VOICE ACTIVITY DETECTION
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专利名称：VOICE ACTIVITY DETECTION
发明人：FREEMAN, Daniel, Kenneth,BOYD, Ivan 申请号：GB1989000247
申请日：19890310
公开号：WO89/008910P1
公开日：
19890921
专利内容由知识产权出版社提供
摘要：Voice activity detector (VAD) for use in an LPC coder in a mobile radio system, uses autocorrelation coefficients R0, R1... of the input signal, weighted and combined, to provide a measure M which depends on the power within that part of the spectrum containing no noise, which is thresholded against a variable threshold to provide a speech/no speech logic output. The measure is formula (I), where Hi are the autocorrelation coefficients of the impulse response of an Nth order FIR inverse noise filter derived from LPC analysis of previous non-speech signal frames. Threshold adaption and coefficient update are controlled by a second VAD responsive to rate of spectral change between frames.
申请人：FREEMAN, Daniel, Kenneth,BOYD, Ivan
地址：GB,GB,GB
国籍：GB,GB,GB
代理机构：LLOYD, Barry, George, William
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