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Echo elimination method, apparatus and system, and storage medium

A technology of echo cancellation and variance, which is applied in the field of voice interaction and communication, can solve the problems of poor echo cancellation effect and inaccurate estimation, and achieve the effect of accurate variance and enhanced echo cancellation effect

Active Publication Date: 2018-05-08
VOICEAI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide an echo cancellation method, device, system and storage medium for the problem that the estimation of the near-end signal variance is not accurate enough, resulting in poor echo cancellation effect

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  • Echo elimination method, apparatus and system, and storage medium
  • Echo elimination method, apparatus and system, and storage medium
  • Echo elimination method, apparatus and system, and storage medium

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Embodiment Construction

[0044] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0045] figure 1 A principle diagram of echo cancellation shown in an exemplary embodiment of the present invention, as shown in figure 1 As shown, the far-end signal such as the loudspeaker playback signal x(n) is acoustically propagated (can be modeled as an echo path h(n)), and the echo signal y(n) is obtained, where n refers to the time index, and the signal y( n) is added to the local sign...

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Abstract

The invention relates to an echo elimination method, an apparatus and a system, and a computer readable storage medium. The method comprises the following steps of acquiring and estimating characteristic parameters of a local signal, wherein the characteristic parameters include a current frame reference signal emitted by a sound production device, a signal received by a current frame microphone and a previous frame adaptive filter coefficient; converting the characteristic parameters into frequency domain signals respectively; according to the converted frequency domain signals, estimating the local signal; calculating a variance of the local signal; and according to the variance of the local signal, updating a step length factor and a regularization factor of an adaptive filter. Throughcarrying out FFT(fast Fourier transform) on the acquired characteristic parameters used for estimating the local signal, time domain signals are converted into the frequency domain signals. Sparsity and distinguishability of the frequency domain signals are used so that the local signal estimated through the frequency domain signals and the calculated variance of the local signal are accurate, which is good for enhancing an echo elimination effect.

Description

technical field [0001] The invention relates to the fields of communication and voice interaction, in particular to an echo cancellation method, device, system and storage medium. Background technique [0002] In fields such as real-time communication and voice interaction, it is usually necessary to install a microphone and a speaker on the device. The speaker is responsible for playing music, stories, synthesized human voice or the sound sent by the communication peer, and the microphone is used to collect the sound. In real-time communication and voice interaction, the sound played by the speaker is re-collected by the microphone, and these sounds are called echoes. The echo will seriously interfere with the subsequent identification of the machine and affect the subjective experience of the communication peer, so filtering the echo is an essential step. [0003] The traditional echo canceling device usually includes an adaptive filter, a double-talk detector and a post...

Claims

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Application Information

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IPC IPC(8): G10L21/0208G10L21/0216G10L21/0232G10L25/06
CPCG10L21/0208G10L21/0216G10L21/0232G10L25/06G10L2021/02082
Inventor 张伟彬
Owner VOICEAI TECH CO LTD
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