A Least Mean Cubic Absolute Value Echo Cancellation Method Based on Convex Combination
An echo cancellation and convex combination technology, applied in two-way sound reinforcement telephone systems, interconnection devices, advanced technologies, etc., can solve the problems of large step size, short step size, steady state imbalance, etc., and achieve a stable and stable weight change trend. The effect of small and low steady-state error
Active Publication Date: 2019-11-26
SOUTHWEST JIAOTONG UNIV
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However, because it uses a fixed step size, the initial step size is too short to converge faster, and when it converges, the step size is too large, making it difficult to accurately identify the system, resulting in steady-state imbalance
Its convergence speed and steady-state performance need to be improved
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[0052] A specific embodiment of the present invention is a method for echo cancellation of the least mean cubic absolute value of a convex combination, the steps of which are as follows:
[0053] A. Remote signal filtering
[0054] A1. Sampling the remote signal from the far end to obtain the discrete value x(n) of the remote signal at the current time n, and the discrete value x(n) of the remote signal at the current time n and the previous L-1 time ), x(n-1)..., x(n-L+1), the input vector X(n) of the current moment n constituting the filter, X(n)=[x(n),x(n -1)...,x(n-L+1)] T , where L=512 is the number of filter taps, and the superscript T represents the conjugate transpose;
[0055] A2. Pass the input vector X(n) of the current moment n through the large-step filter and the small-step filter to obtain the large-step filter value y of the current moment n respectively 1 (n),y 1 (n)=w 1 (n) T X(n) and the small-step filter value y of the current moment n 2 (n),y 2 (n)...
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A method for echo cancellation with minimum mean cubic absolute value of a convex combination, the steps of which are mainly: A, far-end signal filtering, to obtain a large-step filter value y 1 (n), and small step filter value y 2 (n); B, convex combination, the large step size filter value y 1 (n) and small step filter value y 2 (n) carry out convex combination and obtain combined filter value y (n); C, echo cancellation; D, filter tap weight coefficient update, carry out the tap weight coefficient update of size step size filter respectively based on least mean cubic absolute value algorithm; E, update the weight of the filter; F, limit the weight of the filter, G, let n=n+1, repeat the steps of A, B, C, D, E, F until the end of the call. The cost function of the update of the tap weight coefficients of the large and small filters in this method is the mean cubic absolute value of the total residual signal e(n), which amplifies the error, has high calculation accuracy, and quickly converges through the large-step filter And the small steady-state error of the small-step filter makes the steady-state error small, and at the same time, the convergence speed is fast and the echo cancellation effect is good.
Description
technical field [0001] The invention belongs to the technical field of adaptive echo cancellation for telephone communication. Background technique [0002] With the advancement of technology in recent years, communication technology has been developing day by day, and various new communications emerge in an endless stream, but the most important communication method is still voice communication, and users are more and more concerned about the quality of voice communication. Acoustic echo is the most important factor affecting the quality of voice calls. Acoustic echo in the communication process means that the user hears his own voice repeatedly during the communication process, which is divided into direct echo and indirect echo. Direct echo means that the sound from the speaker directly enters the microphone without any reflection. The delay of this echo is the shortest, which is related to the voice energy of the far-end speaker, the distance and angle between the speak...
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IPC IPC(8): H04M9/08
CPCH04M9/08H04M9/082Y02D30/70
Inventor 赵海全尹凯丽
Owner SOUTHWEST JIAOTONG UNIV