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In our last article about the phase vocoder we saw how to create a basic phase vocoder for time-stretching. While it is by no means a simple MSP patch, it is a useful one.

Amnon Wolman creates music with technology and for instruments with two distinctive features: first, a subtle and complex relationship with popular culture and second, a concern for the dramatic nature of sonic evolution.

The phase vocoder is a tool used to perform time-stretching and pitch-shifting on recorded sounds. Its name derives from the early "vocoders" (contraction from "voice encoders"), which used a set of bandpass filters in parallel over many frequency bands, to crudely analyze and reconstruct speech.