Zero attraction based adaptive echo elimination method of affine projection

A technology of affine projection and echo cancellation, applied in two-way sound reinforcement telephone systems, telephone communications, electrical components, etc., can solve problems such as slow convergence speed, achieve the effects of reducing steady-state error, increasing convergence speed, and suppressing interference

Active Publication Date: 2019-01-04
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, for the echo cancellation system with higher sparsity and more zero-valued weight coefficients, it does not accelerate the operation of small weight coefficients, resulting in a slow convergence speed

Method used

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  • Zero attraction based adaptive echo elimination method of affine projection
  • Zero attraction based adaptive echo elimination method of affine projection
  • Zero attraction based adaptive echo elimination method of affine projection

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Embodiment

[0052] A specific embodiment of the present invention is an affine projection adaptive echo cancellation method based on zero attraction, the steps of which are as follows:

[0053] A. Remote signal processing

[0054] Sampling the remote signal from the far end to obtain the discrete value x(n) of the remote signal at the current time n, and comparing the discrete value x(n) of the remote signal at the current time n with the previous L-1 time, x(n -1),...,x(n-L+1), constituting the adaptive 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; T represents the transpose operation;

[0055] The adaptive filter input vector X(n), X(n-1),...,X(n-p+1)) of the current time n and the previous p-1 time, constitutes the simulation of the current time n Projection projection input matrix U(n), U(n)=[X(n),X(n-1),...,X(n-p+1)], where p is the order of affine projection, p=2~8;

[0056] B. Echo estimation ...

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Abstract

The invention discloses a zero attraction based adaptive echo elimination method of affine projection. The method comprises the following steps of A) far-end signal processing in which a far-end signal from the far end is sampled to obtain a far-end signal discrete value x(n) of present time n, and an adaptive filter input vector X(n) and an affine projection matrix U(n) of the present time are constructed; B) echo estimation in which an output value y(n), namely an echo estimated value y(n) is obtained by an adaptive filter from the filter input vector X(n); C) echo offset in which a near-endmicrophone picks up a near-end signal d(n) with an echo at the present time n, and the near-end signal d(n) with the echo at the present time n is subtracted from the output value y(n) of the adaptive filter at the present time n to obtain a residual error signal e(n); D) construction of a proportional affine projection matrix; E) calculation of a zero attraction factor; F) update of a weight coefficient vector, and G) repetition. The method is high in identification capability and convergence speed, low in stable error and good in echo elimination effect.

Description

technical field [0001] The invention belongs to the technical field of self-adaptive echo cancellation for communication. Background technique [0002] In voice-based communication systems (such as hands-free phones, video conference systems, etc.), voice quality is usually affected by echoes, mainly acoustic echoes. Take video conference as an example, because the speaker and the microphone are placed in the same space, the far-end voice from the local speaker is received by the local near-end microphone and transmitted back to the far-end, causing the far-end speaker to hear his own voice. Due to the serious impact of echo on communication quality, researchers have proposed various methods to eliminate echo. Among them, adaptive echo cancellation technology has low cost and good effect, and has been unanimously recognized by researchers. It is currently the most promising echo cancellation technology recognized internationally, and it is also the main technology used in e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08
CPCH04M9/085
Inventor 赵海全王文渊
Owner SOUTHWEST JIAOTONG UNIV
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