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Method for self-adaptively adjusting background noise in voice endpoint detection

An adaptive adjustment and background noise technology, applied in speech analysis, speech recognition, instruments, etc., to achieve high detection efficiency and good quality

Inactive Publication Date: 2010-01-13
CHINA DIGITAL VIDEO BEIJING
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Problems solved by technology

[0008] The purpose of the present invention is to provide a background noise self-adaptive adjustment method in the speech endpoint detection in view of the characteristics of the automatic subtitle generation system and the defects of the existing speech endpoint detection method. Voice for speech endpoint detection, thereby improving the efficiency of speech endpoint detection in complex noise backgrounds

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  • Method for self-adaptively adjusting background noise in voice endpoint detection
  • Method for self-adaptively adjusting background noise in voice endpoint detection
  • Method for self-adaptively adjusting background noise in voice endpoint detection

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The background noise adaptive adjustment method in speech endpoint detection provided by the present invention can timely adjust speech parameters according to changes in background noise, thereby improving speech endpoint detection efficiency under complex noise backgrounds. The overall process of voice endpoint detection is as follows: figure 1As shown, after the audio data is input, the audio file is parsed and the digital sample value is extracted, and the obtained audio sample sequence is band-pass filtered with a bandwidth of 400hz~3500hz. The main purpose is to filter noise or music outside the frequency band of human pronunciation. In addition, it can greatly reduce the influence of background music on voice endpoint detection. Subsequently, window processing is performed on the audio sample sequence, and it is divided into fr...

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Abstract

The invention relates to voice detection technology in an automatic caption generating system, in particular to a method for self-adaptively adjusting background noise in voice endpoint detection. The method can re-determine a short-time energy frequency value of each frame to acquire a new short-time energy frequency value sequence by recalculating short-time energy Eb, short-time zero-crossing rate Zb and short-time information entropy Hb of the background noise according to the real-time change of the background noise; therefore, the method can carry out endpoint detection for the continuous voice under a complex background noise environment so as to improve the voice endpoint detection efficiency under the complex noise background.

Description

technical field [0001] The invention relates to a speech detection technology in an automatic subtitle generation system, in particular to a background noise self-adaptive adjustment method in speech endpoint detection. Background technique [0002] Speech endpoint detection technology is a new field of speech technology research, which is applied in automatic subtitle generation system. The current subtitle production method first needs to prepare a subtitle manuscript. This subtitle manuscript refers to a text file written in advance before making a TV program, which records the title of the program, what the host wants to say, and what the interviewee said. words and other content. When making TV programs, editors add audio and video materials to the storyboard of non-linear editing software, and then edit them according to the gist of the program. Editing operations generally include modifying the position of the material, adding some special effects, adding subtitles,...

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Application Information

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IPC IPC(8): G10L11/00G10L11/02G10L15/04
Inventor 李祺马华东郑侃彦韩忠涛张婷
Owner CHINA DIGITAL VIDEO BEIJING
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