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Echo signal processing method and system as well as television

A technology of echo signal and test signal, applied in the field of electro-acoustics, it can solve the problems of difficulty in eliminating echo and taking environmental factors into consideration.

Active Publication Date: 2011-05-04
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide an echo signal canceling method, system and TV set, aiming to solve the problem that the echo processing in the prior art does not take environmental factors into consideration and it is difficult to eliminate the echo

Method used

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  • Echo signal processing method and system as well as television
  • Echo signal processing method and system as well as television
  • Echo signal processing method and system as well as television

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Embodiment 1

[0034] In the embodiment of the present invention, the echo signal of the received far-end voice signal is estimated by modifying the coefficient of the filter according to the actual environment, so that the estimated echo signal is closer to the actual environmental echo, and the echo can be effectively eliminated. The following Illustrate through specific examples.

[0035] figure 1 It shows the implementation flowchart of the echo signal processing method provided by Embodiment 1 of the present invention, and the details are as follows:

[0036] The application scenario of the embodiment of the present invention may be an electronic device terminal with a chat function, such as a chat TV, etc. figure 2 A schematic diagram of a TV chat system is shown, the chat TV system includes a user A and a user B, wherein each chat TV has an array microphone and a loudspeaker.

[0037] In step S101, change information of time delay, phase shift and amplitude of the echo signal of th...

Embodiment 2

[0047] image 3It shows the implementation flowchart of the echo signal processing method provided by Embodiment 2 of the present invention, and the details are as follows:

[0048] In step S301, when an instruction to trigger calibration of filter coefficients is received, a test signal is output.

[0049] In step S302, the echo signal formed by the test signal passing through the echo channel is acquired.

[0050] In the embodiment of the present invention, due to the difference in various environmental factors such as the size of the space and indoor equipment, the sound channel will also be different. Therefore, according to the different environmental factors, the received far-end sound signal is formed through different channels. The echo signal is not the same either.

[0051] In step S303, according to the comparison and analysis of the echo signal and the test signal, the time delay, phase shift and amplitude change information of the echo signal of the test signal ...

Embodiment 3

[0057] Figure 4 A structural diagram of the echo signal processing system provided by Embodiment 3 of the present invention is shown, and for convenience of description, only parts related to the embodiment of the present invention are shown.

[0058] The system may be a software unit, a hardware unit or a combination of software and hardware built in an electronic device terminal with a chat function, and the electronic device terminal may be a TV set.

[0059] The echo signal processing system provided by the embodiment of the present invention includes a calibration unit 41 , an adaptive filter 42 and a signal processing unit 43 .

[0060] In the embodiment of the present invention, the calibration unit 41 acquires time delay, phase shift and amplitude change information of the echo signal of the test signal.

[0061] In the embodiment of the present invention, the form of the test signal can be various, and can be selected and set according to actual needs. The signal wh...

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Abstract

The invention provides an echo signal offset method and system as well as a television, belonging to the technical field of electroacoustics. The method comprises the following steps: acquiring variation information of time delay, phase shift and amplitude of an echo signal of a test signal; correcting coefficients of a filter based on the variation information; estimating an echo signal generated by a far-end voice signal based on the corrected coefficients of the filter; and eliminating the estimated echo signal from received local voice signals, wherein the local voice signals comprise the voice signal of a local user and the echo signal locally practically generated by the far-end voice signal. Based on full consideration of influence of environment factors on echo signals, echo can be eliminated effectively.

Description

technical field [0001] The invention belongs to the technical field of electroacoustics, and in particular relates to an echo signal canceling method, system and television. Background technique [0002] Acoustic echo means that when the sound broadcast by the speaker is heard by the receiver, the voice signal is also picked up by the microphone through various channels and re-inputted to the original speaker. The echoes pass through different paths, which produce different delayed echoes, including direct echoes and indirect echoes. [0003] Direct echo means that the sound broadcast by the speaker directly enters the microphone without any reflection. This echo has the shortest delay. The pickup sensitivity of the microphone is directly related; while the indirect echo refers to the collection of echoes generated after the sound broadcast by the speaker passes through different paths and enters the microphone after one or more reflections. The movement or change of anyth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02H04N5/60G10L21/0208
Inventor 陈军
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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