Residual echo estimating method and device

Abstract

The invention provides a residual echo estimating method and device, and belongs to the technical field of voice signal processing. The method comprises that a residual error signal and an aligned far-end signal are obtained; a power spectrum of the residual error signal, a first power spectrum of the aligned far-end signal and a coherent function of the aligned far-end signal are obtained; a self-adaptive smoothing parameter is calculated and obtained; on the basis of the self-adaptive smoothing parameter and a preset rule, a second power spectrum of the aligned far-end signal is obtained; and according to the coherent function of the second power spectrum of the aligned far-end signal, an estimated value of residual echo is obtained. Thus, the residual echo can be estimated accurately.

Description

technical field [0001] The present invention relates to the technical field of speech signal processing, in particular to a residual echo estimation method and device. Background technique [0002] In the actual speaker and microphone loop system, due to factors such as the nonlinear frequency response of the power amplifier, the nonlinear vibration of the speaker, and the nonlinear frequency response of the microphone, it is difficult for linear echo cancellation to completely eliminate the echo, and the residual echo has a rapid change rate. , The characteristic of large energy dynamic range. The residual echo suppression module of the existing echo cancellation technology generally has the problem of underestimating the estimation of the residual echo, which leads to insufficient residual echo suppression and seriously affects the sense of hearing. In engineering, the underestimated residual echo will be empirically suppressed. Although this method can eliminate the echo...

AI Technical Summary

Problems solved by technology

The residual echo suppression module of the existing echo cancellation technology generally has the problem of underestimating the estimation of the residual echo, which leads to insufficient residual echo suppression and seriously affects the sense of hearing

In engineering, the underestimated residual echo will be empirically suppressed. Although this method can eliminate the echo, the part of the speech that overlaps with the echo will also be suppressed, resulting in speech distortion or even elimination.

Images