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Affine-projection-like self-adaptive echo cancellation method with biased compensation

An affine projection and echo cancellation technology, applied in two-way sound reinforcement telephone system, telephone communication, electrical components and other directions, can solve problems such as large steady-state error, reduce deviation, reduce steady-state error, and improve echo cancellation effect Effect

Inactive Publication Date: 2016-11-23
SOUTHWEST JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method exhibits a large steady-state error when the adaptive filter input signal is noisy

Method used

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  • Affine-projection-like self-adaptive echo cancellation method with biased compensation
  • Affine-projection-like self-adaptive echo cancellation method with biased compensation
  • Affine-projection-like self-adaptive echo cancellation method with biased compensation

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Embodiment

[0033] A specific embodiment of the present invention is a biased compensation-like affine projection adaptive echo cancellation method, the steps of which are as follows:

[0034] A. Signal sampling

[0035] The far-end signal x(n), x(n-1),...,x(n-L+1) obtained by sampling the remote signal from the far-end at the current time n and the previous L-1 time ), constituting the adaptive filter input vector X(n) at the current moment n, X(n)=[x(n), x(n-1),...,x(n-L+1)] T , where L=32 is the number of filter taps, and T represents the transpose operation;

[0036] Near-end signals d(n),d(n-1),...,d(n-P+1 ) constitute the near-end signal vector D(n) at the current moment n, D(n)=[d(n),d(n-1),...,d(n-P+1)] T ;P is the order of affine projection, and its value ranges from 2 to 8;

[0037] B. Echo estimation

[0038] Pass the adaptive filter input vector X(n) at the current time n through the adaptive filter to obtain the output value y(n) at the current time n, that is, the estim...

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Abstract

The invention discloses an affine-projection-like self-adaptive echo cancellation method with biased compensation. The affine-projection-like self-adaptive echo cancellation method comprises the steps of: A, sampling a remote signal; B, estimating an echo, wherein a self-adaptive filter input vector X (n) at a current moment n passes through a self-adaptive filter to obtain an output value y (n) at the current moment n, namely an echo estimation value y(n) is obtained and equal to XT(n)w(n); C, cancelling the echo, wherein a near-end signal d (n) with an echo at the current moment n which is picked up by a near-end microphone and the output value y(n) at the current moment n of the self-adaptive filter are subjected to subtraction operation, and a return signal, namely a residual signal e(n), is returned to a far end and equal to d(n)-y(n); D, updating a tapping weight vector of the filter, wherein an affine-projection-like method with biased compensation is adopted to calculate the tapping weight vector w(n+1) of the self-adaptive filter at a next moment n+1 by adopting a formula shown in description; E, and assuming that n is equal to n+1, repeating the steps B, C and D until a call is ended. The method has a good cancellation effect on the acoustic echo of a communication system, and is high in convergence speed and small in steady-state error.

Description

technical field [0001] The invention relates to an affine-like projection adaptive echo cancellation method with partial compensation, and belongs to the technical field of echo cancellation for communication. Background technique [0002] When we use communication devices (mobile phones, Internet phones, and car phones, etc.), we occasionally hear our own voice at the receiving end, which is an echo phenomenon. The echo problem has existed during calls since the appearance of telephone equipment. Initially, due to technical limitations, the number of telephone equipment was limited, and the distance between different telephone equipment was often relatively close, so the echo phenomenon during voice calls was not very obvious. . However, with the development of the times, the continuous development of information technology, the advancement of production technology and the increase of transportation equipment in daily life, the scope of people's activities has increased, a...

Claims

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Application Information

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IPC IPC(8): H04M9/08
CPCH04M9/082H04M9/085
Inventor 赵海全郑宗生
Owner SOUTHWEST JIAOTONG UNIV
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