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Adaptive Echo Cancellation Method for Speech Communication Based on S-Type Function

An echo cancellation and voice communication technology, applied in speech analysis, instruments, etc., can solve the problems of filter error update, steady-state error increase, large error signal, etc., to achieve low steady-state error, fast convergence speed, impact resistance powerful effect

Active Publication Date: 2022-03-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

When there is impact noise, the "error signal" is huge, and the tap weight vector of the filter will produce a huge update of the error, resulting in an increase in steady-state error and slow convergence

Method used

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  • Adaptive Echo Cancellation Method for Speech Communication Based on S-Type Function
  • Adaptive Echo Cancellation Method for Speech Communication Based on S-Type Function
  • Adaptive Echo Cancellation Method for Speech Communication Based on S-Type Function

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Embodiment

[0035] A kind of specific embodiment of the present invention is, a kind of voice communication adaptive echo cancellation method based on S-type function, its steps are as follows:

[0036] A. Echo cancellation

[0037] A1. Remote signal acquisition

[0038] Sampling the signal from the remote end to obtain the discrete value x(n) of the remote input signal at the current time n; the input signal x(n) and x(n- 1),...,x(n-L+1), forming the adaptive filter input vector X(n) at the current moment n, X(n)=[x(n),x(n-1), ...,x(n-L+1)] T ; Wherein, L=512, represents the number of taps of the filter, and T represents the transpose operation;

[0039] A2. Echo signal estimation

[0040] Pass the input signal vector X(n) at the current moment n through the adaptive filter to obtain the output value of the adaptive filter, that is, the estimated value y(n) of the echo signal,

[0041] y(n)=X T (n)W(n)

[0042] Wherein W(n) is the tap weight vector of the adaptive filter of curren...

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Abstract

A voice communication adaptive echo cancellation method based on S-type function, its main steps are: A, echo cancellation B, tap weight vector update: B1, calculate S-type function value, by error signal e (n) and tap weight vector W(n), the calculated S-type function value s(n), B2, the update of the filter tap weight vector, will s(n)‑s 2 (n) Introduce the subtraction term of the adjustment item into the weight vector update formula to obtain the filter tap weight vector W(n+1) at the next moment n+1; C, repeat. The method has fast convergence speed, low steady-state error, strong impact resistance and good echo cancellation effect.

Description

technical field [0001] The invention relates to an adaptive echo cancellation method in voice communication. [0002] technical background [0003] During a call (voice communication), the sound signal will be reflected back to the signal source after being delayed or deformed to form an echo, and the echo phenomenon will seriously affect the quality of the voice call. For example, when making a phone call, because the speaker and microphone are placed in the same space, the local near-end microphone will receive the far-end voice from the local speaker and transmit it back to the far end, which will cause the far-end speaker to hear himself The sound will degrade the quality of the call. This phenomenon widely exists in voice communication systems such as satellite communication, hands-free phone, and conference call system. It is necessary to take effective measures to suppress the echo signal, eliminate its influence and improve the quality of voice communication. Adapt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0208G10L21/0216
CPCG10L21/0208G10L21/0216
Inventor 赵海全李磊
Owner SOUTHWEST JIAOTONG UNIV
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