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Adaptive method, applied to echo cancellation, of active factor proportional sub band

An activity factor, echo cancellation technology, applied in speech analysis, instruments, etc., can solve problems such as reducing the convergence speed and affecting the convergence speed of the algorithm.

Inactive Publication Date: 2015-11-18
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the traditional PNSAF algorithm relies on some preset parameters, and these parameters affect the convergence speed of the algorithm.
The IPNSAF algorithm shows the defect of reduced convergence speed under high sparse impulse response

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  • Adaptive method, applied to echo cancellation, of active factor proportional sub band
  • Adaptive method, applied to echo cancellation, of active factor proportional sub band
  • Adaptive method, applied to echo cancellation, of active factor proportional sub band

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specific Embodiment approach

[0043] A kind of embodiment of the present invention is: a kind of adaptive method of active factor proportional subband is applied to echo cancellation, and its steps are as follows:

[0044] A. Signal segmentation

[0045] Sampling the signal from the far end to obtain the discrete value x(t) of the remote signal; the discrete value x(t) of the remote signal between the current time n and time n-L+1 constitutes the filter of the current time n Input signal X(n), ie X(n)=[x(n),x(n-1),...,x(n-L+1)] T ; L=512 is the number of taps of the filter, and the superscript T represents the transpose operation;

[0046] The filtered input signal X(n) is divided into N filtered input subband signals X by the analysis filter i (n), X i (n)=[x i (n), x i (n-1),...,x i (n-L+1)] T ; At the same time, the near-end signal d(n) with echo at the current moment n picked up by the near-end microphone is also divided into N near-terminal band signals d by the analysis filter i (n); Wherein,...

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Abstract

Discloses is an adaptive method, applied to echo cancellation, of an active factor proportional sub band. The method comprises the steps: A, dividing an adaptive echo cancellation sub band filter input vector X(n) formed by a discrete value of a far-end signal into a sub band signal X(n), B, through N extraction, obtaining an input sub band signal X(k) after the extraction and a near-end sub band signal d(k), C, obtaining a filtering value y(k) of the input sub band signal X<i(k) after the extraction via an adaptive echo cancellation sub band filter, D, sending a sub band error signal e(k), obtained through calculation, after the echo cancellation to a far end, E, obtaining a sub band filter step length u(k) through calculation of an active factor f<l>(k) and a proportional matrix G(k) by utilizing a set membership filtering algorithm, and updating a weight coefficient vector W(k), and F, enabling k to meet an expression k=k+1, and repeating A-E steps until an end of a call. The method has the advantages of the high identification ability for a sparse system of call communication, the rapid convergence speed, the low steady-state error, the high tracking capability for a jump system and the good echo cancellation effect; and the method is easy to implement.

Description

technical field [0001] The invention relates to an adaptive echo cancellation method for active factor-proportional subbands, and belongs to the technical field of echo cancellation for voice communication. Background technique [0002] The existence of echo in modern communication systems seriously affects the quality of calls. Therefore, how to take an effective method to eliminate the echo, thereby improving the quality of communication has become one of the hottest topics in the field of signal processing. At present, research on the application of echo cancellation is mainly divided into two aspects: acoustic echo cancellation and network echo cancellation. There are also various options for echo cancellation. For acoustic echo, modify the surrounding acoustic environment to achieve the effect of echo cancellation, such as using sound-absorbing wallpaper materials to reduce sound reflection. In addition, the echo suppressor is an echo control scheme commonly used in ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208
Inventor 赵海全董银霞
Owner SOUTHWEST JIAOTONG UNIV
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