发明名称 |
Real-time speech analyzer |
摘要 |
Apparatus for the real-time analysis of speech signals in which a digital signal representative of the speech signal is adaptive threshold center-clipped and infinite peak-clipped to form a signal comprising three logic states (+1,0,-1). The autocorrelation function of this signal is determined by a circuit which employs simple combinational logic and an updown counter circuit. Pitch period and voiced-unvoiced indication are determined from the location and magnitude of the peak value of the autocorrelation function. Additionally, a signal representative of the speech energy is provided by summing the digital speech signals over a predetermined time interval and intervals of silence are detected by comparing the speech energy in an interval of time with a predetermined or adaptively determined threshold energy.
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申请公布号 |
US4015088(A) |
申请公布日期 |
1977.03.29 |
申请号 |
US19750627865 |
申请日期 |
1975.10.31 |
申请人 |
BELL TELEPHONE LABORATORIES, INCORPORATED |
发明人 |
DUBNOWSKI, JOHN JOSEPH;RABINER, LAWRENCE RICHARD;SCHAFER, RONALD WILLIAM |
分类号 |
G10L11/00;G10L11/04;(IPC1-7):G10L1/04 |
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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