Music – Instruments
Patent
1978-09-11
1979-12-25
Dobeck, B.
Music
Instruments
84 126, 84DIG20, 84DIG8, G10H 104, G10H 500
Patent
active
041799690
ABSTRACT:
In a tone generating apparatus for an electrical music instrument having an array of switches corresponding to respective keys of a keyboard and which are selectively actuable by manipulation of the respective keys, a timing signal generator, preferably including a shift register, has a repetitive operating cycle and is connected with the switches for providing timing signals in response to actuation of the latter, with each of the timing signals occurring at a time during the operating cycle which corresponds to the position of the respective actuated switch in the switch array, an exponential signal generator provides an exponential signal in synchronism with the operating cycle of the timing signal generator, a sample and hold circuit receives the exponential signal and is operative to sample and hold a value of the exponential signal in dependence on the time of occurrence of a timing signal in the operating cycle, and variable frequency oscillator controlled in accordance with the value of the exponential signal which is sampled and held for providing an output oscillation having a frequency determined by a selectively actuated one of the switches.
REFERENCES:
patent: 3760358 (1973-09-01), Isii et al.
patent: 3986423 (1976-10-01), Rossum
patent: 4073209 (1978-02-01), Whittington et al.
patent: 4077298 (1978-03-01), Kondo
Dobeck B.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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