Tone generator system for an electronic organ

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

1975-10-14

1977-11-01

Schaffer, Robert K.

Music

Instruments

84 101, 84 122, G10H 102

Patent

active

040560333

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 the potential distribution in the source region, and an impedance coverter 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: 3535431 (1970-10-01), Szabo
patent: 3603809 (1971-09-01), Uchiyama
patent: 3627895 (1971-12-01), Savon
patent: 3654558 (1972-04-01), Tomisawa
patent: 3837254 (1974-09-01), Southard

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