rectangular pulse wave used in subtractive sound synthesis suffer

from aliasing caused by the discontinuities in the waveform or its

derivative. Several algorithms for the reduction of aliasing dis-

tortion have been suggested, providing either complete removal

or great suppression of aliasing. Some antialiasing oscillators

utilize variable fractional delay ﬁlters as an essential part of

the algorithm. In this paper, these oscillators are reviewed with

an emphasis on motivating the use of the fractional delay ﬁlters.

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