Fundamental frequency extracting system

Details Fundamental frequency extracting system Fundamental frequency extracting system

1981-04-13

1983-03-29

Truhe, J. V.

Music

Instruments

84 124, 84454, 84DIG18, 324 77E, 324 78F, G10H 100, G01R 2365

Patent

active

043779611

ABSTRACT:
A system for extracting the fundamental frequency or pitch of complex waves such as voice, musical instruments or other audio signals. Separate channels extract the fundamental frequency component when it is present in successively wider frequency bands, the frequency intervals between which are equal or less than an octave. Control signals generated in response to the presence of the fundamental components in any lower frequency channel inhibit each of the higher frequency channels thereby reducing the possibility of an overtone being detected as a fundamental frequency component of the complex wave.

REFERENCES:
patent: 3364425 (1968-01-01), Peterson et al.
patent: 3395345 (1968-07-01), Rader
patent: 3439122 (1969-04-01), Coker
patent: 3766818 (1973-10-01), Prohofsky
patent: 3901120 (1975-08-01), Youngquist
patent: 4077298 (1978-03-01), Kondo
patent: 4280387 (1981-07-01), Moog
Millman and Halkias, Integrated Electronics, 1972, pp. 572-573.
Lancaster, Active Filter Cookbook, 1975, p. 14.

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