Music – Instruments
Patent
1979-11-15
1981-06-09
Witkowski, Stanley J.
Music
Instruments
84 113, 84DIG2, 307231, 328137, 340147LP, G10H 1057, G10H 122
Patent
active
042717434
ABSTRACT:
An envelope signal generator which has a key depression/release signal generator for producing different output levels in response to key depression and key release, a switching circuit which is set to a first output level upon key depression and set to a second output level when the stored output level of an analog memory has reached a certain value, a preset circuit for outputting at least a level setting voltage and first and second time constant setting voltages relating to an envelope, a priority selector which is supplied with the key depression/release signal generator output, the switching circuit output and the level setting voltage and selects them in a predetermined order of priority, a first circuit for converting into a current the output from a voltage controlled amplifier supplied with the analog memory output and controlled by the first time constant setting voltage, a second circuit for converting into a current the output from a voltage controlled amplifier supplied with the analog memory output and controlled by the second time constant setting voltage, and an analog memory connected in common to the outputs of the first and second circuits, and in which the operative states of the first and second circuits are controlled in accordance with the output from the priority selector.
REFERENCES:
patent: 3948139 (1976-04-01), Melcher et al.
Kabushiki Kaisha Kawai Gakki Seisakusho
Witkowski Stanley J.
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