Electronic musical instrument including waveshape memory and mod

Details Electronic musical instrument including waveshape memory and mod Electronic musical instrument including waveshape memory and mod

1987-10-15

1993-03-02

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84624, G10H 106, G10H 702

Patent

active

051911612

ABSTRACT:
In this electronic musical instrument a musical tone is generated by repetitively reading out a waveshape stored in a memory. Repetitive sets of phase information are produced, such phase information thus being a linear saw-tooth-like digital signal having a repetition period corresponding to the frequency of the generated musical tone. Phase distorting means modifies the shape of the phase information so as to distort said linear saw-tooth-like signal, without changing the repetition period thereof. The resultant altered phase information is used to access said memory so that during the supply of each of said repetitive sets, successive samples in different portions of said stored waveshape respectively are read out at different effective rates. Thus the waveshape samples read out from said memory will constitute a musical tone having changed tone color but unchanged pitch.

REFERENCES:
patent: 3794748 (1974-02-01), Deutsch
patent: 3809786 (1974-05-01), Deutsch
patent: 3895553 (1975-07-01), Kawamoto
patent: 3978755 (1976-09-01), Woron
patent: 4018121 (1977-04-01), Chowning
Albert G. Fadell, Calculus with Analytic Geometry, copyright .COPYRGT. 1964, by D. Van Nostrand Company, Inc., Princeton, N.J., Library of Congress Catalog Card No. 64-17960, pp. 53-55.
"The Synthesis of Complex Audio Spectra by Means of Frequency Modulation" by John M. Chowning, Journal of the Audio Engineering Society, Sep. 1973, vol. 21, No. 7, pp. 526-534.
Max V. Mathews, The Technology of Computer Music, the MIT Press, 1969, pp. 115-120, 126-138.

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