Echo elimination device for microphone and method thereof

An echo cancellation, microphone technology, applied in transducer acoustic response prevention, speech analysis, impedance network, etc., can solve problems such as slow convergence speed and unsatisfactory effect.

Inactive Publication Date: 2007-04-25
VIMICRO CORP
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  • Claims
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Problems solved by technology

[0050] It can be seen from the steps of the above-mentioned frequency-domain adaptive filtering algorithm that the filter coefficients of the frequency-domain adaptive filter are updated eve

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  • Echo elimination device for microphone and method thereof
  • Echo elimination device for microphone and method thereof
  • Echo elimination device for microphone and method thereof

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Embodiment Construction

[0159] The echo canceling device and method of the present invention will be described in detail below with reference to the accompanying drawings.

[0160] In order to effectively track the feedback loop of the adaptive filter, its coefficient length must be greater than the number of sampling points of the feedback delay. For example, for a signal with a sampling rate of 8K, if the time-domain adaptive filter coefficient length M=1024, then the maximum feedback delay of the feedback loop that the filter can track and simulate is: 1024 / 8000=128ms.

[0161] In the frequency domain adaptive filtering method described in the background art, the length of the frequency domain filter coefficient is 2M, the length of the corresponding time domain coefficient is M, and the length of each new data frame is also M. That is to say, the length of the time-domain coefficient of the adaptive filter is the same as the length of the new data frame, that is, the length of the coefficient of ...

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Abstract

This invention discloses a microphone echo elimination device and method, which eliminates echo between microphone and sound circuit, wherein, the device comprises long frame adjust module to combine one self adaptive filter parameter data frame for self adapting filter.

Description

technical field [0001] The invention relates to the field of echo cancellation, in particular to a microphone echo cancellation device and method using a frequency-domain adaptive filter, which are used to cancel the echo generated by an acoustic loop between a loudspeaker and a microphone. Background technique [0002] The echo is caused by the acoustic loop between the speaker and the microphone. As shown in Figure 1, the sound signal from the far end, through the communication connection, arrives at the near end and is recorded as signal u, which is emitted through the near end speaker, and is collected by the microphone as the reference signal d after passing through the acoustic circuit g between the speaker and the microphone. , and then sent back to the remote end through the communication connection. At this time, the far-end speaker can hear his own echo, that is, the far-end echo. This will seriously affect the call quality. [0003] Since the acoustic loop g fr...

Claims

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Application Information

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IPC IPC(8): G10L21/02H04R3/02H03H21/00G10L21/0208
Inventor 张晨
Owner VIMICRO CORP
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