Echo cancellation method and device for speech recognition process

Abstract

The invention discloses an echo cancellation method and device for the speech recognition process. The method comprises steps that a microphone is used for receiving the sound of a near-end user and the sound of a far-end loudspeaker and forming a first simulation signal, the first simulation signal is converted into a digital signal through an AD converter, and the digital signal is subjected toecho cancellation through a voice state detection module, a filtering control module, a self-adaptive filter, an echo cancellation module, an error calibration module, a residual echo intercept moduleand a second nonlinear processing module and then is sent to the loudspeaker. The method is advantaged in that the echo collected by the microphone can be effectively eliminated, accuracy of speech recognition can be guaranteed, speech identification precision is improved, the defects of digital domain noise cancellation in the prior art can be effectively solved, echo cancellation quality is improved, and accurate speech recognition is performed under the condition of having no effective isolation of a speech cavity and having no reduction of the volume of the prompt speech.

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

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