Truncated decay system

Details Truncated decay system Truncated decay system

1977-03-03

1978-04-25

Schaefer, Robert K.

Music

Instruments

84 124, G10H 100

Patent

active

040856437

ABSTRACT:
In this monophonic pedal or truncated decay system, depression of a new pedal key immediately truncates tone production of a previously played, decaying note. If two notes are played simultaneously, both will sound until one is released, whereupon that tone will be truncated immediately without decay.
The inventive system operates with a time-shared electronic musical instrument wherein selected keys are assigned to respective time slots in a repetitive timing interval. During each such interval, a first flip-flop is set by occurrence of the first assigned pedal key. A second flip-flop cooperates with the first flip-flop, and is set during each time interval by occurrence of a second assigned pedal key. A third flip-flop is set at the end of each timing interval to copy the contents of the second flip-flop. The third flip-flop thus provides, during the subsequent timing interval, a signal indicating that two or more pedal keys are being played. Concurrence of this signal and another signal indicating that a pedal key has been released results in production of an inhibit signal that is used to prevent the sounding of such released, decaying pedal note.

REFERENCES:
patent: 3519723 (1970-07-01), Wiest
patent: 3610806 (1971-10-01), Deutsch
patent: 3844379 (1974-10-01), Tomisawa

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