Echo elimination device for microphone and method thereof

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. Such as figure 1 As shown, 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, passes through the acoustic circuit g between the speaker and the microphone, and is collected by the microphone as a reference signal d, and then passes through The communication link is passed back to the remote end. 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 ...

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Problems solved by technology

[0053] 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 every time a frame signal with a frame length of M is passed, so the convergence speed is slow, especially when the feedback loop characteristic The effect is not ideal when the change is fast

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