Wave forming circuit of an electronic tone generator

Details Wave forming circuit of an electronic tone generator Wave forming circuit of an electronic tone generator

1989-08-14

1990-05-15

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84665, 84DIG23, G10H 1057, G10H 500

Patent

active

049247476

ABSTRACT:
Circuitry for an electronic tone generator effectively isolates a tone modulating RC network from the electroacoustic output device and associated volume control systems. This isolation prevents low or variable impedance of the output portion of the generator from adversely affecting the charge and discharge rate of the RC network. Isolation circuitry includes a MOSFET connected in a source follower circuit to convert the voltage signal from the RC network to a comparable current signal which is amplified through a pair of MOSFETs in a current mirror circuit.

REFERENCES:
patent: 4018125 (1977-04-01), Nishimoto
patent: 4028979 (1977-06-01), Luce
patent: 4160402 (1979-07-01), Schwartz
patent: 4173916 (1979-11-01), Inoue et al.
patent: 4210053 (1980-07-01), Kimura
patent: 4213367 (1980-07-01), Moog
patent: 4273019 (1981-06-01), Goto
patent: 4306480 (1981-12-01), Eventott et al.
patent: 4408514 (1983-10-01), Suzuki
patent: 4545279 (1985-10-01), Sano
patent: 4559602 (1985-12-01), Bates, Jr.
patent: 4567806 (1986-02-01), Kodaira

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