Patent
1975-03-10
1977-06-28
Cooper, William C.
179 1SC, 179 1SD, G10L 100
Patent
active
040327108
ABSTRACT:
The present invention pertains to an apparatus which receives acoustic input, the input including words spoken in isolation, finds the word boundary instants at which a word begins and ends, and performs recognition functions on the words. A feature of the invention is the compensation for breath noise after the true end of a word, using a variable backup of the estimated word end. The apparatus includes means for generating feature signals indicative of feature characteristics in the received input and further includes means for comparing the feature signals which occurred during determined time boundaries with stored features corresponding to words in a vocabulary. The invention is directed to an improved system for detecting word boundaries which includes a means responsive to the input for generating a first feature signal indicative of the substantially continuing presence of speech-like sounds which meet a first selection criterion. Means are provided for storing the feature signals which occur during the presence of this first feature signal. Further means, responsive to the input, are provided for generating a second feature signal indicative of the presence of speech-like sounds which meet a second selection criterion, this second selection criterion being more restrictive than the first selection criterion. Means are also provided for determining the last occurrence of the second feature signal among the stored feature signals. The end boundary of an input spoken word is determined as a function of this last occurrence.
REFERENCES:
patent: 3225141 (1965-12-01), Dersch
patent: 3265814 (1966-08-01), Maeda
patent: 3588363 (1971-06-01), Herscher
patent: 3592969 (1971-07-01), Yoshino
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patent: 3755627 (1973-08-01), Berkowitz
patent: 3883850 (1975-05-01), Martin
Clapper, G. L. "Interlocks for Connected Word Recognition System," IBM Tech. Disclosure Bulletin, Aug. 1970.
Cox Robert B.
Herscher Marvin B.
Martin Thomas B.
Cooper William C.
Kemeny E. S.
Novack Martin
Threshold Technology Inc.
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