Music – Instruments – Electrical musical tone generation
Patent
1990-03-05
1991-12-24
Shoop, Jr., William M.
Music
Instruments
Electrical musical tone generation
84663, G10H 1057
Patent
active
050741853
ABSTRACT:
An envelope-generating apparatus for an electronic musical instrument is disclosed. The apparatus which generates an envelope signal for a musical tone includes a rate detector for detecting the actual rate-of-change of the envelope signal at an instant before quick-attenuation of the signal is to commence, and a quick-attenuation controller for first setting a predetermined attenuation rate for the envelope signal based on the actual rate-of-change detected by the rate detector and thereafter controlling quick-attenuation of the envelope signal. The apparatus further could include a level detector for detecting an actual envelope signal level at an instant before quick-attenuation commences. Also, in place of the rate detector, a musical pitch-detector for detecting the actual pitch of a musical tone being generated could be provided, or a characteristics-detector for detecting musical tone characteristics of a newly generated tone, or volume-detector means for detecting the total tone volume of all musical tones being generated could be provided. Such different detectors provide different data utilized by the apparatus or instrument to optimize the quick-attenuation process by accelerating it without causing any noticeable click noise.
REFERENCES:
patent: 4649783 (1987-03-01), Strong et al.
patent: 4909120 (1990-03-01), Horiki et al.
patent: 4928569 (1990-05-01), Kudo et al.
Nishikawa Masashi
Otsuka Satoshi
Rokkaku Fumio
Umeta Mitsuhiro
Roland Corporation
Shoop Jr. William M.
Sircus Brian
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