Affine projection symbol echo cancellation method based on orthogonal transformation

A technology of affine projection and echo cancellation, which is applied in speech analysis, instruments, etc., can solve problems such as unsatisfactory convergence speed and steady-state error, and achieve the effects of good echo cancellation effect, simplified update calculation, and fast convergence speed

Active Publication Date: 2016-07-20
杭州东南吉通网络有限公司
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Problems solved by technology

However, the APSA algorithm does not have a strong decorrelation capability like the APA algorithm
Therefore, in speech echo cancellation, the convergence speed and steady-state error of the APSA algorithm are not ideal, even though it has good robustness to double-talk situations

Method used

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  • Affine projection symbol echo cancellation method based on orthogonal transformation
  • Affine projection symbol echo cancellation method based on orthogonal transformation
  • Affine projection symbol echo cancellation method based on orthogonal transformation

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Embodiment

[0032] A kind of specific embodiment of the present invention is, a kind of affine projection symbolic echo cancellation method based on orthogonal transformation, its steps are as follows:

[0033] A. Get the signal

[0034] Sampling the voice signal from the far end to obtain the discrete value x(n) of the far-end signal at the current moment n; at the same time, sampling the echo signal collected by the near-end microphone to obtain the desired signal d(n) at the current moment n;

[0035] B. Calculate the output y(n) of the adaptive filter

[0036] The current moment n and the L remote signal discrete values ​​x(n), x(n-1)...,x(n-L+1) of the previous L-1 moments constitute the self-adaptation of the current moment n Filter input vector x(n), x(n)=[x(n),x(n-1)...,x(n-L+1)] T , where L represents the number of taps of the adaptive filter, L=512 or 1024, and the superscript T represents the transpose;

[0037] Calculate the output signal y(n) of the adaptive filter at the ...

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Abstract

The present invention discloses an affine projection symbol echo cancellation method based on orthogonal transformation. The method mainly comprises the steps of A acquiring a voice signal x(n) transmitted from a far-end and a desired signal d(n) collected by a near-end microphone; B calculating the output y(n) of an adaptive filter; C carrying out the echo cancellation, namely, taking an error signal e(n) obtained by subtracting y(n) from d(n) as a clean signal after the echo cancellation to transmit to the far-end; D orthogonally transforming an input matrix X(n) of the adaptive filter into a decorrelation matrix U(n); E updating a tap weight vector of the adaptive filter; F defining n=n+1, and repeating the steps of A, B, C, D and E until the conversation is ended. The method has the advantages of fast convergence speed and low steady-state error except having the good robustness for the doubletalk.

Description

technical field [0001] The invention belongs to the technical field of adaptive echo cancellation for voice communication. Background technique [0002] Acoustic echoes are unavoidable wherever a microphone and speaker are used simultaneously during voice communication. The voice of the far-end speaker is played through the near-end speaker, directly or indirectly received by the near-end microphone, and transmitted back to the far end, so that the far-end speaker can hear his own voice. This is the acoustic echo. The propagation path of sound from the speaker to the microphone is called the echo path, and its impulse response vector is expressed as w o . Acoustic echo is the most important factor affecting the quality of voice calls. Therefore, how to take an effective method to eliminate the echo and improve the quality of voice communication is one of the very hot topics in the field of signal processing. Although researchers have proposed different types of echo canc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L19/02
CPCG10L19/0212G10L21/0208G10L2021/02082
Inventor 赵海全喻翌
Owner 杭州东南吉通网络有限公司
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