Music – Instruments
Patent
1975-06-14
1976-11-16
Witkowski, Stanley J.
Music
Instruments
84454, 84DIG8, 84DIG18, 84DIG20, G10H 100, G10H 504
Patent
active
039916456
ABSTRACT:
An electronic musical instrument includes an oscillator for generating a signal at a frequency corresponding to that associated with a depressed key of the keyboard. The key selects a control voltage, from an exponential voltage divider, for controlling the frequency of a voltage controlled oscillator, which produces a frequency which is directly proportional to the control voltage and inversely proportional to a reference voltage. The reference voltage compensates for variations in the level of the supply voltage, so that the oscillator frequency is independent of the supply voltage.
REFERENCES:
patent: 3283057 (1966-11-01), Campbell, Jr.
patent: 3288904 (1966-11-01), George
patent: 3347973 (1967-10-01), Freeman
patent: 3490327 (1970-01-01), Volpe
patent: 3715444 (1973-02-01), Pearlman
patent: 3733955 (1973-05-01), Reinagel et al.
patent: 3767833 (1973-10-01), Noble et al.
patent: 3786166 (1974-01-01), Mieda
patent: 3828108 (1974-08-01), Thompson
patent: 3878754 (1975-04-01), Barnum
patent: R27983 (1974-04-01), Stearns
R. G. Hibberd, INTEGRATED CIRCUITS, McGraw-Hill Book Co., copyright 1969, pp. 1-11.
Norlin Music, Inc.
Witkowski Stanley J.
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