Electronic musical instrument

Details Electronic musical instrument Electronic musical instrument

1980-06-20

1981-12-01

Witkowski, S. J.

Music

Instruments

84 103, G10H 500, G10H 700

Patent

active

043029990

ABSTRACT:
An electronic musical instrument includes twelve multiplexed wave data generators each of which corresponds to one of twelve musical notes in an octave and produces a multiplexed wave data signal which has a basic pulse frequency decisive of a note and has data indicating states of octavely related plural waves for the same note in a time-division-multiplexed manner. A note selection circuit selects a multiplexed wave data signal for the note designated by the depressed key. The selected wave data signal is converted by a shift register to parallel wave data signals, which are latched by a latch circuit. Selection of the octave is made by the latching time of the latch circuit determining the positions of the bits in the shift register to be latched. Rewriting of latched data in the latch circuit is effected each time the value of the data signal having the highest frequency among the wave data signals varies. The outputs of the latch circuit are used as address signals for reading musical tone waveforms from a waveform memory.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 4130043 (1978-12-01), Niimi
patent: 4179972 (1979-12-01), Hiyoshi et al.

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