An echo cancellation system and method thereof

An echo cancellation and echo technology, applied in the audio field, can solve problems such as unsatisfactory echo cancellation effect, increased difficulty of call process status and response speed, etc., to achieve the effect of quickly adapting to changes in the environment, removing echo, and improving response speed

Active Publication Date: 2021-10-08
上海推乐信息技术服务有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

However, the complex and changeable acoustic environment and the uncertainty of the state of the call process increase the difficulty and response speed of the adaptive filter AF to learn the echo path h(n), and the effect of echo cancellation is not ideal

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  • An echo cancellation system and method thereof
  • An echo cancellation system and method thereof
  • An echo cancellation system and method thereof

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] In the following detailed description, reference is made to the accompanying drawings which are included in the specification and which illustrate specific embodiments of the application and which are included in this application. In the drawings, like reference numerals describe substantially similar components in different views. Va...

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Abstract

The present invention relates to an echo cancellation system and method thereof, the system includes a main filter module, a secondary filter module, a state module and an update module, wherein the main filter module includes a main filter and a main subtractor, and the main filter configured to filter the far-end signal x(n) based on a main filter filter parameter, the main subtractor subtracts the echo estimation signal output by the main filter and the near-end signal d(n) to obtain the main subtractor error signal e 1 (n); the secondary filter module is configured to provide a secondary filter echo path parameter h by performing adaptive filtering on the far-end signal x(n). 2 The state module receives the far-end signal x(n) and the near-end signal d(n), configured to determine the state of the far-end signal x(n) input to the main filter module; the update module is configured to at least Main filter filtering parameters are updated based in part on the state of the remote signal x(n) input to the main filtering module. The invention can effectively eliminate the echo, and improves the response speed of the echo elimination.

Description

technical field [0001] The invention relates to the field of audio technology, in particular to an echo cancellation system and method thereof. Background technique [0002] During voice calls, echo cancellation is an important aspect of signal processing. figure 1 It is a schematic diagram of a typical echo cancellation principle. The far end (far end) voice signal x(n) is played by the loudspeaker and propagates in the near end (near end) acoustic environment, and is collected by the near end microphone to form an echo signal y(n), and the microphone also collects the near end Speech and noise signal v(n) that may exist at the terminal (for convenience of description, hereinafter referred to as speech signal v(n)). Thus, the near-end microphone signal d(n)=y(n)+v(n). The process from the far-end signal x(n) to the echo signal y(n) can be modeled as: y(n)=h(n)*x(n), where * means convolution, h(n) means by The system parameter composed of the physical acoustic character...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02H04M9/08
CPCH04M9/08H04M9/082
Inventor 许乾坤顾凡
Owner 上海推乐信息技术服务有限公司
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