Electronics musical instrument

Details Electronics musical instrument Electronics musical instrument

1976-04-20

1978-04-04

Schaefer, Robert K.

Music

Instruments

84 103, 84 119, 84 124, G10H 100

Patent

active

040820270

ABSTRACT:
In this electronic musical instrument, two separate tone generators of different type each produce a tone corresponding to an actuated key switch. Advantageously, one of the tone generators is of the Fourier synthesis type. In the other tone generator, a source waveshape having abundant harmonic components is processed by a tone color and volume control system which modifies the frequency spectrum and amplitude of the source waveshape in a time variant manner. The two generated tones are combined to produce the desired musical note.
Actuation of each key switch produces, in an assigned time slot, frequency information corresponding to the selected note, and designating the phase angle between successive sample points to be read from a waveshape memory. In the Fourier synthesis type generator, plural waveshape memories store harmonically related sinusoids, all of which are accessed simultaneously and weighted by harmonic coefficients to produce the first tone. In the other tone generator, a waveshape having abundant harmonics is read from a waveshape memory and is processed by that one of a plurality of tone color and volume control systems which is assigned to the corresponding time slot.

REFERENCES:
patent: 3610800 (1971-10-01), Deutsch
patent: 3801721 (1974-04-01), Bunger
patent: 3821714 (1974-06-01), Tomisawa et al.
patent: 3844379 (1974-10-01), Tomisawa et al.
patent: 3854365 (1974-12-01), Tomisawa et al.
patent: 3882751 (1975-05-01), Tomisawa et al.
patent: 3902396 (1975-09-01), Hiyoshi
patent: 3903775 (1975-09-01), Kondo et al.
patent: 3939750 (1976-02-01), Inoue et al.
patent: 3948139 (1976-04-01), Melcher et al.
patent: 3979989 (1976-09-01), Tomisawa et al.
patent: 3979996 (1976-09-01), Tomisawa et al.
patent: 3981217 (1976-09-01), Oya
patent: 3986423 (1976-10-01), Rossum

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