Music – Instruments
Patent
1977-08-15
1980-05-06
Rubinson, Gene Z.
Music
Instruments
84 113, 364722, G10H 102, G06M 300
Patent
active
042011094
ABSTRACT:
An envelope waveform generator for electronic musical instruments which has a circuit for converting envelope clock pulses into a clock frequency having the pulse density corresponding to a musical sound frequency to vary the envelope speed in response to the musical sound frequency, a circuit for converting the output clock pulse from the abovesaid circuit into a clock frequency having the pulse density corresponding to an attack, sustain or release of a key switch to thereby control the speed of the attack and release, a pulse density function generator composed of a function generator whose output changes at every constant number of output clock pulses from the second-mentioned circuit and a pulse density multiplier for controlling the clock pulse density with the output from the function generator, and an envelope counter for counting the output pulses from the pulse density function generator to provide the sum of the pulse density functions as an envelope waveform.
REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3610805 (1971-10-01), Watson
patent: 3632996 (1972-01-01), Paine et al.
patent: 3952623 (1976-04-01), Deutsch
patent: 3977291 (1976-08-01), Southard
M. Schwartz, Information Transmisson, Modulation, and Noise, 1970, pp. 138-140, 151-155.
Isen Forester W.
Kabushiki Kaisha Kawai Gakki Seisakusho
Rubinson Gene Z.
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