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An Adaptive Echo Cancellation Method

An echo cancellation and self-adaptive technology, used in two-way sound reinforcement telephone systems, speech analysis, instruments, etc., can solve the problem of real-time adjustment of the adaptive step factor without echo intensity, and the inability to ensure the accuracy of echo cancellation.

Active Publication Date: 2019-09-03
CHONGQING UNIV OF EDUCATION
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Problems solved by technology

[0004] The problem with the existing solution is that: on the one hand, the updating of the adaptive filter coefficients is not related to the filtering effect (residual signal), and the adaptive step factor is not adjusted in real time according to the echo intensity, which cannot be well guaranteed in various The Accuracy of Echo Cancellation in the Voice State

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  • An Adaptive Echo Cancellation Method
  • An Adaptive Echo Cancellation Method
  • An Adaptive Echo Cancellation Method

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specific Embodiment

[0037] This embodiment is a preferred implementation manner of the adaptive echo cancellation method of the present invention.

[0038] see figure 1 , the flow of the adaptive echo cancellation method in this embodiment is as follows figure 1 shown, including:

[0039] S1. Estimating the echo signal y(k) through an adaptive filter according to the reference signal x(k) of the pronunciation unit;

[0040] As a preferred implementation of this embodiment, this step may also include:

[0041] S101. Convert the reference signal x(k) of the speaker unit into a frequency domain reference signal X(f).

[0042] X(f)=FFT[x(k-M),...,x(k),...,x(k+M-1)]

[0043] S102. Estimating the frequency-domain echo signal Y(f),

[0044] Among them, W(f) is the current adaptive filter coefficient;

[0045] S103. Obtain the y(k) according to the Y(f):

[0046] y(k)=IFFT[Y(f)]

[0047] Wherein, the FFT is a Fourier transform, and the IFFT is an inverse Fourier transform;

[0048] In this exa...

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Abstract

The invention discloses an adaptive echo cancellation method comprising the steps of estimating an echo signal y(k) by an adaptive filter according to a reference signal x(k) of a sound emitting unit; computing a residual signal e(k) according to y(k) and a signal d(k) collected by a microphone; computing a power spectrum xPow(f) of a frequency domain reference signal X(f); computing a power spectrum ePow(f) of a frequency domain residual signal E(f); computing a related power spectrum xePow(f) of a conjugate residual signal E*(f) of E(f) and X(f); computing a related coefficient cohxe(f) of X(f) and E*(f); and using cohxe(f) as an adaptive step length factor of the adaptive filter to update an adaptive filter coefficient. According to the technical scheme of the method provided by the invention, the related coefficient between the residual signal and the reference signal is used as the adaptive step length factor, and thus effective echo cancellation can be performed on each voice state.

Description

technical field [0001] The invention relates to the echo processing technology in the process of real-time voice communication and human-computer interaction, in particular to an adaptive echo cancellation method. Background technique [0002] In the process of real-time voice communication, the sound from the speaker of the communication terminal will always be picked up by the microphone of the terminal. If it is sent out without processing, the other party can always hear his own voice; The sound emitted is picked up by the microphone, and the voice of the controller is picked up at the same time. If the voice from the interactive terminal is not eliminated in the signal picked up by the microphone, the interactive terminal will introduce strong interference when recognizing the voice of the controller, reducing the The success rate of recognition is reduced, which eventually causes difficulty in interaction. [0003] Aiming at the problem of echo interference in the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08G10L21/0264G10L21/0232
Inventor 付仕明韦鹏程刘芬程雪峰付红王洋吴广富蒋文豪
Owner CHONGQING UNIV OF EDUCATION
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