Music – Instruments
Patent
1975-06-19
1977-06-14
Jackmon, E. S.
Music
Instruments
84 101, 84 103, 84423, G10H 102, G10F 100, G10C 312
Patent
active
040289796
ABSTRACT:
An electronic musical instrument has a ring oscillator incorporating a multiplicity of identical stages connected to form a ring with the output of each stage being connected to the input of the succeeding stage. Each stage has an RC time constant circuit which introduces a delay in the transmission of a signal from one stage to the next, in accordance with the value of the capacitance of the RC circuit. The capacitance is varied in response to the amount of pressure acting on a key of the keyboard of the musical instrument, and the interval between a succession of pulses presented to an output terminal of the oscillator is dependent upon the force with which the keys are depressed, and the positions within the output pulse train at which such delays are introduced is dependent upon the position of the keys of the keyboard. The output pulse train contains information identifying all of the operated keys of the keyboard and the force with which they are operated. This information is decoded to select one of a plurality of tones produced by a tone signal source, and is also decoded to produce such tones with amplitudes corresponding to the force with which their corresponding keys are depressed.
REFERENCES:
patent: 3725562 (1973-04-01), Munch et al.
patent: 3746773 (1973-07-01), Uetrecht
patent: 3842184 (1974-10-01), Kniepkamp
patent: 3899951 (1975-08-01), Griffith
patent: 3968716 (1976-07-01), Clark, Jr. et al.
Jackmon E. S.
Norlin Music, Inc.
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