发明名称 |
LOG-LIKELIHOOD RATIO METHOD FOR DETECTING VOICE ACTIVITY AND APPARATUS |
摘要 |
Method and apparatus detect voice activity (116) for spectrum or power efficiency purposes (102, 104). The method determines and tracks the instant, minimum and maximum power levels of the input signal (108). The method selects a first range of signals to be considered as noise (112), and a second range of signals to be considered as voice (111). The method uses the selected voice, noise and power levels to calculate a log likelihood ratio (LLR) (113). The method uses the LLR to determine a threshold (114), then uses the threshold for differentiating between noise and voice (116). |
申请公布号 |
WO2004075167(A3) |
申请公布日期 |
2004.11.25 |
申请号 |
WO2004US04490 |
申请日期 |
2004.02.17 |
申请人 |
CATENA NETWORKS, INC.;ZHANG, SONG;VERREAULT, ERIC |
发明人 |
ZHANG, SONG;VERREAULT, ERIC |
分类号 |
G10L25/78;G10L25/84 |
主分类号 |
G10L25/78 |
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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