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Multirate DSP FAQ   by Grant R. Griffin

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Multirate DSP is a fundamental technique of Digital Signal Processing. This is dspGuru's mini-FAQ of "Frequently Asked Questions" on Multirate Digital Signal Processing:

Part 1: Basics

What Multirate Digital Signal Processing is, and why we do it.

Part 2: Decimation

About reducing sampling rates by integer factors.

Part 3: Interpolation

About increasing sampling rates by integer factors.

Part 4: Resampling

About combining interpolation and decimation to change sampling rates by rational factors.

Implementation Software

Our "multirate_algs" package includes decimation, interpolation and resampling routines. You can download it from dspGuru's DSP Algorithm Library.

Acknowledgement:

Many thanks to Jim Thomas for reviewing this FAQ and providing lots of great suggestions. Thanks, Jim!