ENSEMBLE EFFECT IN ELECTRONIC MUSIC INSTRUMENT

摘要

An ensemble effect is produced in a digital tone generator by providing a master data set of words having values corresponding to the relative amplitudes of equally spaced points along one cycle of the waveform of the audio tone. These values are transferred sequentially during repetitive cycles at a rate proportional to the pitch of the desired musical tone to a digital-to-analog converter for converting the master data set to an audio signal of the desired waveform and pitch. The ensemble effect is produced by transferring the words of the master data set to a second converter at the same pulse rate but having one value deleted or repeated once in the second set. Because the second set :has one less or one extra value in the set, the resulting audio tones from the two sets change phase with each successive cycle of the audio signals.