Control waveform generating apparatus for an electronic musical

Details Control waveform generating apparatus for an electronic musical Control waveform generating apparatus for an electronic musical

1989-06-30

1990-01-16

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84665, G10H 1057

Patent

active

048935395

ABSTRACT:
A control waveform generating apparatus for an electronic musical instrument generates a control waveform having at least a rising portion and a falling portion whose levels vary in a lapse of time. The control waveform is divided into a plurality of segment waveforms each of which includes a constant level portion (an interval portion) and at least one of the rising portion and the falling portion therein. The rising rates and falling rates and interval durations of the respective segment waveforms are selected by a player so that the control waveform having an arbitrary waveform can be obtained. When generating the control waveform, each of the plural segment waveforms is sequentially designated and outputted as a part of the entire control waveform. When the present segment waveform next to the preceding segment waveform is designated, the last level of the preceding segment waveform is maintained in a selected interval period. After this predetermined interval period is passed, the level of the present segment waveform increases or decreases according to a selected rising rate or falling rate.

REFERENCES:
patent: 4466097 (1984-08-01), Nose
patent: 4478525 (1984-10-01), Yamaguchi
patent: 4520708 (1985-06-01), Wachi
patent: 4532849 (1985-08-01), Drew
patent: 4538495 (1985-09-01), Sato
patent: 4696216 (1987-09-01), Asahi et al.

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