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Function connection type adaptive nonlinear echo cancellation method

An echo cancellation and adaptive technology, applied in speech analysis, instruments, etc., can solve problems such as performance degradation, achieve the effect of good effect, fast convergence speed, and improve modeling ability

Pending Publication Date: 2020-12-04
SICHUAN UNIV
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Problems solved by technology

However, when the echo path has nonlinear characteristics, the performance of traditional adaptive filtering algorithms, such as the least mean square algorithm (LMS) and the normalized least mean square algorithm (NLMS), will decline significantly.

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  • Function connection type adaptive nonlinear echo cancellation method
  • Function connection type adaptive nonlinear echo cancellation method
  • Function connection type adaptive nonlinear echo cancellation method

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Embodiment Construction

[0034] In order to improve the effect of echo cancellation, the present invention discloses a function connection type adaptive nonlinear echo cancellation method, which performs sigmoid nonlinear transformation processing and function connection extension processing on the remote input signal in the echo path respectively, and the processed The signals of are respectively filtered through the adaptive filter, and the weight of the adaptive filter is updated according to the filtering result, wherein the parameter value of the sigmoid transformation is based on the filtering result of the adaptive filter and the weight estimation. The present invention will be described in detail below through the embodiments and accompanying drawings.

[0035] Such as figure 1 As shown, the embodiment provides an improved function connection type adaptive nonlinear echo cancellation method, and its specific steps are as follows:

[0036] A. Collect remote input signal

[0037] Sampling the ...

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Abstract

The invention relates to the technical field of echo cancellation, and discloses a function connection type adaptive nonlinear echo cancellation method, which is used for improving the echo cancellation effect. According to the method, sigmoid nonlinear transformation processing and function connection extension processing are respectively carried out on far-end input signals in an echo path, theprocessed signals are respectively filtered through an adaptive filter, and the weight of the adaptive filter is updated according to a filtering result; wherein the parameter value of sigmoid conversion is based on the filtering result and weight estimation of the adaptive filter. The method is suitable for nonlinear echo cancellation processing.

Description

technical field [0001] The invention relates to the technical field of echo cancellation, in particular to a function connection type self-adaptive nonlinear echo cancellation method. Background technique [0002] In recent years, the continuous development of communication and network technology has made people put forward new requirements for the quality of communication, the most important of which is the quality of voice calls. Acoustic echo is one of the important factors that reduce the quality of voice calls. Echo is caused by the impulse response coupling effect of the echo path between the microphone and speaker. Since the human ear is very sensitive to the echo, the echo with a delay of more than 10ms can be captured by the human ear, and the echo with a delay of more than 32ms will seriously interfere with the call quality. Therefore, how to eliminate the acoustic echo has important practical significance. The most commonly used method at present is the echo ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216G10L25/27
CPCG10L21/0216G10L25/27
Inventor 王仁杰芦璐杨晓敏
Owner SICHUAN UNIV
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