Adaptive echo cancellation method adopting memory proportionate affine projection and based on M-estimation

A memory-proportional and affine projection technology, which is applied in two-way sound reinforcement telephone systems and other directions, can solve problems such as slow convergence speed and reduction of residual signal information

Inactive Publication Date: 2015-06-03
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, since the sign algorithm converts the entire residual signal into a single positive and negative signal

Method used

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  • Adaptive echo cancellation method adopting memory proportionate affine projection and based on M-estimation
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  • Adaptive echo cancellation method adopting memory proportionate affine projection and based on M-estimation

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Embodiment

[0041] A specific embodiment of the present invention is, a memory proportional affine projection adaptive echo cancellation method based on M estimation, the steps are as follows:

[0042] A. Remote signal sampling

[0043] Sampling the far-end signal from the far-end to obtain the discrete value x(n) of the far-end signal at time n, and forming the adaptive filter input vector X(n) at the current time n with the value of the previous L-1 time , 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;

[0044] B. Echo estimation

[0045] The adaptive filter input vector X(n) at the current moment n is passed through the adaptive filter to obtain the output value y(n) at the current moment n, that is, the estimated value y(n) of the echo, y(n)=X T (n)w(n); Wherein, w(n) is the tap weight vector of the adaptive filter of current moment n, w(n)=[w 1(n),w 2 (n),...,w L (n)] T , the initial value of w(n) is a z...

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Abstract

The invention discloses an adaptive echo cancellation method adopting memory proportionate affine projection and based on M-estimation. The adaptive echo cancellation method comprises the following steps: A, a remote signal is sampled; B, in echo estimation, a filter input vector X(n) passes through an adaptive filter and an output value y(n), namely an echo estimation value y(n), is obtained and equal to XT(n)w(n); C, in echo cancellation, a near-end signal d(n) with the echo, acquired by a near-end microphone and the output value y(n) of the adaptive filter are subjected to subtraction operation, and a return signal, namely a residual signal e(n), is returned to a far end and equal to d(n)-y(n); D, in updating of a tap weight vector of the filter, the method adopting memory proportionate affine projection and based on M-estimation is used and the tap weight vector w(n+1) of the adaptive filter at next moment n+1 is calculated and equal to w(n)+mu P(n)(UT(n)P(n)+delta IK)-1 psi [E(n)]; E, n is set to be n+1, and the steps B, C and D are repeated until a call is ended. The method has a good cancellation effect on an acoustic echo of a communication system and is high in convergence speed and small in steady-state error.

Description

technical field [0001] The invention relates to an adaptive echo cancellation method, which belongs to the technical field of communication echo cancellation. Background technique [0002] In a voice-based communication system (such as a hands-free phone, a video conference system, etc.), the voice quality is usually affected by the echo, mainly the acoustic echo, which seriously affects the call quality. Echo is a phenomenon in which sound or signal is reflected back to the signal source after delay or deformation. In communication systems such as voice communication, data communication, satellite communication, hands-free phone, and teleconferencing system, echo phenomenon exists to varying degrees. . 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 vo...

Claims

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Application Information

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IPC IPC(8): H04M9/08
Inventor 赵海全郑宗生
Owner SOUTHWEST JIAOTONG UNIV
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