Tone wave generator in electronic musical instrument

Details Tone wave generator in electronic musical instrument Tone wave generator in electronic musical instrument

1977-10-13

1979-12-25

Weldon, Ulysses

Music

Instruments

84 101, 84 117, 84 119, 84 124, G10H 300

Patent

active

041799720

ABSTRACT:
In an electronic musical instrument, the keys of a keyboard are divided into a plurality of groups by octaves, and a wave generator is provided with a memory for storing constants corresponding to musical tone frequencies to be generated according to the notes includes in a desired group out of the plurality of group, an accumulator for repeatedly adding the constants read out of the memory, and a bit position shifting circuit for shifting the bit position of the data produced by the accumulator according to the octave range of a note to be produced, thereby to obtain the data varying repeatedly according to the frequency of a note to be produced, and to reduce the storing capacity of the memory when compared to the number of keys.

REFERENCES:
patent: 3610800 (1971-10-01), Deutsch
patent: 3697661 (1972-10-01), Deutsch
patent: 3910150 (1975-10-01), Deutsch et al.
patent: 4011784 (1977-03-01), Fukui
patent: 4052924 (1977-10-01), Deutsch et al.
patent: 4114497 (1978-09-01), Hiyoshi et al.

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