ATTACK_DECAY_GENERATOR

Published:2009/7/2 0:58:00 Author:May | From:SeekIC

Designed for polytonic electronic music system handling more than one note at a time. Each note to be controlled is sent through voltage-controlled amplifier (VCA) whose gain is set by charge on capacitor. Attack is changed by varying charging rate. Discharge rate sets decay of individual note. To avoid having separate adjustment pot for each VCA, duty-cycle modulation is used to change charging current through resistors. Attack pulses are generated by upper three inverters forming variable-symmetry astable MVBR. Decay pulses are generated by lower three inverters connected as half-mono MVBR. Additional half-monos can be added as needed for percussion, snubbing, and other two-step decay effects.-D. Lancaster, CM0S Cook-book.''Howard W.Sams.Indianapolis.IN.1977.p231－232



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