Electrical apparatus for determining the pitch or fundamental fr

Details Electrical apparatus for determining the pitch or fundamental fr Electrical apparatus for determining the pitch or fundamental fr

1977-08-31

1979-05-01

Witkowski, Stanley J.

Music

Instruments

84 116, G10H 100, G10H 300

Patent

active

041517750

ABSTRACT:
An electrical apparatus for determining the fundamental frequency of a musical note wherein the apparatus comprises a plurality of means for generating and responding to pulse type signals. More particularly, first and second means responsive to an electrical representation of the musical note are provided for generating first and second pulse trains whose pulses corresponding to the maxima and minima, respectively, of the electrical representation. The aforesaid first pulse train is applied to a first input of a first logic circuit means whose second input is fed a further pulse train from the output of a second logic circuit means.
The second logic circuit means provides at its output either the second pulse train or a pulse train whose pulses are delayed relative to the pulses of the pulse train at the output of the first logic circuit means. In particular, during the initial stages of the electrical representation, the second logic circuit means is controlled to couple the former pulse train to its output and, thereafter, the latter pulse train.
With the logic circuit means so controlled and with the first logic circuit means designed to provide an output pulse only for successively occurring pulses at its first and second inputs, respectively, the output pulse train of the first logic circuit means will have a fundamental frequency which accurately portrays that of the electrical representation and, hence, the musical note represented thereby.

REFERENCES:
patent: 3539701 (1970-11-01), Milde
patent: 3634596 (1972-01-01), Rupert
patent: 3647929 (1972-03-01), Milde, Jr.

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