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Echo Cancellation Method Based on Block Sparse Proportional Reuse Weight Coefficient Affine Projection

An affine projection and echo cancellation technology, applied in the field of adaptive echo cancellation in communication, can solve problems such as slow convergence speed, achieve the effect of fast convergence speed, strong decorrelation effect, and enhanced anti-interference ability

Active Publication Date: 2019-01-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, under the low SNR system, the convergence speed of this method is still slow because the weight coefficient method is not used to eliminate the influence of high noise on the system

Method used

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  • Echo Cancellation Method Based on Block Sparse Proportional Reuse Weight Coefficient Affine Projection
  • Echo Cancellation Method Based on Block Sparse Proportional Reuse Weight Coefficient Affine Projection
  • Echo Cancellation Method Based on Block Sparse Proportional Reuse Weight Coefficient Affine Projection

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Embodiment Construction

[0043] A specific embodiment of the present invention is an echo cancellation method based on affine projection of block sparse proportional reuse of weight coefficients, the steps of which are as follows:

[0044] A. Remote signal filtering

[0045] A1. Sampling the remote signal from the remote end to obtain the remote signal discrete value x(n) at the current time n, the value x(n) of the remote signal discrete value x(n) at the time n to n-L+1 ), x(n-1),..., x(n-L+1) constitute the filter input vector X(n) at the current moment n, X(n)=[x(n), x(n- 1),...,x(n-L+1)] T , where L=512 is the number of filter taps, and T represents the transpose operation;

[0046] A2. Pass the input vector X(n) of the filter at the current time n through the adaptive filter to obtain the filter output value y(n) at the current time n, y(n)=X T (n)w(n); Wherein w(n) is the tap weight coefficient vector of adaptive echo cancellation filter current moment n, w(n)=[w 1 (n),w 2 (n),...w l (n),...

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Abstract

An echo cancellation method based on block sparse proportional reuse weight coefficient affine projection, the steps are mainly: A, far-end signal filtering, the filter input vector X (n) through the adaptive filter to obtain the output value y (n ); B, echo cancellation, the near-end microphone picks up the near-end signal d(n) with echo at the current moment and the error after subtracting the filter output value y(n) is the residual signal e(n), e (n)=d(n)-y(n), and sent back to the far end; C, filter tap weight vector update; D, make n=n+1, repeat the steps of A, B, C until the call Finish. The method has strong echo cancellation ability for voice communication of sparse system, fast convergence speed, small steady-state error and good echo cancellation effect.

Description

technical field [0001] The invention belongs to the technical field of self-adaptive echo cancellation for communication. Background technique [0002] With the development of science and technology, multi-functional and multi-type communication applications have been emerging one after another. While enjoying the convenience, users will also encounter the trouble caused by the echo problem in communication. According to the mechanism of echo generation, echo can be divided into acoustic echo and electrical echo. Electric echo is usually relatively small, so the focus of current echo cancellation research has shifted to acoustic echo cancellation. In the process of communication, the mechanism of acoustic echo is that the voice of the far-end speaker is played by the near-end speaker, and then it is received by the microphone and transmitted to the far-end speaker, so that he can hear his own voice again, thus forming an acoustic echo. echo. Acoustic echo will make commun...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
CPCH04M9/08
Inventor 赵海全刘倩倩
Owner SOUTHWEST JIAOTONG UNIV
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