Tone generation method with envelope computation separate from waveform synthesis

摘要

An electronic musical apparatus utilizes a central processing unit for working a player module, driver module, sound source module and timing module, while controlling a work load of the central processing unit. The player module provides a sequence of event data indicating an event of a music tone and timing data indicating an occurrence time of the event. The driver module is intermittently triggered to process the event data for creating control parameters reserved for use in generation of the music tone corresponding to the event data, and for determining an envelope of the music tone according to the control parameters, the envelope being also reserved for use in generation of the music tone. The sound source module is routinely triggered to load therein the reserved control parameters and the envelope for generating the music tone according to the timing data. The timing module issues a synchronous trigger signal effective to routinely trigger the sound source module, and issues an asynchronous trigger signal independently of the timing data for intermittently triggering the driver module so as to avoid concentration of the work load of the central processing unit.