Musical waveshape processing system

Details Musical waveshape processing system Musical waveshape processing system

1978-03-31

1981-03-10

Rubinson, Gene Z.

Music

Instruments

84 113, 84 126, 364718, G10F 100, G06F 102

Patent

active

042546818

ABSTRACT:
A musical waveshape processing system for an electronic musical instrument in which time-division time slots are set corresponding to a plurality of channels for producing notes selected on keyboards of the electronic musical instrument and the notes are each produced by repeatedly calculating the musical waveshape amplitude value of each channel in each time-division time slot. A musical waveshape calculator is provided which calculates the musical waveshape amplitude value as f(t)=at.sup.2 +bt+c based on waveshape data a, b and c and address information t. A multiplier is provided by which the value of an envelope synchronized with the time-division time slot is multiplied by the waveshape data a, b and c. A tone control circuit is provided which counts time-division multiplex signals of the ON-OFF state of a tone selection switch with a counter every frame of the time-division multiplexing and compares the count values of two successive frames to detect a change in the state of the tone selection switch from non-coincidence between the both count value, thereby controlling the musical waveshape.

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