Proportional affine projection echocancellation method of convex combination coefficient differences

Abstract

The invention discloses a proportional affine projection echocancellation method of convex combination coefficient differences. The method includes the following steps: A. far-end signals sampling and filtering, A1. a far-end dispersion input signal constitutes an input vector X (n) of a convex combination adaptive filtering echocancellation filter; A2. inputting a filter to the vector X (n) to obtain filtering values y1 (n) and y2 (n) of a large step length and a small step length; B. echo offsetting, subtracting a near-end signal d (n) and a combination filter output value y (n) to obtain a total residual signal e (n) after echocancellation, and transmitting the total residual signal e (n) to a far end; C. conducting convex combination, conducting convex combination on the output value y1 (n) and y2 (n) of the large step length and the small step length through a weight [lambda] to obtain a combination output value y (n), and conducting convex combination on tap weight coefficients W1 (n) and W2 (n) through the weight [lambda] to obtain a tap weight coefficient W (n) of a tap filter; D. updating a tap weight vector of a filter; E. updating the weight of the filter; F. limiting the weight of the filter; G. repeating the steps of A, B, C, D, E, F, thus realizing echocancellation. The method has strong identification capability, rapid convergence, strong tracking capability, low stability error rate, and excellent effects of echocancellation.

Description

technical field [0001] The invention belongs to the technical field of communication self-adaptive echo cancellation, in particular to the technical field of proportional affine projection echo cancellation. Background technique [0002] With the development of communication technology, more and more communication devices provide hands-free function, which makes communication more convenient, but also produces echo problems, which will seriously affect the quality of voice calls and the stability of the system. For current communication systems (including wired telephones, hands-free telephones, mobile phones and teleconferencing systems, etc.), echo cancellation is one of the key factors that need to be considered in the design of these systems. Echo cancellation is to input the far-end signal with echo into the adaptive filter to realize the system identification of the unknown echo channel, that is, through the adjustment of the adaptive filtering algorithm, the echo path...

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Problems solved by technology

However, when the algorithm increases the step size, more data is lost, resulting in a large steady-state error.

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