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Method and system for eliminating echo

An echo and echo signal technology, applied in the field of communication, can solve the problems of limited echo cancellation effect and so on

Active Publication Date: 2016-04-20
SHENZHEN TCL DIGITAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the unevenness of the frequency response of the speaker itself, the orientation, and the reflection and diffraction of the room and various objects, the echo signal picked up by the microphone is quite different from the sound signal taken from the driving speaker (the attenuation or superposition of each frequency band different degrees, reflected as further changes in the frequency response), so this echo cancellation effect is relatively limited

Method used

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  • Method and system for eliminating echo

Examples

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no. 1 example

[0085] Based on the first embodiment of the method for eliminating echo in the present invention, step S20 includes:

[0086] Step S21, calculating the amplitude of the mixed signal and the reference signal;

[0087] Step S22, obtaining the gain coefficient of the reference signal according to the amplitude of the mixed signal and the reference signal;

[0088] Step S23, multiplying the amplitude of the reference signal by the gain coefficient, so as to obtain a gain signal of the reference signal.

[0089] In this implementation, in order to reduce the redundancy of circuit settings on the TV, the reference signal is processed by software, and when the mixed signal and the reference signal are obtained, the calculation is performed according to the mixed signal and the reference signal, Obtain the amplitudes of the mixed signal and the reference signal respectively, and then obtain the gain coefficient of the reference signal according to the amplitudes of the mixed signal a...

no. 2 example

[0091] Based on the second embodiment of the method for eliminating echo in the present invention, step S21 includes:

[0092] Step S211, sampling the mixed signal and the reference signal a preset number of times within a preset time to obtain a preset number of sampling signals respectively;

[0093] In order to improve the similarity between the obtained gain signal and the echo emitted by the loudspeaker in the mixed signal, the present invention divides the obtained mixed signal into multi-segment signals, and divides each preset time into one segment, and within the preset time The mixed signal and the reference signal are sampled a preset number of times, for example, when the time is T=0.2S, that is, the acquisition cycle T=0.2S, and the mixed signal and the reference signal are sampled in each cycle If the sampling rate is 48khz, the number of sampling signals to obtain the mixed signal and the reference signal respectively is 48khz*0.2=9600.

[0094] In a specific i...

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Abstract

The invention discloses a method for eliminating echo. The method comprises the steps of acquiring a mixed signal mixed by a user sound given out by a user and echo given out by a loudspeaker, acquiring a sound signal given out by the loudspeaker according to the volume of the sound given out by the loudspeaker, and using the sound signal as a reference signal; comparing the mixed signal with the reference signal, so as to obtain a gain coefficient of the reference signal, and acquiring a gain signal of the reference signal according to the gain coefficient; acquiring a compensation signal of the reference signal according to the gain signal and a corresponding preset compensation coefficient; reversing phase of the compensation signal; and combining the compensation signal with the phase reversed with the mixed signal, so as to eliminate the echo given out by the loudspeaker. The invention also discloses a system for eliminating echo. Through adoption of the method and system for eliminating echo, the effect of eliminating echo in the mixed signal can be improved.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method and system for eliminating echo. Background technique [0002] In speech recognition systems, especially in long-distance speech recognition systems, such as speech recognition on TV, because the microphone installed on the TV is closer to the speaker of the TV itself, that is, the distance between the microphone and the speaker is shorter than the distance between the microphone and the human mouth. The distance is short, and the sound of the program from the speaker is generally louder than the voice of people talking, so the sound of the TV itself received by the microphone will be louder than the sound from the human mouth, that is, for the microphone, the sound of the TV (Echo signal) will seriously interfere with the voice of people speaking and seriously affect the system's recognition of human voice. [0003] Traditionally, the audio signal output ...

Claims

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Application Information

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IPC IPC(8): H04R3/02
CPCH04R3/02H04M9/082G10L21/0232G10L21/0356G10L2021/02082
Inventor 高伟标朱生林
Owner SHENZHEN TCL DIGITAL TECH CO LTD
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