Envelope generator

Details Envelope generator Envelope generator

1977-09-28

1980-01-29

Dobeck, B.

Music

Instruments

84 113, 364722, G10H 102, G06M 300

Patent

active

041855329

ABSTRACT:
An envelope generator is provided with a count circuit the count value of which is varied through addition or subtraction or combination thereof, and a conversion circuit which operates to convert the count value into amplitude data, so as to generate an envelope having a shape corresponding to variations with time of the count value. According to one aspect of the invention, the count circuit is a circuit which carries out computation for exponentially varying the count value through polygonal line approximation, so as to form an envelope of exponential characteristic. According to another aspect of the invention, the conversion circuit is a memory which has stored amplitude data corresponding to count values in advance so as to convert count values in the last linear region of the envelope obtained by the polygonal line approximation into amplitude data in exponential relation and to convert count values contained in the remaining polygonal line regions into amplitude data in linear relation.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3610805 (1971-10-01), Watson et al.
patent: 3632996 (1972-01-01), Paine et al.
patent: 3729625 (1973-04-01), Inoue
patent: 3930144 (1975-12-01), Tanaka

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