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Double-end call robust variable-order variable-step-size affine projection method

A technology of affine projection and double-terminal communication, applied in the field of affine projection, can solve the problems of poor robustness and achieve good performance and strong robustness

Active Publication Date: 2017-02-22
张家口一言一行科技有限公司
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0030] Although the algorithm has certain robustness to near-end signals, as the order of affine projection increases, the convergence speed of the method will increase, but the robustness will deteriorate

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  • Double-end call robust variable-order variable-step-size affine projection method
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  • Double-end call robust variable-order variable-step-size affine projection method

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Embodiment Construction

[0066] A double-talk robust variable-level variable-step-size affine projection method of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0067] The double-talk robust variable-step variable-step-length affine projection method of the present invention mainly solves the problem of the divergence of the filter affected by the double-talk in acoustic echo cancellation. The invention adjusts the order of affine projection adaptively from the amount of information through the defined step size, so that it can maintain a smaller order of affine projection during double-talking and obtain better robustness. In the convergence, use a larger affine projection order to obtain a faster convergence speed.

[0068] A double-ended call robust variable step variable step size affine projection method of the present invention comprises the following steps:

[0069] 1) Initialize the parameters of the filter:

[0070...

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Abstract

The invention discloses a double-end call robust variable-order variable-step-size affine projection method, and the method comprises the steps: initializing the parameters of a filter; updating an input signal and a microphone signal; calculating prior information; carrying out the microphone signal power estimation, echo signal power estimation and error signal power estimation currently; calculating a step size; carrying out the calculation of step size information and related calculation; determining an affine projection order number; and updating a filter coefficient. The method is used for an acoustic echo eliminator, and can enable the acoustic echo eliminator to select a smaller affine projection order number during the double-end call, and to select a bigger affine projection order number during convergence. Therefore, the method provided by the invention can effectively solve a problem of conflict between the convergence rate and the double-end call robustness, and obtains the better performance. The method is higher in robustness, and does not reduce the other performances.

Description

technical field [0001] The invention relates to an affine projection method. In particular, it relates to a double-talk robust variable-order variable-step-size affine projection method for adaptive filtering of the double-talk problem in acoustic echo cancellation. Background technique [0002] Acoustic echo mainly refers to the echo formed by the sound emitted from the speaker being re-picked up by the microphone and then sent to the far end again. Acoustic Echo Cancellation (AEC) is widely used in various embedded devices and various VoIP applications, including various telecommunication network equipment and terminal equipment, rich software video conferencing and VoIP softphone, etc. A general acoustic echo canceller includes at least two parts: a double talk detector (Double Talk Detector, DTD) and a linear echo canceller. figure 1 Is a typical acoustic echo canceller. The signal received by the microphone at time n is: [0003] d(n)=y(n)+v(n)+w(n) 1.1 [0004] In...

Claims

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Application Information

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IPC IPC(8): G10L21/0208
Inventor 张涛焦海泉任相赢安鑫祺
Owner 张家口一言一行科技有限公司