1980-05-30
1988-08-09
Isen, Forester W.
Music
Instruments
84 113, 364722, G10H 102
Patent
active
RE0327263
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 et al.
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
patent: 4079650 (1978-03-01), Deutsch et al.
patent: 4083285 (1978-04-01), Chibana
patent: 4085644 (1978-04-01), Deutsch et al.
patent: 4128032 (1978-12-01), Wada et al.
In re Constant, 3USPQ 2nd at 1479.
Aoki Eiichiro
Hiyoshi Teruo
Nakada Akira
Yamada Shigeru
Yamaga Eiichi
Isen Forester W.
Nippon Gakki Seizo Kabushiki Kaisha
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