发明名称 |
METHOD AND APPARATUS FOR SPEECH DETECTION USING TIME-FREQUENCY VARIANCE |
摘要 |
Speech presence is detected by first bandpass filtering (141, 143, 145) the speech to split it into banks of sub-bands. A matrix of shift registers (150) store each sub-band of speech. A power determining circuit (259) then determines individual power measurements of the speech stored in each shift register element. A variance combining circuit (160) combines the individual power measurements to provide a variance for the individual shift registers. A comparitor circuit (170) finally compares the variance with at least one threshold to indicate whether speech is detected.
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申请公布号 |
WO03065352(A1) |
申请公布日期 |
2003.08.07 |
申请号 |
WO2002US40533 |
申请日期 |
2002.12.18 |
申请人 |
MOTOROLA INC. A CORPORATION OF THE STATE OF DELAWARE |
发明人 |
MA, CHANGXUE;RANDOLPH, MARK |
分类号 |
G10L11/02;(IPC1-7):G10L15/20;G10L15/08 |
主分类号 |
G10L11/02 |
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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