Kyle (@kastnerkyle)

Kyle Kastner is an engineer at Southwest Research Institute, and a graduate student at the University of Texas - San Antonio. His research interests include statistical signal processing, machine learning, and acoustics. He also enjoys playing music in his spare moments.

Polyphase Filters and Filterbanks

Kyle March 19, 201310 comments


Polyphase filtering is a computationally efficient structure for applying resampling and filtering to a signal. Most digital filters can be applied in a polyphase format, and it is also possible to create efficient resampling filterbanks using the same theories.

This post will walk through a reference implementation of both the downsampling polyphase filter and a downsampling polyphase filterbank using scipy, numpy, matplotlib, and python. It should also highlight some of...

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