Musical tone producing device of waveshape memory readout type

Details Musical tone producing device of waveshape memory readout type Musical tone producing device of waveshape memory readout type

1984-08-28

1988-04-19

Witkowski, S. J.

Music

Instruments

84 126, 84 127, 84 128, 84DIG9, G10H 112, G10H 146, G10H 700

Patent

active

047381795

ABSTRACT:
In a typical musical tone producing device of a full waveshape readout type, a full waveshape of a musical tone to be produced from the start to the end of sounding or a rise portion and a part of the waveshape following the rise portion of the musical tone is stored in a waveshape memory, and the musical tone is formed by reading out the waveshape from the waveform memory once, or reading out the rise portion once and thereafter reading out the partial waveshape repeatedly. A digital filter is introduced following the waveshape memory in this tone producing device. The filter characteristics is determined in accordance with a tone color change parameter such as the key touch or the tone pitch of the musical tone, thereby realizing a tone color change of the musical tone. Further, in order to realize timewise change of tone color of the musical tone, the circuit which has the tone color change parameter vary with time is proposed.

REFERENCES:
patent: 3651730 (1972-03-01), Adachi
patent: 3819844 (1974-06-01), Isii
patent: 3965789 (1976-06-01), Pearlman
patent: 4176577 (1979-12-01), Yamada et al.
patent: 4383462 (1983-05-01), Nagai
patent: 4416178 (1983-11-01), Ishida
patent: 4444082 (1984-04-01), Whitefield
patent: 4536853 (1985-08-01), Kawamoto et al.
patent: 4548119 (1985-10-01), Wachi et al.
patent: 4641564 (1987-02-01), Okamoto

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