Tone generator system for an electronic organ

Details Tone generator system for an electronic organ Tone generator system for an electronic organ

1977-08-15

1979-11-13

Miska, Vit W.

Music

Instruments

84113, 84 126, 84DIG23, G10H 300, G10H 102

Patent

active

041739167

ABSTRACT:
A tone generator system for an electronic organ which is capable of being fabricated into an LSI structure and receives a saw-tooth wave or staircase wave as an input thereto comprises a frequency divider for the saw-tooth wave or staircase wave including a ladder resistor network and a complementary MOS FET devices, an analog switch having a wide dynamic range and a high linearity in input-output transfer characteristic constructed by MOS FET devices to serve as an indirect keying means, a sustain means including a novel structure of a variable impedance element which is constructed to control a channel current in a MOS FET device by varying a potential distribution in a source region, and an impedance converter constructed by complementary MOS FET devices and free from a D.C. level shift. With the above arrangement a tone generator system of high quality for an electronic organ is provided.

REFERENCES:
patent: 3637915 (1972-01-01), Hirano
patent: 3656008 (1972-04-01), Nakagomi
patent: 3708603 (1973-01-01), Reagle et al.
patent: 3746775 (1973-07-01), Uchiyama

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