Adaptive echo cancellation method adopting memory proportionate affine projection and based on M-estimation
A memory-proportional and affine projection technology, which is applied in two-way sound reinforcement telephone systems and other directions, can solve problems such as slow convergence speed and reduction of residual signal information
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[0041] A specific embodiment of the present invention is, a memory proportional affine projection adaptive echo cancellation method based on M estimation, the steps are as follows:
[0042] A. Remote signal sampling
[0043] Sampling the far-end signal from the far-end to obtain the discrete value x(n) of the far-end signal at time n, and forming the adaptive filter input vector X(n) at the current time n with the value of the previous L-1 time , X(n)=[x(n), x(n-1),...,x(n-L+1)] T , where L=512 is the number of filter taps, and T represents the transpose operation;
[0044] B. Echo estimation
[0045] The adaptive filter input vector X(n) at the current moment n is passed through the adaptive filter to obtain the output value y(n) at the current moment n, that is, the estimated value y(n) of the echo, y(n)=X T (n)w(n); Wherein, w(n) is the tap weight vector of the adaptive filter of current moment n, w(n)=[w 1(n),w 2 (n),...,w L (n)] T , the initial value of w(n) is a z...
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