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Convex constraint adaptive echo cancellation method

An echo cancellation and self-adaptive technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of non-convergence of the CRRLS algorithm, and achieve the effects of accelerating the convergence speed, strong impact resistance, and reducing steady-state imbalance

Active Publication Date: 2020-06-05
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, when the background noise of the system is disturbed by the impact noise, the CRRLS algorithm will face the problem of non-convergence

Method used

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  • Convex constraint adaptive echo cancellation method
  • Convex constraint adaptive echo cancellation method
  • Convex constraint adaptive echo cancellation method

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Experimental program
Comparison scheme
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Embodiment

[0047] A specific embodiment of the present invention is a convex-constrained adaptive echo cancellation method, the steps of which are as follows:

[0048] A. Remote signal sampling

[0049] Combine the remote sampling signals x(n), x(n-1),...,x(n-L+1) at the current time n and the previous L-1 time to form the input signal vector X(n ), X(n)=[x(n),x(n-1),…,x(n-L+1)] T ; Wherein, superscript T represents transpose, and L is the tap length of adaptive filter, and the value is 32, 64 or 128;

[0050] B. Echo signal estimation

[0051] Pass the input signal vector X(n) at the current time n through the filter to obtain the estimated value y(n) of the echo signal at the current time n, that is, y(n)=W T (n)X(n), where W(n)=[w 1 (n),w 2 (n),...,w i (n),...w L (n)] T Be the filter tap weight coefficient vector of current moment n, its initial value is zero, namely W(0)=0, w i (n) is the ith tap weight coefficient of the filter of current moment n, i=1,2,3,...,L;

[0052] C....

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Abstract

The invention discloses a convex constraint adaptive echo cancellation method. The method comprises the following main steps: A, sampling a far-end signal; B, estimating echo signals; C, echo signal elimination; D, determining an error signal threshold: taking a median from the error signal square time window vector E (n) to obtain a variance correction amount alpha (n), and further obtaining an expected variance sigma 2 (n) of the M estimator; an M estimator threshold value xi (n) is obtained; E, calculating an error signal recognition value; F, weight vector updating: calculating a gain vector k (n), further updating the recursive matrix P (n) and the penalty vector gamma (n), and finally updating the filter weight vector; G, repeating. The invention has the advantages of better impact resistance and lower steady-state imbalance.

Description

technical field [0001] The invention relates to a convex constraint adaptive echo cancellation method. Background technique [0002] In recent years, the wide application of communication systems (such as hands-free phones, video conference systems, etc.) has made communication users have higher and higher requirements for call quality. The quality of voice calls is mainly affected by echo, which is the phenomenon that users hear their own voice repeatedly during the communication process. It has the characteristics of short delay, multi-path and time-varying. Currently, echo cancellation is still a hot research topic. The cost of the adaptive echo cancellation method is low, and it is recognized as the most promising echo cancellation technology, and it is also the mainstream technology of echo cancellation. [0003] The so-called adaptive echo cancellation technology is an echo cancellation method using an adaptive filter. For some unknown environments, the adaptive fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
CPCG10K11/17854
Inventor 赵海全汪艮
Owner SOUTHWEST JIAOTONG UNIV