Music – Instruments – Electrical musical tone generation
Patent
1994-04-14
1996-05-07
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
G10H 1057
Patent
active
055148310
ABSTRACT:
An envelope waveform producing circuit includes a ROM for storing a plurality of groups of parameter data, each group of parameter data defining a waveform of an envelope which includes data representing at least one of an attack rate and an attack level and data representing at least one of a decay rate and a sustain level, an address designator, connected with the ROM, for reading out a desired group of parameter data from the ROM to cause an envelope waveform to be produced in accordance with the parameter data read out, an UP/DOWN counter for selectively counting up and down from a preset value, a coincidence detector, connected with the UP/DOWN counter, for detecting coincidence between a counted value of the UP/DOWN counter and a predetermined value, a control circuit, connected with the UP/DOWN counter and the address designator, for controlling the address designator to read out desired parameter data and for controlling the UP/DOWN counter to count up or down from the preset value, and activation or deactivation of the UP/DOWN counter.
REFERENCES:
patent: 4426904 (1984-01-01), Ishibashi
patent: 4961364 (1990-10-01), Tsutsumi et al.
patent: 5033352 (1991-07-01), Kellogg et al.
patent: 5256831 (1993-10-01), Kozuki et al.
Seikosha Co. Ltd.
Witkowski Stanley J.
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