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Zero-norm set membership affine projection adaptive echo cancellation method based on weight vector reuse

An affine projection and echo cancellation technology, applied in the field of zero-norm set membership affine projection adaptive echo cancellation, which can solve problems such as large steady-state errors

Active Publication Date: 2016-11-23
聊城来通国际贸易有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it still exhibits a large steady-state error in the case of strong background noise

Method used

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  • Zero-norm set membership affine projection adaptive echo cancellation method based on weight vector reuse
  • Zero-norm set membership affine projection adaptive echo cancellation method based on weight vector reuse
  • Zero-norm set membership affine projection adaptive echo cancellation method based on weight vector reuse

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Embodiment

[0052] A specific embodiment of the present invention is a zero-norm set member affine projection adaptive echo cancellation method based on weight vector reuse, the steps of which are as follows:

[0053] A. Remote signal sampling

[0054] The far-end signal x(n), x(n-1),...,x(n-L+1) obtained by sampling the far-end signal from the far-end at the current time n and the previous L-1 time Constitute the 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;

[0055] B. Echo estimation

[0056] Pass the input vector X(n) at the current time n through the adaptive filter to obtain the output value y(n) at the current time n, 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)..., w L (n)] T , the initial value of w(n) is a zero vector; w l (n) is the lth tap weight coefficient in the...

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Abstract

A zero-norm set membership affine projection adaptive echo cancellation method based on weight vector reuse comprises the following steps: A, remote signal sampling; B echo estimation: obtaining an output value y(n) at a current time n through an adaptive filter based on an input vector X(n) of the adaptive filter at the current time n, wherein y(n) is the estimated value of echo, and y(n)=X<T>(n)*w(n); C, echo cancellation: subtracting the output value y(n) of the adaptive filter at the current time n from a near-end signal d(n) with echo at the current time n picked up by a near-end microphone to get a residual signal e(n), wherein e(n)=d(n)-y(n), and transmitting the residual signal back to a remote end; D, filter tap weight vector updating: getting a tap weight vector w(n+1) (Please see the description for the expression) of the filter at next time n+1 using a zero-norm set membership affine projection method based on weight vector reuse; and E, letting n=n+1, and repeating the steps B, C and D until the end of the call. The method has the advantages of good cancellation effect for acoustic echo of a communication system, high convergence rate, and small steady-state error.

Description

technical field [0001] The invention relates to a zero-norm set member affine projection adaptive echo cancellation method based on weight vector reuse, and belongs to the technical field of echo cancellation for communication. Background technique [0002] With the advancement of the times, the development of science and technology, and the convenience of transportation, people in different regions communicate more and more frequently, people use communication equipment more and more frequently, and the requirements for voice call quality in communication terminals are also constantly improving. With the passage of time, people's communication methods are constantly changing, from the original simple pagers, mobile phones, and landline phones to the current mobile phones, TV phone systems, Internet phones and other communication devices. Comprehensive application. It is the most basic condition for a communication terminal to have a clear call quality to be a qualified com...

Claims

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Application Information

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IPC IPC(8): G10L21/0216G10L21/0208H04M9/08
CPCG10L21/0208G10L21/0216G10L2021/02082H04M9/082
Inventor 赵海全郑宗生
Owner 聊城来通国际贸易有限公司
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