Method for transmitting coefficients of double-filter and device thereof

A filter coefficient, double filter technology, applied in the direction of instruments, speech analysis, etc., can solve the problems of non-normalization, deterioration of the effect of the echo cancellation system, and inability to eliminate the echo very well.

Active Publication Date: 2011-07-06
NEW H3C TECH CO LTD
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Problems solved by technology

[0010] In the above formula, the quality factor q i The value of is related to the energy of the input signal, and the value range is not normalized, which is (-∞, +∞), so the preset constants A, B, C, and α are difficult to set in the actual environment. When the auxiliary filter does not converge well, it transfers its filter coefficients to the main filter, so that the main filter cannot cancel the echo very well, which seriously affects the echo cancellation effect of the double filter, and the effect of the echo cancellation system deteriorates

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  • Method for transmitting coefficients of double-filter and device thereof
  • Method for transmitting coefficients of double-filter and device thereof
  • Method for transmitting coefficients of double-filter and device thereof

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[0023] In the technical solution of the present invention, in order to carry out echo cancellation more effectively, select η i = Ed ( n ) y i ^ ( n ) σ d 2 σ y ^ i 2 As a quality factor to reflect the convergence degree of the main filter and the auxiliary filter, i=a, p, where a represents the auxiliary filter and p represents the main filter. in, What is obtained is the double filter input signal d(n) and the echo estimation signal generated by the filter The correlation of σd2 and ...

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Abstract

The invention discloses a method for transmitting coefficients of a double-filter and a device thereof; the degree of convergence of the filter is represented by using normalized quality factor; the quality factor is irrelevant with an input signal so as to facilitate the threshold value setting for judging whether the filter is in convergence and improve the accuracy of the threshold value setting; therefore, the method and the device are beneficial for the echo eliminating effect of the double-filter and ensure the normal operation of double-filter echo eliminating mechanism.

Description

technical field [0001] The invention relates to the echo cancellation technology, in particular to a method and device for transferring filter coefficients of a double filter used for echo cancellation. Background technique [0002] Echo is the repetition of sound due to the reflection of sound waves. During a call, if the speaker hears a delayed version of himself speaking, there is an echo problem. [0003] According to the cause of echo, echo can be divided into two types: acoustic echo and electrical echo. Electrical echoes are caused by circuit impedance mismatches. Acoustic echo means that the sound played by the speaker is picked up by the microphone and sent back to the far end, which allows the far end talker to hear their own voice. Acoustic echo is divided into direct echo and indirect echo. Direct echo means that the sound played by the speaker goes directly to the microphone without any reflections. Indirect echo refers to the collection of echoes generated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L19/26
Inventor 封伶刚张文丰段长春朱旭东
Owner NEW H3C TECH CO LTD
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