Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1984-12-17
1988-06-21
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 500
Patent
active
047529580
ABSTRACT:
The device obtains several characteristic parameters from a standard sentence said by a speaker and compares them with average parameters of the same speaker stored in an internal memory and previously calculated. According to the comparison, it obtains a probability value that the sentence spoken belongs to that speaker and compares the value with a threshold normalized to the average parameter variance by a threshold calculation circuit. If the threshold is overcome, the device considers the speaker verified. A circuit determines the real instants of sentence beginning and end using a noise-adaptive threshold in order to limit between these two instants the time interval over which characteristic parameters are to be calculated. A circuit aligns as to time the characteristic parameters just calculated to the parameters of a reference sentence, obtaining standard lengths of the sounds composing the sentence spoken. A variable probability threshold is controlled by the standard deviations of the histogram of the average of the characteristic parameter vectors.
REFERENCES:
patent: 4084245 (1978-04-01), Bunge
patent: 4292471 (1981-09-01), Kuhn
patent: 4535473 (1985-08-01), Sakata
Article, "An Algorithm for Determining the Endpoints of Isolated Utterances" (Bell System Technical Journal, Feb. 1975).
Article, "Dynamic Programming Algorithm Optimization for Spoken Word Recognition", IEEE Transactions . . . , Feb. 1978.
Article, "Considerations in Applying Clustering Techniques . . . " (Journ. Acoustical Soc. of America, 1979).
Article, "A Low Cost Speaker Verification Device", M. H. Kuhn-1980.
Cavazza Michele
Ciaramella Alberto
Cselt-Centro Studi e Laboratori Telecomunicazioni S.p.A.
Dubno Herbert
Kemeny Emanuel S.
Ross Karl F.
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