Echo cancellation method and device

Abstract

The embodiment of the invention provides an echo cancellation method and device. The method comprises the steps of: carrying out the sub-band decomposition of an audio signal from a microphone according to a first preset decomposition rule, so as to obtain N paths of sub-band audio signals, performing adaptive echo cancellation processing on the N paths of sub-band audio signals through N adaptiveecho cancellation filters to obtain N paths of filtered sub-band audio signals, one adaptive echo cancellation filter processing one path of sub-band audio signal, and synthesizing the N paths of filtered sub-band audio signals into an audio signal subjected to adaptive echo cancellation processing according to a predetermined merging rule. According to the embodiment of the invention, the data sampling rate is reduced in a manner of performing sub-band decomposition on the audio signal input into the microphone, so that the echo cancellation complexity of each path of audio signal in a multi-path echo cancellation algorithm is reduced, and the system power consumption is reduced.

Description

technical field [0001] The invention relates to the field of noise reduction processing, in particular to an echo cancellation method and device. Background technique [0002] In order to reduce the complexity of the algorithm, the existing smart earphones generally isolate the speaker and the microphone so that the echo received by the microphone is as small as possible. In addition, the volume of the speaker is lowered to further reduce the echo. The method by which a speaker maximizes its playback sound pressure level can affect the user experience. Some smart headphones do not limit the volume of the speaker, but when the echo is large, the user command cannot be recognized by the local recognition library. In addition, for a good noise reduction experience, the three-microphone or two-microphone noise reduction solution will significantly improve the recognition rate in a noisy environment, but this also means that multi-channel echo cancellation will be required, the ...

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Problems solved by technology

[0003] In view of this, the embodiment of the present invention proposes an echo cancellation method and device to solve the following problems in the prior art: in the three-microphone or two-microphone noise reduction scheme, the complexity of the multi-channel echo cancellation algorithm is relatively high, and the system operation The load is increased, the power consumption is increased, and the use time of the headset after one charge is reduced

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