CN1819608A - Multi-path echo eliminating system based on SIMO channel blind discrimination - Google Patents
Multi-path echo eliminating system based on SIMO channel blind discrimination Download PDFInfo
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Abstract
The invention consists of echo eliminator, microphone and speaker. The near end microphone is connected to the far end speaker. In each pair of microphone and speaker there is an echo eliminator. The echo eliminator comprises SIMO blind identification module, sound source estimation module, talkback detecting module, echo channel estimating module, convolution module, and adder. The SIMO blind identification module, sound source estimating module, convolution module and adder are connected. The output of sound source module is connected to the SIMO blind identification module through talkback module and is connected to convolution module through echo channel estimating module. The SIMO blind identification module and the sound source module are simultaneously connected to m far end microphones and near end speakers through m parallel input ends IX. The adder, echo channel estimating module and talkback module is connected to a near end microphone through an input end IY.
Description
Technical field
The present invention relates to seal the ECT echo cancellation technique in the voice environment, specifically be meant multi-path echo eliminating system based on SIMO (the many outputs of the single input of SingleInput Multi Output) channel blind discrimination.
Background technology
Along with the development of the develop rapidly of electronic communication, particularly multimedia communication, hands-free communication device has obtained extensive use in mobile communication in the systems such as vehicle-carrying communication and teleconference.But these systems often are difficult to avoid the puzzlement of echo, and are very serious such as echo problems in the sealing voice environment that is made of loudspeaker, room and microphone.In order to improve the Speech Communication quality, echo eliminator is used to eliminate the coupling between loudspeaker and the microphone, disturbs to reduce echo, makes every effort to set up in actual applications effective hands-free communication systems.On the other hand, for Space that strengthens sound and the comfortableness that improves conversation, multi-path voice communication is necessary.Yet for multi-path voice communication, there are many acoustic path to need identification, need carry out multi-path echo and eliminate.It all is to eliminate at the single channel echo that existing echo is eliminated patented technology many.Compare with the elimination of single channel echo, multi-path echo is eliminated some new problems that face.Owing to need pick out many acoustics channels uniquely, multi-path echo is eliminated more difficult more than single channel problem, and traditional multi-path echo arrester can't be estimated the impulse response of near-end room uniquely.In addition, because the strong correlation between a plurality of input signals, the imbalance of traditional multi-path echo arrester is very big, can not satisfy application requirements well.Owing to these two reasons, the performance of traditional multi-path echo arrester is subjected to very big restriction.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, provide that a kind of imbalance is little, echo disturb few, the measured multi-path echo eliminating system of Speech Communication matter based on the SIMO channel blind discrimination.
The present invention also aims to provide the multi-path echo removing method of above-mentioned multi-path echo eliminating system based on the SIMO channel blind discrimination.
Purpose of the present invention is achieved through the following technical solutions: this multi-path echo eliminating system based on the SIMO channel blind discrimination comprises echo eliminator, microphone, loudspeaker, each near-end microphone connects far-end loudspeaker, otherwise, each far-end microphone also connects near-end loudspeaker, each is to microphone, connect an echo eliminator between the loudspeaker, described echo eliminator comprises SIMO blind discrimination module, the sound estimation module, the intercommunication detection module, the echo channel estimation module, convolution module, adder, described SIMO blind discrimination module, the sound source estimation module, convolution module, adder connects, the output of described sound source estimation module also is connected with SIMO blind discrimination module by the intercommunication detection module, and be connected with convolution module by the echo channel estimation module, described SIMO blind discrimination module, the sound source estimation module is passed through m parallel input IX and m far-end microphone of echo eliminator simultaneously, the near-end loudspeaker connect, described adder, the echo channel estimation module, the intercommunication detection module is connected with a near-end microphone by an input IY of echo eliminator, and the output of adder is connected with corresponding far-end loudspeaker by an output OUT of echo eliminator.
For realizing the present invention better, described SIMO blind discrimination module comprises m initial construction matrix module, m follow-up structural matrix module, total structural matrix module, the update calculation module, g parameter cache module, described the 1st initial construction matrix module is connected with the 1st follow-up structural matrix module, m initial construction matrix module is connected respectively with the 1st～m follow-up structural matrix module, described m follow-up structural matrix module is connected with total structural matrix module, total structural matrix module, the update calculation module, g parameter cache module connects successively, the update calculation module with described intercommunication detection module is connected.
Described g parameter cache module comprises m memory.
This is based on the multi-path echo removing method of the multi-path echo eliminating system of SIMO channel blind discrimination, it comprises parameter update and echo elimination, described parameter update and echo are eliminated parallel carrying out, described parameter update is meant under the situation that does not have both sides' intercommunication, estimating or upgrading the contrary of far-end room impulse response is the g parameter, and echo path impulse response is a self adaptation echo channel characteristic estimating in the echo channel estimation module
If there is intercommunication in both sides, echo is eliminated and is proceeded, but parameter is not upgraded; Described echo is eliminated and is meant that at the contrary of known far-end room impulse response be on the basis of g parameter, estimates far-end room source signal
Estimation in conjunction with echo path impulse response
And then obtain the estimation of echo-signal
The received signal y of near-end room microphone (t) deducts the estimation of echo-signal
The echo that is eliminated clean signal afterwards, thus reach the purpose that echo is eliminated.
The step that described echo is eliminated comprises:
(1) the g parameter cache module in the SIMO blind discrimination module is carried out initialization, and to self adaptation echo channel characteristic estimating in the echo channel estimation module
Carry out initialization;
(2) by g parameter cache module the g parameter is sent into the sound source estimation module, simultaneously far-end room microphone signal x
1(t) ..., x
m(t) also be transfused to the sound source estimation module, the sound source estimation module is handled the estimated value that draws far-end room sound-source signal
And will
Send intercommunication detection module and echo channel estimation module to;
(3) the echo channel estimation module receives
After, will
With
Convolution obtains the estimation of echo
(4) estimation of echo
Be sent to adder after the negate, the signal y (t) that the near-end room microphone of input summer receives deducts echo and estimates
Obtain
For going echo clean signal afterwards, realize the echo elimination;
(5) return step (2), proceed echo and eliminate.
The step of described parameter update comprises:
(1) detection cycle time of intercommunication detection module judges whether to exist the intercommunication signal, and will detect judged result and be input to SIMO blind discrimination module and echo channel estimation module, whether decision carries out parameter update, if there is both sides' intercommunication, need not carry out parameter update, if there is not both sides' intercommunication, then carry out step (2) and step (3).
(2) SIMO blind discrimination module is to the x of input
1(t) ..., x
m(t) and y (t) handle, result sends the update calculation module to, to upgrade the g parameter in the g parameter cache module;
(3) obtain new echo channel estimated parameter promptly by adaptive algorithm
And to the former preservation of echo channel estimation module
Upgrade.
Be 0.3～2 second described cycle time.
The step that described intercommunication is judged is:
(1) by down trigger cycle time, the intercommunication detection module calculates
And the coefficient correlation between the y (t)
(2) judge coefficient correlation ζ and threshold values c
1Magnitude relationship, c wherein
1Be positive number, get c
1=0.1～0.5, if
Think and do not have both sides' intercommunication; Otherwise think and have both sides' intercommunication.
Principle of the present invention is: SIMO channel blind discrimination module application is eliminated in multi-path echo, mainly comprised three processes: the contrary and echo path impulse response of far-end room impulse response is estimated or upgraded in (1) under the situation that does not have both sides' intercommunication; (2) on the contrary basis of known far-end room impulse response, estimate far-end room source signal, in conjunction with the estimation of echo path impulse response, and then obtain the estimation of echo-signal; (3) received signal of near-end room microphone deducts echo-signal and realizes the echo elimination.
Basically, do not having under both sides' intercommunication situation, a plurality of input signals of near-end room all are to be got by the same sound source filtering in far-end room, and this has just constituted a SIMO system, thereby can be by SIMO blind discrimination module implementation procedure (1); The impulse response of estimation from far-end room source signal to the near-end room echo can be solved by the single channel method for echo cancellation, adopts auto-adaptive filtering technique to reach this purpose usually.
That the present invention lacks of proper care is little, echo disturbs fewly, and the Speech Communication quality is good, effectively avoided traditional multi-path echo eliminate in problems such as " separating not unique ", " the filter imbalance is big ".
Description of drawings
Fig. 1 is the structural representation that the present invention is based on the multi-path echo eliminating system of SIMO channel blind discrimination;
Fig. 2 is the internal structure schematic diagram of multi-path echo arrester shown in Figure 1;
Fig. 3 is the internal structure schematic diagram of SIMO blind discrimination module shown in Figure 2;
Fig. 4 is the internal structure schematic diagram of g parameter cache module;
Fig. 5 is the multi-path echo removing method workflow diagram that the present invention is based on the multi-path echo eliminating system of SIMO channel blind discrimination.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, multi-path echo eliminating system based on the SIMO channel blind discrimination, comprise echo eliminator, microphone, loudspeaker, each near-end microphone connects far-end loudspeaker, otherwise, each far-end microphone also connects near-end loudspeaker, and each is to connecting an echo eliminator between microphone, the loudspeaker.
As shown in Figure 2, echo eliminator comprises SIMO blind discrimination module, the sound estimation module, the intercommunication detection module, the echo channel estimation module, convolution module, adder, SIMO blind discrimination module, the sound source estimation module, convolution module, adder connects successively, the output of sound source estimation module also is connected with SIMO blind discrimination module by the intercommunication detection module, and be connected with convolution module by the echo channel estimation module, SIMO blind discrimination module, the sound source estimation module is passed through m parallel input IX and m far-end microphone of echo eliminator simultaneously, the near-end loudspeaker connect, adder, the echo channel estimation module, the intercommunication detection module is connected with a near-end microphone by an input IY of echo eliminator, and adder output is connected with corresponding far-end loudspeaker by an output OUT of echo eliminator.
As shown in Figure 2, x
1(t) ..., x
m(t) be meant the signal of gathering by each microphone of echo eliminator IX input, m road altogether.x
1(t) ..., x
m(t) input to SIMO blind discrimination module, the output of this module is each required parameter g of FIR filter in the sound source estimation module
1..., g
mThe sound source estimation module is finished the estimation to sound source, and its output is sent to the echo channel estimation module on the one hand, carries out convolution with the output of echo channel estimation module on the other hand.The result of convolution promptly is the estimation to echo, and the estimation by the y (t) of IY input input deducts echo promptly can reach the purpose of eliminating echo.
The sound source estimation module is finished the calculating of following formula (1):
M is meant that the IX port has the input of m road in the formula (1), and the output of SIMO blind discrimination module also is the m road simultaneously.g
iBe τ value of i output of SIMO blind discrimination module (τ), detailed description is arranged in Fig. 4.x
i(t-τ) is road t-τ sample value input of IX input port i.N is the exponent number that obtains according to following formula (2):
Wherein l is that the room is long, and w is that the room is wide, and h is the room height, and v is a sampled voice speed, and c is the velocity of sound, probably is 340 meter per seconds, function
Round in the expression.
The echo channel estimation module is mainly finished the evaluation work of following formula (3):
μ is the iteration step length of setting in the formula 3.The output of echo channel estimation module
Its meaning is the characteristic estimating of echo channel, wherein
This module adopts adaptive filter method to estimate and renewal
It upgrades iterative formula is above-mentioned formula 3.At last, by formula (4) estimation echo, realize the echo elimination again by formula (5):
Y in the formula 5
Out(t) be the final output of having eliminated echo back echo arrester, symbol in the formula 4 " * " expression convolution.
The intercommunication detection module is to detect whether intercommunication of far-end room and near-end room speaker, and its input is the output of sound source estimation module
With the y (t) of IY input input, output is the result who judges.
As shown in Figure 3, SIMO blind discrimination module comprises m initial construction matrix module, m follow-up structural matrix module, total structural matrix module, the update calculation module, g parameter cache module, the 1st initial construction matrix module is connected with the 1st follow-up structural matrix module, m initial construction matrix module is connected respectively with the 1st～m follow-up structural matrix module, m follow-up structural matrix module is connected with total structural matrix module, total structural matrix module, the update calculation module, g parameter cache module connects successively, the update calculation module with the intercommunication detection module is connected.
SIMO blind discrimination module is from the m road signal of IX input input, and its corresponding initial construction matrix module is all followed on each road, as k road x
k(t), it connects k initial construction matrix module, and this module can be constructed X
k(N) matrix is as formula (6)
Element is as x in the matrix
k(N+2), N+2 sample value representing the input of k road.Wherein T is taken as 3N.X with each initial construction matrix module structure
k(N) send into follow-up matrix construction module, this module structure X
i(N) matrix, follow-up matrix construction module module is finished the work of formula (7), and it exports the X of each road correspondence
i(N) matrix.
At matrix X
i(N) in, every or be 0 matrix perhaps is matrix-block X
k(N), its size is (T-N+1) * (N+1).At last with each X
i(N) be aggregated into total structural matrix module, this module structure matrix X (N), the relation of structure such as formula (8).
X (N) is inputed to update module, and when the detection of intercommunication detection module was output as non-intercommunication, then this module was to the symmetrical matrix [X of [(N+1) m] * [(N+1) m]
T(N) X (N)] carry out feature decomposition, g is the characteristic vector of corresponding minimal eigenvalue, wherein:
g
k＝[g
k(N)，…，g
k(0)]
T，k＝1，…，m
Use g to upgrade g parameter cache module.If the detection of intercommunication detection module output result is intercommunication, does not then carry out aforementioned calculation, and do not upgrade g parameter cache module.
As shown in Figure 4, g parameter cache module comprises m memory, and the employed parameter of the in store sound source estimation module of g parameter cache module when not having both sides' intercommunication, can be provided with as required at set intervals and upgrade once; When if both sides' intercommunication is arranged, then needn't upgrade.
As shown in Figure 5, multi-path echo removing method based on the multi-path echo eliminating system of SIMO channel blind discrimination, comprise the elimination of parameter update and echo, parameter update and echo are eliminated parallel carrying out, parameter update is meant under the situation that does not have both sides' intercommunication, estimating or upgrading the contrary of far-end room impulse response is the g parameter, and echo path impulse response is a self adaptation echo channel characteristic estimating in the echo channel estimation module
If there is intercommunication in both sides, echo is eliminated and is proceeded, but parameter is not upgraded; Echo is eliminated and is meant that at the contrary of known far-end room impulse response be on the basis of g parameter, estimates far-end room source signal
Estimation in conjunction with echo path impulse response
And then obtain the estimation of echo-signal
The received signal y of near-end room microphone (t) deducts the estimation of echo-signal
The echo that is eliminated clean signal afterwards, thus reach the purpose that echo is eliminated.
The course of work that echo is eliminated is:
(1) the g parameter cache module in the SIMO blind discrimination module is carried out initialization, and to self adaptation echo channel characteristic estimating in the echo channel estimation module
Carry out initialization;
(2) by g parameter cache module the g parameter is sent into the sound source estimation module, simultaneously far-end room microphone signal x
1(t) ..., x
m(t) also be transfused to the sound source estimation module, the sound source estimation module is handled the estimated value that draws far-end room sound-source signal
And will
Send intercommunication detection module and echo channel estimation module to;
(3) the echo channel estimation module receives
After, will
With
Convolution obtains the estimation of echo
(4) estimation of echo
Be sent to adder after the negate, the signal y (t) that the near-end room microphone of input summer receives deducts echo and estimates
Obtain
For going echo clean signal afterwards, realize the echo elimination;
(5) return step (2), proceed echo and eliminate.
The course of work of parameter update is:
(1) intercommunication detection module cycle time (0.3～2 second) detects and judges whether to exist the intercommunication signal, and will detect judged result and be input to SIMO blind discrimination module and echo channel estimation module, whether decision carries out parameter update, if there is both sides' intercommunication, need not carry out parameter update, if there is not both sides' intercommunication, then carry out step (2) and step (3).
(2) SIMO blind discrimination module is to the x of input
1(t) ..., x
m(t) and y (t) handle, result sends the update calculation module to, to upgrade the g parameter in the g parameter cache module;
(3) obtain new echo channel estimated parameter promptly by adaptive algorithm
And to the former preservation of echo channel estimation module
Upgrade.
The course of work that intercommunication is judged is:
(1) by down trigger cycle time, the intercommunication detection module calculates
And the coefficient correlation between the y (t)
(2) judge coefficient correlation ξ and threshold values c
1Magnitude relationship, c wherein
1Be positive number, get c
1=0.1～0.5, if
Think and do not have both sides' intercommunication; Otherwise think and have both sides' intercommunication.
As mentioned above, just can realize the present invention preferably.
Claims (8)
1, multi-path echo eliminating system based on the SIMO channel blind discrimination, it is characterized in that comprising echo eliminator, microphone, loudspeaker, the near-end microphone, it is right that the far-end loudspeaker connect into one to one, each is to microphone, connect an echo eliminator between the loudspeaker, described echo eliminator comprises SIMO blind discrimination module, the sound estimation module, the intercommunication detection module, the echo channel estimation module, convolution module, adder, described SIMO blind discrimination module, the sound source estimation module, convolution module, adder connects, the output of described sound source estimation module also is connected with SIMO blind discrimination module by the intercommunication detection module, and be connected with convolution module by the echo channel estimation module, described SIMO blind discrimination module, the sound source estimation module is passed through m parallel input IX and m far-end microphone of echo eliminator simultaneously, the near-end loudspeaker connect, described adder, the echo channel estimation module, the intercommunication detection module is connected with a near-end microphone by an input IY of echo eliminator, and the output of adder is connected with corresponding far-end loudspeaker by an output OUT of echo eliminator.
2, by the described multi-path echo eliminating system of claim 1 based on the SIMO channel blind discrimination, it is characterized in that: described SIMO blind discrimination module comprises m initial construction matrix module, m follow-up structural matrix module, total structural matrix module, the update calculation module, g parameter cache module, described the 1st initial construction matrix module is connected with the 1st follow-up structural matrix module, m initial construction matrix module is connected respectively with the 1st～m follow-up structural matrix module, described m follow-up structural matrix module is connected with total structural matrix module, total structural matrix module, the update calculation module, g parameter cache module connects successively, the update calculation module with described intercommunication detection module is connected.
3, by the described multi-path echo eliminating system based on the SIMO channel blind discrimination of claim 2, it is characterized in that: described g parameter cache module comprises m memory.
4, the multi-path echo removing method of the described multi-path echo eliminating system based on the SIMO channel blind discrimination of claim 1, it is characterized in that comprising the elimination of parameter update and echo, described parameter update and echo are eliminated parallel carrying out, described parameter update is meant under the situation that does not have both sides' intercommunication, estimating or upgrading the contrary of far-end room impulse response is the g parameter, and echo path impulse response is a self adaptation echo channel characteristic estimating in the echo channel estimation module
If there is intercommunication in both sides, echo is eliminated and is proceeded, but parameter is not upgraded; Described echo is eliminated and is meant that at the contrary of known far-end room impulse response be on the basis of g parameter, estimates far-end room source signal (t), in conjunction with the estimation of echo path impulse response
And then obtain the estimation of echo-signal
The received signal y of near-end room microphone (t) deducts the estimation of echo-signal
The echo that is eliminated clean signal afterwards, thus reach the purpose that echo is eliminated.
5,, it is characterized in that the step that described echo is eliminated comprises by the multi-path echo removing method of the described multi-path echo eliminating system based on the SIMO channel blind discrimination of claim 4:
(1) the g parameter cache module in the SIMO blind discrimination module is carried out initialization, and to self adaptation echo channel characteristic estimating in the echo channel estimation module
Carry out initialization;
(2) by g parameter cache module the g parameter is sent into the sound source estimation module, simultaneously far-end room microphone signal x
1(t) ..., x
m(t) also be transfused to the sound source estimation module, the sound source estimation module is handled the estimated value (t) that draws far-end room sound-source signal, and sends (t) to intercommunication detection module and echo channel estimation module;
(3) after the echo channel estimation module receives (t), will
With (t) convolution, obtain the estimation of echo
(4) estimation of echo
Be sent to adder after the negate, the signal y (t) that the near-end room microphone of input summer receives deducts echo and estimates
Obtain
For going echo clean signal afterwards, realize the echo elimination;
(5) return step (2), proceed echo and eliminate.
6, by the multi-path echo removing method of the described multi-path echo eliminating system based on the SIMO channel blind discrimination of claim 4, it is characterized in that the step of described parameter update comprises:
(1) detection cycle time of intercommunication detection module judges whether to exist the intercommunication signal, and will detect judged result and be input to SIMO blind discrimination module and echo channel estimation module, whether decision carries out parameter update, if there is both sides' intercommunication, need not carry out parameter update, if there is not both sides' intercommunication, then carry out step (2) and step (3).
(2) SIMO blind discrimination module is to the x of input
1(t) ..., x
m(t) and y (t) handle, result sends the update calculation module to, to upgrade the g parameter in the g parameter cache module;
(3) obtain new echo channel estimated parameter promptly by adaptive algorithm
And to the former preservation of echo channel estimation module
Upgrade.
7, by the multi-path echo removing method of the described multi-path echo eliminating system based on the SIMO channel blind discrimination of claim 6, it is characterized in that: be 0.3～2 second described cycle time.
8,, it is characterized in that the step that described intercommunication is judged is by the multi-path echo removing method of the described multi-path echo eliminating system based on the SIMO channel blind discrimination of claim 6:
(1) by down trigger cycle time, the intercommunication detection module calculates the coefficient correlation ξ ( (t), y (t)) between (t) and the y (t);
(2) judge coefficient correlation ξ and threshold values c
1Magnitude relationship, c wherein
1Be positive number, get c
1=0.1～0.5, if | ξ ( (t), y (t)) |＞c
1, thinking does not have both sides' intercommunication; Otherwise think and have both sides' intercommunication.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101203061B (en) * | 2007-12-20 | 2011-07-20 | 华南理工大学 | Method for parallel processing real time gathering mixed audio blindness separating unit |
| CN107005763A (en) * | 2014-11-25 | 2017-08-01 | 美商楼氏电子有限公司 | For non-linear and time-varying Echo cancellation reference microphone |
| WO2018130224A1 (en) * | 2017-01-16 | 2018-07-19 | Huawei Technologies Co., Ltd. | Multi-stage echo cancelation scheme to run fdx in coax cable plant |
-
2006
- 2006-03-13 CN CN200610034214A patent/CN100588212C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101203061B (en) * | 2007-12-20 | 2011-07-20 | 华南理工大学 | Method for parallel processing real time gathering mixed audio blindness separating unit |
| CN107005763A (en) * | 2014-11-25 | 2017-08-01 | 美商楼氏电子有限公司 | For non-linear and time-varying Echo cancellation reference microphone |
| WO2018130224A1 (en) * | 2017-01-16 | 2018-07-19 | Huawei Technologies Co., Ltd. | Multi-stage echo cancelation scheme to run fdx in coax cable plant |
| US10361748B2 (en) | 2017-01-16 | 2019-07-23 | Futurewei Technologies, Inc. | Multi-stage echo cancelation scheme to run FDX in coax cable plant |
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| CN100588212C (en) | 2010-02-03 |
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