Electronic musical instrument having portaments property

Details Electronic musical instrument having portaments property Electronic musical instrument having portaments property

1978-05-22

1983-10-11

Weldon, Ulysses

Music

Instruments

84 101, 84 126, 84DIG20, G10H 102

Patent

active

044085141

ABSTRACT:
In a electronic musical instrument wherein a portamento is played by supplying the pitch voltage corresponding to a subsequently depressed key to a capacitor holding the pitch voltage corresponding to a previously depressed key, the charge and discharge currents of the capacitor corresponding to the difference between the two pitch voltages are controlled to vary exponentially thus changing exponentially the capacitor terminal voltage. The terminal voltage of the capacitor is applied to drive a voltage controlled oscillator to vary its oscillation frequency. To vary exponentially the terminal voltage of the capacitor, a mutual conductance converter is connected between the capacitor and a keyboard section and the output current from the mutual conductance converter is controlled by a control signal corresponding to the terminal voltage of the capacitor.

REFERENCES:
patent: 3789718 (1974-02-01), Bunger
patent: 3828110 (1974-08-01), Colin
patent: 3872764 (1975-03-01), Munch et al.
patent: 3880039 (1975-04-01), Studer
patent: 3886836 (1975-06-01), Hiyoshi
patent: 3948139 (1976-04-01), Melcher et al.

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