Envelope shape generator for tone signal control

Details Envelope shape generator for tone signal control Envelope shape generator for tone signal control

1987-11-13

1990-05-29

Grimley, A. T.

Music

Instruments

Electrical musical tone generation

84627, 84633, 84663, 84665, 84702, 84703, G10H 700, G10H 102, G10H 500

Patent

active

049285696

ABSTRACT:
An envelope shape generator generates envelope shape data for controlling a tone signal in the form of data in decibel representation. In performing a rapid attenuation control called "forcing damp" during attenuation of the envelope shape data generated by the envelope shape generator, the envelope shape data in decibel representation is rapidly attenuated with such a characteristic that inclination of attenuation becomes increasingly steeper. This is advantageous because inclination of a rapidly attenuating portion is modified to a substantially uniform inclination when the envelope shape data is converted to data in linear representation. There are also provided a detection circuit for detecting that the level of the envelope shape has dropped below a predetermined level corresponding to a minimum level at which a tone waveshape can be effectively represented and a circuit for rapidly attenuating the envelope shape in response to this detection. This contributes to elimination of noise.

REFERENCES:
patent: 4079650 (1978-03-01), Deutsch et al.
patent: 4178826 (1979-12-01), Hiyoshi et al.
patent: 4267763 (1981-05-01), Futamase et al.
patent: 4357849 (1982-11-01), Ezawa et al.
patent: 4422363 (1983-12-01), Deforeit
patent: 4763257 (1988-08-01), Clynes

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