Music – Instruments
Patent
1974-08-13
1976-08-31
Hix, L. T.
Music
Instruments
84 126, 307237, 323 73, 323 79, 323 80, 323 81, 328 75, G10H 102, H01P 122
Patent
active
039772918
ABSTRACT:
A digital keying system for an electronic organ comprises a voltage divider network consisting of weighted value resistors switched into or out of the circuit by corresponding switches. The network is connected to a tone signal output terminal, and a reversible counter is connected to control the states of conduction of the switches. Closure of a key-operated switch causes clock pulses from an attack clock pulse source to be applied to the reversible counter to selectively control the operation of the switches to shape the attack waveform of tone signals appearing on the output terminal as determined by the pattern of operation of the switches. Upon release of the key, clock pulses from a decay clock generator are applied to the counter to operate it in the reverse direction, establishing a decay envelope for the tone signal in accordance with the pattern of operation of the switches. Provisions are made for terminating the application of clock pulses in either direction when a maximum count for that direction has been reached by the counter.
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C. G. Conn Ltd.
Hix L. T,.
Witkowski Stanley J.
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