Envelope waveform generation apparatus

Details Envelope waveform generation apparatus Envelope waveform generation apparatus

1991-07-09

1993-10-26

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84663, G10H 1057

Patent

active

052568318

ABSTRACT:
An envelope waveform generation apparatus comprises an envelope waveform signal generator for forming an envelope waveform signal, a specific position setting member for setting a specific position, a position comparator and a key OFF controller. When a key OFF event is detected, the position comparator compares a position and/or level on the envelope waveform with those of the specific position, and the key OFF controller decays the level of the envelope waveform signal in the shape of a predetermined key OFF waveform, or delays key OFF processing by the envelope waveform signal generator on the basis of the comparison result.

REFERENCES:
patent: 4119006 (1978-10-01), Whitefield
patent: 4373416 (1983-02-01), Endo et al.
patent: 4422363 (1983-12-01), Deforeit
patent: 4426904 (1984-01-01), Ishibashi
patent: 4662261 (1987-05-01), Akutsu
patent: 4909120 (1990-03-01), Horiki et al.
patent: 4928569 (1990-05-01), Kudo et al.
patent: 5074185 (1991-12-01), Nishikawa et al.
patent: 5094137 (1992-03-01), Matsumoto

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