Pitch detector and method thereof

Details Pitch detector and method thereof Pitch detector and method thereof

1978-05-05

1979-08-14

Claffy, Kathleen H.

179 1D, G10L 100

Patent

active

041646266

ABSTRACT:
A pitch and voiced/unvoiced detector comprising a low pass filter or variable cutoff frequency low pass filter for providing a constant power output, DC shifting and weighting circuits operating on the filtered analog signals, a summing circuit for the filtered and weighted signals, a peak detector with controlled exponential decay time and timing circuits which are used to distinguish pitch and voiced/unvoiced structure in the analog input signal.

REFERENCES:
patent: 3376387 (1968-04-01), Cassel
patent: 3377428 (1968-04-01), Dersch
patent: 3740476 (1973-06-01), Atal
patent: 4000369 (1976-12-01), Paul et al.
R. Barber et al., "Formant Tracking System", IBM Tech. Discl. Bull., vol. 8, No. 5, Oct. 1965, p. 756.
E. Nassimbene, "Voicing Detector", IBM Tech. Discl. Bull., vol. 7, No. 10, Mar. 1965, p. 923.

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