System for expanding the dynamic volume range of electronic musi

Details System for expanding the dynamic volume range of electronic musi System for expanding the dynamic volume range of electronic musi

1981-02-20

1982-07-13

Truhe, J. V.

Music

Instruments

84 124, 84 126, G10H 300

Patent

active

043388450

ABSTRACT:
An electronic musical instrument wherein depression of a key entails the discharge of a primary capacitor which is connected to the inverting input of an operational amplifier whose output is connected with a second capacitor serving to supply envelope control voltage signals to an analog switch which connects a tone signal generator with a tone processing unit. The extent to which the primary capacitor discharges depends on the speed of movement of the key from non-depressed to depressed position, and the intensity of residual voltage of the partially discharged primary capacitor determines the intensity of the envelope control voltage signal. The speed at which the second capacitor discharges can be regulated to produce sustain or banjo effects. The second capacitor is in series with a resistor in a feedback conduit connecting the output and the input of the operational amplifier. A second feedback connection contains a diode which ensures that a reference potential is applied to the input of the operational amplifier while the primary capacitor is charged in non-depressed position of the key.

REFERENCES:
patent: 3634594 (1972-01-01), Hiyama
patent: 3652774 (1972-03-01), Ohno
patent: 3935783 (1976-02-01), Machanian et al.
patent: 4099439 (1978-07-01), Luce
patent: 4213367 (1980-07-01), Moog

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