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Echo cancellation method based on block-sparse proportionate reuse weight coefficient affine projection

An affine projection and echo cancellation technology, applied in the field of adaptive echo cancellation in communication, which can solve problems such as slow convergence speed

Active Publication Date: 2016-06-29
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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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

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  • Echo cancellation method based on block-sparse proportionate reuse weight coefficient affine projection
  • Echo cancellation method based on block-sparse proportionate reuse weight coefficient affine projection
  • Echo cancellation method based on block-sparse proportionate 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

The invention discloses an echo cancellation method based on block-sparse proportionate reuse weight coefficient affine projection. The method mainly comprises following steps of A, filtering a far-end signal; obtaining an output value y (n) from a filter input vector X (n) through a self-adaptive filter; B, cancelling an echo; subtracting the output value y (n) by near-end signal d (n) which is picked up by a near-end microphone at a current moment and is equipped with the echo, thus obtaining an error as a residual signal e (n), wherein e (n) is equal to d (n)-y(n); sending back to a far-end; C, updating a filter tapping weight vector; D, assuming that n is equal to n+1, repeating steps A, B and C until finishing a call. According to the method, the echo elimination capability to the voice communication of a sparse system is high; the rate of convergence is high; the steady state error is low; and the echo elimination effect is good.

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...

Claims

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Application Information

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IPC IPC(8): H04M9/08
CPCH04M9/08
Inventor 赵海全刘倩倩
Owner SOUTHWEST JIAOTONG UNIV
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