Frequency-domain echo cancellation method for speech recognition front end and computer storage medium

A technology of echo cancellation and speech recognition, which is applied in speech recognition, speech analysis, instruments, etc., and can solve problems such as slow convergence speed and large amount of computation

Pending Publication Date: 2019-05-07
NIO CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, the problem of using the multi-channel echo cancellation method to deal with the car music echo mainly has the disadvantages of large amount of calculation and slow convergence speed.

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  • Frequency-domain echo cancellation method for speech recognition front end and computer storage medium
  • Frequency-domain echo cancellation method for speech recognition front end and computer storage medium
  • Frequency-domain echo cancellation method for speech recognition front end and computer storage medium

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Embodiment Construction

[0105] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0106] Glossary:

[0107] NLMS (normalized least mean square): The normalized least mean square error method is used to estimate the unknown system transfer function to obtain the smallest mean square error between the estimated system signal output signal and the real output signal.

[0108] Adaptive filter: A filter that the system can continuously update and change adaptively with the system output or output data. If ...

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Abstract

The invention relates to an echo cancellation method and system for a speech recognition front end. The echo cancellation method mainly comprises the steps of time-frequency domain signal transformation, echo signal and residual signal estimation, sub-band signal power spectrum and cross correlation coefficient calculation, nonlinear processing based on a gain function of cross correlation coefficients, frequency-time domain transformation and the like to finally output signals without echoes. The single-channel echo cancellation method is adopted for processing frequency-domain echoes under avehicle-mounted condition or in other application scenes, and has the advantages of small calculation amount and high convergence speed.

Description

technical field [0001] The invention relates to the field of unmanned aerial vehicles in the field of voice signal preprocessing in the field of artificial intelligence, and in particular to a frequency-domain echo cancellation method for a front-end of voice recognition, a computer storage medium and electronic equipment. Background technique [0002] Acoustic echo (acoustic echo) refers to the phenomenon that the speaker's voice returns and is heard again in a scene such as a voice call or voice playback. The sound of the speaker used by the speaker is input again through the microphone to generate an acoustic echo, and the acoustic echo becomes a main cause of sound quality degradation during voice calls, playback, or multi-party audio conferences. Therefore, most voice call, playback or voice conferencing solutions use an acoustic echo canceller (AEC: Acoustic Echo Canceller). [0003] Since there are often multiple speakers in vehicle application scenarios, a multi-cha...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L21/0232G10L15/22
Inventor 胡奎
Owner NIO CO LTD
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