Pitch extractor circuit

Details Pitch extractor circuit Pitch extractor circuit

1979-12-14

1981-11-17

Witkowski, Stanley J.

Music

Instruments

84 111, 84 116, G10H 106, G10H 318

Patent

active

043004318

ABSTRACT:
A pitch extractor for an electronic musical instrument generates a digital count indicative of the period of the signal whose frequency is to be extracted and processes this count to provide an analog control voltage corresponding to this frequency; the control voltage is usable to control an electronic music synthesizer. The rate at which the pitch is extracted is enhanced by initially setting the system for the expected pitch of the musical source and thereafter adjusting it to the actual pitch of the source in a closed-loop manner as extraction proceeds.

REFERENCES:
patent: 3476863 (1969-11-01), Campbell
patent: 3539701 (1970-11-01), Milde
patent: 3591699 (1971-07-01), Cutler
patent: 3634596 (1972-01-01), Rupert
patent: 3647929 (1972-03-01), Milde, Jr.
patent: 3871247 (1975-03-01), Bonham
patent: 3902395 (1975-09-01), Avant
patent: 4151775 (1979-05-01), Merriman

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