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A zero-norm subband echo cancellation method

A subband and subband technology, applied in the field of zero-norm subband echo cancellation, can solve problems such as algorithm performance degradation and achieve good stability and good tracking ability

Active Publication Date: 2019-03-22
杭州东南吉通网络有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the performance of this algorithm has been improved to a certain extent, when the system is sparse, the L 1 The norm cannot accurately reflect the real situation of sparsity, so the performance of the algorithm will also deteriorate

Method used

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  • A zero-norm subband echo cancellation method
  • A zero-norm subband echo cancellation method
  • A zero-norm subband echo cancellation method

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Experimental program
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Embodiment

[0048] A kind of specific embodiment of the present invention is, a kind of zero-norm sub-band echo cancellation method, its steps are as follows:

[0049] A zero-norm sub-band echo cancellation method, the steps are as follows:

[0050] A. Signal sampling

[0051] The remote sampling signal between the current time n and the time n-L+1 is composed of the input signal sequence U(n) at the current time n, U(n)=[u(n), u(n-1), ..., u(n-L+1)], where u(n) is the input signal at the current time n; the near-end microphone sampling signal between the current time n and the time n-L+1 is composed of the current time n band Echoed desired signal sequence D(n), D(n)=[d(n),d(n-1),…,d(n-L+1)], where d(n) is the current moment n The desired signal; L=512 is the number of filter taps;

[0052] B. Signal segmentation

[0053] The input signal sequence U(n) obtained in step A is divided into I sub-band input signal sequences U at the current moment n through the analysis filter bank i (n...

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Abstract

The invention discloses a method for eliminating zero norm sub-band echo. The method comprises the following steps: A, signal sampling; B, signal segmentation; C sub-band signal extraction; D, input matrix composition; E, formation of a sub-band output signal; F, echo signal elimination; and G. updating a filter tap coefficient. A constraint condition with a posteriori error (the difference between a current expected signal di(k) and an output signal of a next moment) is added in a weight coefficient vector update formula, so that a zero norm adjustment factor is introduced in the weight coefficient vector update, and thus the output signal of the filter can obtain faster astringency and lower steady state misadjustment in the case of related input signals and sparse systems.

Description

technical field [0001] The invention relates to a zero-norm sub-band echo cancellation method, which belongs to the technical field of echo cancellation in communication. Background technique [0002] As an important branch of information technology, adaptive signal processing has been widely used in the field of communication. In the field of communication, echo cancellation is a hot spot that attracts much attention and challenges. The sound will form an echo after multiple reflections in a closed space, and the echo will also be formed in the signal transmission due to the impedance mismatch in the transmission medium. The communication echo can be eliminated by the system identification model: the identified system is the echo channel, and the output of the system identification is the estimate of the echo signal, and the echo can be eliminated by subtracting the voice signal containing the echo signal from the estimate of the echo signal, which is The principle of ada...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
CPCH04M9/085
Inventor 赵海全施龙
Owner 杭州东南吉通网络有限公司
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