Fundamental frequency variation for a musical tone generator usi

Details Fundamental frequency variation for a musical tone generator usi Fundamental frequency variation for a musical tone generator usi

1986-04-17

1987-10-27

Witkowski, S. J.

Music

Instruments

84 119, 84 128, G10H 106, G10H 700

Patent

active

047021420

ABSTRACT:
A keyboard operated musical instrument is disclosed in which musical tones are created by reading out data values stored in a waveshape memory. The number of stored data points is reduced by storing the data values in segments corresponding to one-half of the number of data points for a period of a waveshape. By using synthesized data having a symmetry about the midpoint, the second half of the waveshape is recovered by a forward and backward memory address read of each waveshape segment. After reading each segment a predetermined number of cycles, an abrupt jump is made to the next segment of waveshape data points. The fundamental frequency of the tone is varied in a temporal manner by changing the memory advance rate of reading waveshape data out of memory in response to a frequency offset data corresponding to each segment of the waveshape data. An alternative embodiment is disclosed for a tone generator in which the musical waveshape is computed in real time from stored sets of harmonic coefficients.

REFERENCES:
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 3908504 (1975-09-01), Deutsch
patent: 3978755 (1976-09-01), Woron
patent: 4273018 (1981-06-01), Deutsch
patent: 4442745 (1984-04-01), Gross et al.
patent: 4579032 (1986-04-01), Deutsch
patent: 4638710 (1987-01-01), Kitamura et al.

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