Method and apparatus for speech identification

Details Method and apparatus for speech identification Method and apparatus for speech identification

1973-05-08

1976-11-02

Claffy, Kathleen H.

G10L 100

Patent

active

039898962

ABSTRACT:
The use of electronically tunable filters permit an efficient extraction of characteristic speech features, such as pitch frequency and the position of spectral peaks, called formants, that are present in vowels and voiced consonants. A pair of electronically tunable active filters each controlled for CF and Q, are utilized to "lock in" on a particular formant and to follow its inflections. The control voltage supplied to the active filters directly corresponds to the formant position and gives an inexpensive and simple technique for the characterization of voiced phonemes.

REFERENCES:
patent: 2575910 (1951-11-01), Mathes
patent: 2819341 (1958-01-01), Barney
patent: 2857465 (1958-10-01), Schroeder
patent: 3423530 (1969-01-01), Coulter
patent: 3437757 (1969-04-01), Coker
patent: 3509280 (1970-04-01), Jones
patent: 3700815 (1972-10-01), Doddington
patent: 3787774 (1974-01-01), Tietze

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