Echo cancellation method and device for speech recognition process

Abstract

The invention discloses an echo cancellation method used in a voice recognition process, comprising the following steps: a microphone is used to receive the sound of a near-end user and a far-end speaker, and form a first analog signal, and the first analog signal passes through an AD converter It will be converted into a digital signal, and the digital signal will be processed by multiple echo cancellation modules such as the voice state detection module, filter control module, adaptive filter, echo cancellation module, error calibration module, residual echo interception module, and second nonlinear processing module. After that, send to the speakers. The present invention can effectively eliminate the echo collected by the microphone, thereby ensuring the accuracy of speech during speech recognition, thereby improving the accuracy of speech recognition, effectively solving the defect of eliminating noise in the digital domain in the prior art, and improving echo The quality of the cancellation enables accurate speech recognition without sound cavity for efficient isolation and without reducing the volume of the prompt tone.

Description

technical field [0001] The invention relates to the technical field of speech recognition, in particular to an echo cancellation method and device used in the speech recognition process. Background technique [0002] Speech recognition is an interdisciplinary subject. In the past two decades, speech recognition technology has made significant progress and has begun to move from the laboratory to the market. It is expected that in the next 10 years, speech recognition technology will enter industries, home appliances, communications, automotive electronics, medical, In various fields such as home services and consumer electronics, the application of speech recognition dictation machines in some fields was rated as one of the ten major events in computer development in 1997 by the American press. Speech recognition technology is one of the top ten important technological developments in the field. The fields involved in speech recognition technology include: signal processing,...

AI Technical Summary

Problems solved by technology

These echoes need to be eliminated, and then speech recognition is performed to ensure the accuracy of speech recognition. In the existing technology: one situation is to perform speech recognition in a silent environment, which sacrifices user experience; the other The first case is to isolate the sound of the microphone on the device very well. This method has high requirements on the sound insulation performance of the sound cavity material of the sound box, and it will not have a good effect on the bass. For this reason, we propose A method of echo cancellation for speech recognition process to solve the above problems

Images