moment preposition Mike's access echo filter is
Number isIt updates and calculates by the following method:
Wherein,
u1(n)=[u1(n),u1(n-1),...,u1(n-M+1)]T,u1It (n) is the echo reference signal of preposition Mike, d1It (n) is the input signal of preposition Mike,
e1It (n) is the signal after preposition Mike's echo cancellor, w1It (n+1) is the preposition updated coefficient of Mike's access echo filter,For the coefficient w of n moment preposition Mike's access echo filter1(n) transposed matrix,For the echo of preposition Mike
Reference signal u1(n) transposed matrix, μ are convergence rate controlling elements.
Calculate the coefficient of postposition Mike access echo cancellation filter:
The length of postposition Mike's access echo filter is set as M, then n moment postposition Mike access echo filter is
Number isIt updates and calculates by the following method:
Wherein,
u2(n)=[u2(n),u2(n-1),...,u2(n-M+1)]T,u2It (n) is postposition Mike echo reference signal, d2It (n) is the input signal of postposition Mike,
e2It (n) is the signal after postposition Mike echo cancellor, w2It (n+1) is the updated coefficient of postposition Mike access echo filter,For the coefficient w of n moment postposition Mike's access echo filter2(n) transposed matrix；For returning for preposition Mike
Acoustic reference signal u2(n) transposed matrix, μ are convergence rate controlling elements.
Calculate the coefficient of main Mike's access echo cancellation filter:
The length of main Mike's access echo filter is set as M, then the coefficient of n moment main Mike's access echo filter isIt updates and calculates by the following method:
Wherein,
u3(n)=[u3(n),u3(n-1),...,u3(n-M+1)]T,
u3It (n) is main Mike's echo reference signal, d3(n) believe for the input of main Mike
Number, e3It (n) is the signal after main Mike's echo cancellor, w3It (n+1) is the main updated coefficient of Mike's access echo filter,For the coefficient w of n moment main Mike's access echo filter3(n) transposed matrix；Join for the echo of main Mike
Examine signal u3(n) transposed matrix, μ are convergence rate controlling elements.
In embodiment in the above process, the path of echo signal is relatively fixed, and echo path is shorter, it is contemplated that earphone
Shell, plays the nonlinear effect of loudspeaker and Mike couple, and echo filter length M takes 4~8ms.
The coefficient of each road echo cancellation filter is stored in respective storage chip by left earphone and right earphone, in earphone
In use, the coefficient for directly loading each road echo cancellation filter from storage chip carries out echo cancellor.
A kind of more microphone/ear-headphone echo cancellation filter coefficient calibration methods provided by the invention, for earphone ID (product
Sequence number, coding etc.) determine after the relatively-stationary more microphone/ear-headphones of earphone echo path eliminate echoes, echo can be reduced and disappeared
The computation complexity removed, reduces the power consumption of earphone, and echo cancellation filter of the present invention guarantees filter without considering convergence addressee
Filter wave stability.
In conjunction with the explanation and practice of the invention disclosed here, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (6)
1. a kind of more microphone/ear-headphone echo cancellation filter coefficient calibration methods, which is characterized in that the described method includes:
Microphone/ear-headphone is calculated as echo cancellation filter coefficient more than one model machine is chosen, to the every of more microphone/ear-headphones of selection
One Mike's access calculates echo cancellation filter coefficient；
Using the echo cancellation filter coefficient for each Mike's access being calculated as in reference value write-in storage chip；
The coefficient of each Mike's access echo cancellation filter identical with the model machine, and remaining earphone is arranged in remaining earphone
Each road Mike gain and play loudspeaker gain with the gain of each road Mike of the model machine and play loudspeaker gain be
Standard is calibrated, and is written in storage chip.
2. calibration method according to claim 1, which is characterized in that more microphone/ear-headphones include left earphone and auris dextra
Machine, the left earphone and the right earphone include preposition Mike, postposition Mike and main Mike.
3. calibration method according to claim 1, which is characterized in that more microphone/ear-headphones of selection calculate preposition Mike's access
The method of the coefficient of echo cancellation filter includes:
Calculate the coefficient of preposition Mike's access echo cancellation filter:
The length of preposition Mike's access echo filter is set as M, then the coefficient of n moment preposition Mike's access echo filter isIt updates and calculates by the following method:
Wherein,u1(n)=
[u1(n),u1(n-1),...,u1(n-M+1)]T,u1(n) it is referred to for the echo of preposition Mike
Signal, d1It (n) is the input signal of preposition Mike, e1It (n) is the signal after preposition Mike's echo cancellor, w1It (n+1) is preposition wheat
Gram updated coefficient of access echo filter,For the coefficient w of n moment preposition Mike's access echo filter1(n)
Transposed matrix,For the echo reference signal u of preposition Mike1(n) transposed matrix, μ are convergence rate controlling elements.
4. calibration method according to claim 1, which is characterized in that more microphone/ear-headphones of selection calculate postposition Mike access
The method of the coefficient of echo cancellation filter includes:
Calculate the coefficient of postposition Mike access echo cancellation filter:
The length of postposition Mike's access echo filter is set as M, then the coefficient of n moment postposition Mike access echo filter isIt updates and calculates by the following method:
Wherein,u2(n)=
[u2(n),u2(n-1),...,u2(n-M+1)]T,u2It (n) is postposition Mike echo with reference to letter
Number, d2It (n) is the input signal of postposition Mike, e2It (n) is the signal after postposition Mike echo cancellor, w2It (n+1) is postposition Mike
The updated coefficient of access echo filter,For the coefficient w of n moment postposition Mike's access echo filter2(n) turn
Set matrix；For the echo reference signal u of preposition Mike2(n) transposed matrix, μ are convergence rate controlling elements.
5. calibration method according to claim 1, which is characterized in that more microphone/ear-headphones of selection calculate main Mike's access and return
The method of coefficient that sound eliminates filter includes:
Calculate the coefficient of main Mike's access echo cancellation filter:
The length of main Mike's access echo filter is set as M, then the coefficient of n moment main Mike's access echo filter isIt updates and calculates by the following method:
Wherein,u3(n)=
[u3(n),u3(n-1),...,u3(n-M+1)]T,u3It (n) is main Mike's echo with reference to letter
Number, d3It (n) is the input signal of main Mike, e3It (n) is the signal after main Mike's echo cancellor, w3(n+1) it is returned for main Mike's access
The updated coefficient of acoustic filter,For the coefficient w of n moment main Mike's access echo filter3(n) transposed matrix；For the echo reference signal u of main Mike3(n) transposed matrix, μ are convergence rate controlling elements.
6. according to method described in claim 3 or 4 or 5, which is characterized in that the length M of echo filter is 4ms to 8ms.
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| CN106412788A (en) * | 2016-10-31 | 2017-02-15 | 歌尔科技有限公司 | Method and system for testing feed-forward active noise reduction earphones |
| CN107134281A (en) * | 2017-05-04 | 2017-09-05 | 重庆第二师范学院 | Adaptive filter coefficient update method during a kind of adaptive echo is eliminated |
| CN108377436A (en) * | 2018-01-24 | 2018-08-07 | 歌尔科技有限公司 | A kind of method, apparatus and active noise reduction earphone adjusting active noise reduction earphone gain |
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2018
- 2018-11-01 CN CN201811296359.2A patent/CN109672970B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6457898A (en) * | 1987-08-27 | 1989-03-06 | Hudson Soft Co Ltd | Sound volume adjusting device for sound generator |
| US20130163772A1 (en) * | 2010-09-08 | 2013-06-27 | Eiko Kobayashi | Sound masking device and sound masking method |
| CN106412788A (en) * | 2016-10-31 | 2017-02-15 | 歌尔科技有限公司 | Method and system for testing feed-forward active noise reduction earphones |
| CN107134281A (en) * | 2017-05-04 | 2017-09-05 | 重庆第二师范学院 | Adaptive filter coefficient update method during a kind of adaptive echo is eliminated |
| CN108377436A (en) * | 2018-01-24 | 2018-08-07 | 歌尔科技有限公司 | A kind of method, apparatus and active noise reduction earphone adjusting active noise reduction earphone gain |
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