Music – Instruments
Patent
1975-03-03
1976-07-27
Hix, L. T.
Music
Instruments
84 113, 84 124, G10H 102, G10H 502
Patent
active
039712842
ABSTRACT:
A plural mode envelope generator in which a basic time constant circuit is coupled by selector switches to a plurality of envelope generating means which function under the control of one or both of a keydown detector and a legato pulse generator. Fast attack-short substain and slow attack-long sustain envelope circuits involve standard techniques. A dual mode percussion circuit provides post key release sustain in one mode when the keydown detector is decoupled from the circuit and post key release tone snubbing when the keydown detector is coupled to the circuit. A sostenuto circuit with flip-flop latch includes a reset gate to hold the flip-flop in reset until sostenuto keying is desired whereupon a unidirectional circuit couples the initial keydown signal to the latch to place the flip-flop in a set state but prevents the disappearance of that signal from resetting the latch.
REFERENCES:
patent: 2972273 (1961-02-01), Hanert
patent: 3558796 (1971-01-01), Harris
patent: 3570357 (1971-03-01), Adachi
patent: 3571481 (1971-03-01), Adachi
patent: 3821458 (1974-06-01), Schreier
patent: 3828110 (1974-08-01), Colin
patent: 3886834 (1975-06-01), Okamoto
patent: 3886836 (1975-06-01), Hiyoshi
patent: 3897709 (1975-08-01), Hiyoshi et al.
Bergstedt Lowell C.
Hammond Corporation
Hix L. T,.
Witkowski Stanley J.
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