1975-10-31
1977-03-29
Claffy, Kathleen H.
G10L 104
Patent
active
040150887
ABSTRACT:
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.
REFERENCES:
patent: 2908761 (1959-10-01), Raisbeck
patent: 3381091 (1968-04-01), Sondhi
patent: 3405237 (1968-10-01), David
patent: 3626168 (1971-12-01), Norsworthy
Dubnowski John Joseph
Rabiner Lawrence Richard
Schafer Ronald William
Bell Telephone Laboratories Incorporated
Claffy Kathleen H.
Cubert J. S.
Kemeny E. S.
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