A Frequency Domain Adaptive Echo Cancellation Method
An echo cancellation and self-adaptive technology, applied in two-way sound reinforcement telephone systems, etc., can solve the problems of real-time adjustment of the self-adaptive step factor without echo strength, and the inability to ensure the accuracy of echo cancellation.
Active Publication Date: 2019-09-17
CHONGQING UNIV OF EDUCATION
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[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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[0040] This embodiment is a preferred implementation manner of the frequency domain adaptive echo cancellation method of the present invention.
[0041] see figure 1 , the flow of the frequency domain adaptive echo cancellation method in this embodiment is as follows figure 1 shown, including:
[0042] S1. Estimating the echo signal y(k) through an adaptive filter according to the reference signal x(k) of the pronunciation unit;
[0043] As a preferred implementation of this embodiment, this step may also include:
[0044] S101. Convert the reference signal x(k) of the speaker unit into a frequency domain reference signal X(f).
[0045] X(f)=FFT[x(k-M),...,x(k),...,x(k+M-1)]
[0046] S102. Estimating the frequency-domain echo signal Y(f),
[0047] Among them, W(f) is the current adaptive filter coefficient;
[0048] S103. Obtain the y(k) according to the Y(f):
[0049] y(k)=IFFT[Y(f)]
[0050] Wherein, the FFT is a Fourier transform, and the IFFT is an inverse Fourie...
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The invention discloses a frequency-domain self-adaptive echo cancellation method. The frequency-domain self-adaptive echo cancellation method comprises the steps of: estimating an echo signal y(k) through a self-adaptive filter according to the reference signal x(k) of a pronunciation unit; calculating a residual signal e(k) according to the y(k) and a signal d(k) picked up by a microphone; calculating the power spectrum xPow(f) of a frequency-domain reference signal X(f); calculating the power spectrum xPow(f) of a frequency-domain residual signal E(f); calculating the related power spectrum xePow(f) of the conjugated residual signal E*(f) of the E(f) and the X(f); calculating the related coefficient cohxe(f) of the X(f) and the E*(f); calculating the average value cohxeaver of the cohxe(f) of all frequency points; and, taking the cohxeaver as the self-adaptive step length factor of the self-adaptive filter at various frequency points, and updating the coefficient of the self-adaptive filter. By means of the technical scheme in the invention, the average value of the related coefficients between the residual signal and the reference signal is used as the self-adaptive step length factor; and thus, effective echo cancellation can be carried out in various voice states.
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 a frequency domain self-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 in...
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IPC IPC(8): H04M9/08
Inventor 付仕明韦鹏程刘芬程雪峰付红王洋林峰蒋文豪
Owner CHONGQING UNIV OF EDUCATION