发明名称 |
Speech activity detector for use in noise reduction system, and methods therefor |
摘要 |
A system and method for removing noise from a signal containing speech (or a related, information carrying signal) and noise. A speech or voice activity detector (VAD) is provided for detecting whether speech signals are present in individual time frames of an input signal. The VAD comprises a speech detector that receives as input the input signal and examines the input signal in order to generate a plurality of statistics that represent characteristics indicative of the presence or absence of speech in a time frame of the input signal, and generates an output based on the plurality of statistics representing a likelihood of speech presence in a current time frame; and a state machine coupled to the speech detector and having a plurality of states. The state machine receives as input the output of the speech detector and transitions between the plurality of states based on a state at a previous time frame and the output of the speech detector for the current time frame. The state machine generates as output a speech activity status signal based on the state of the state machine, which provides a measure of the likelihood of speech being present during the current time frame. The VAD may be used in a noise reduction system.
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申请公布号 |
US6453285(B1) |
申请公布日期 |
2002.09.17 |
申请号 |
US19990371748 |
申请日期 |
1999.08.10 |
申请人 |
POLYCOM, INC. |
发明人 |
ANDERSON DAVID V.;MCGRATH STEPHEN;TRUONG KWAN |
分类号 |
G10L11/02;G10L21/02;(IPC1-7):G10L11/02 |
主分类号 |
G10L11/02 |
代理机构 |
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代理人 |
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