Tone source for an electronic musical instrument

Details Tone source for an electronic musical instrument Tone source for an electronic musical instrument

1981-04-07

1982-03-16

Truhe, J. V.

Music

Instruments

84 101, G10H 106

Patent

active

043195113

ABSTRACT:
A tone source circuit for electronic musical instruments which enables the selection of a desired one of a plurality of waveshapes of different duty ratios and is suitable for fabrication as an integrated circuit. The tone source circuit is composed of a tone signal generator for producing a tone signal of a frequency corresponding to each tone, a frequency divider group for frequency dividing the tone signal to a plurality of stages in a sequential order, a waveshape forming circuit for obtaining a plurality of waveshapes of different duty ratios from output signals of the frequency dividing stages of the frequency divider group and/or a feet select circuit for selecting a plurality of combinations of frequency dividing stages of the frequency divider group, waveshape select means for selecting a desired waveshape from the plurality of waveshapes of different duty ratios and means for selectively deriving a signal of the selected waveshape in response to key depression.

REFERENCES:
patent: 3603809 (1971-09-01), Uchiyama
patent: 3636231 (1972-01-01), Schrecongost et al.
patent: 3835236 (1974-09-01), Adachi
patent: 4056033 (1977-11-01), Inoue
patent: 4083286 (1978-04-01), Faulkner
patent: 4116102 (1978-09-01), Tsunoo et al.
patent: 4226157 (1980-10-01), Klaiber et al.
Simonton, "Portable Mini-Organ", Radio-Electronics, Jan. 1977, pp. 31-34.

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