Music – Instruments
Patent
1975-06-23
1977-03-29
Witkowski, Stanley J.
Music
Instruments
84 126, 307221C, 323 73, 323 74, 323 80, 323 94R, 328 75, G10H 102
Patent
active
040142388
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 circuit is connected to control the states of conduction of the switches. Closure of a key-operated switch or the presence of a pulse in a predetermined time slot in a digital multiplex signal train causes clock pulses from an attack clock pulse source to be applied to the control circuit to selectively control the operation of the switches to shape the attach waveform of tone signals appearing on the output terminal as determined by the pattern of operation of the switches. Upon release of the key or termination of the pulse in the multiplex signal train, clock pulses from a decay clock generator are applied to the control circuit 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 control circuit.
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C.G. Conn, Ltd.
Witkowski Stanley J.
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