A Robust Convex Combination Adaptive Telephone Echo Cancellation Method

A technology of echo cancellation and convex combination, which is applied in the field of adaptive echo cancellation and can solve problems such as convergence performance degradation

Inactive Publication Date: 2016-03-02
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This situation is equivalent to that the microphone receives a lot of noise (all sounds except the echo are regarded as noise here), and the existing proportional adaptive filtering algorithm is very sensitive to the change of the noise. In the case of , the convergence performance of the existing proportional adaptive filtering algorithm drops sharply

Method used

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  • A Robust Convex Combination Adaptive Telephone Echo Cancellation Method
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  • A Robust Convex Combination Adaptive Telephone Echo Cancellation Method

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Embodiment

[0052] A kind of specific embodiment of the present invention is, a kind of robust convex combination adaptive telephone echo cancellation method, its steps are as follows:

[0053] A. Remote signal filtering

[0054] Sampling the remote signal from the far end to obtain the remote signal discrete value x(n) at the current time n, the value of the remote signal discrete value x(n) at the time n to n-L+1 constitutes the current time n Filter input vector X(n), X(n)=[x(n),...,x(n-L+1)] T , where L=512 is the number of filter taps, and T represents the transpose;

[0055] The filter input vector X(n) gets a fast output y through a fast adaptive filter 1 (n), The filter input vector X(n) is passed through a low-error adaptive filter to obtain a low-error output y 2 (n), Among them, w 1 (n) and w 2 (n) are respectively the tap weight vectors of the fast adaptive filter and the low-error adaptive filter at time n, the length of which is L, the initial value is zero, and the...

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Abstract

The invention provides a robust convex combination type adaptive phone echo canceling method. The method comprises the main steps of A, filtering a far-end signal to obtain quick adaptive filter output y1(n) and low-error filter output y2(n); B, convex combination, namely, performing convex combination for the outputs of the two filters to obtain output y(n) of convex combination filters; c, canceling echo, namely, receiving a near-end signal d(n) with echo by a near-end microphone, subtracting y(n) and then transmitting to a far end as an echo-canceled near-end signal e(n); D, updating tap weight coefficients of the filters; E, updating the weights of the filter, and updating the hybrid parameter a (n) through a formula with sign functions; F, limiting the weight of the filters; G, enabling n to be n+1, and repeating A, B, C, D, E and F until the call is ended. The method is high in convergence rate, low in steady-state error, high in interference resistance, good in echo canceling effect, and maintains good working state under the condition of double-talk of a phone.

Description

technical field [0001] The invention belongs to the technical field of adaptive echo cancellation for telephone communication. Background technique [0002] With the development of information technology, voice communication develops in the direction of multiple services and multiple methods. In various telephone communication services, whenever a microphone and a loudspeaker are required to be used at the same time, acoustic echo is unavoidable. Acoustic echo is the most important factor affecting the quality of voice calls. During the communication process, the voice of the far-end speaker is played through the near-end speaker, and is received by the near-end microphone directly (without any reflection) or indirectly (after one or more reflections from the house or objects in the house), and transmitted back to the far-end speaker. end, so that the far-end talker hears his own voice, which is the acoustic echo. The sound propagation path from the speaker to the microph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
Inventor 赵海全喻翌夏可智
Owner SOUTHWEST JIAOTONG UNIV
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