发明名称 |
APARELHO DETECTOR DA ACTIVIDADE VOCAL E APARELHO TELEFONICO MOVEL QUE O CONTEM |
摘要 |
The first aspect provides a voice activity detection appts. for receiving an input signal, estimating the noise signal component of the input signal and continually forming a measure M of the spectral similarity between a portion of the input signal and the noise signal. A circuit is provided to compare a parameter derived from the measure M with a threshold value T to produce an output to indicate the presence, or absence, of speech depending on whether, or not, that value is exceeded. A second aspect covers voice activity detection appts. which continually forms a spectral distortion measure and carries out a comparison. |
申请公布号 |
PT89978(B) |
申请公布日期 |
1995.03.01 |
申请号 |
PT19890089978 |
申请日期 |
1989.03.10 |
申请人 |
BRITISH TELECOMMUNICATIONS |
发明人 |
DANIEL KENNETW FREEMAN;IVAN BOYD |
分类号 |
G10L11/00;G10L11/02;G10L15/04;G10L25/00;G10L25/78;(IPC1-7):G01L3/00 |
主分类号 |
G10L11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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