Digital signal processing

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For the purposes of filtering continuous signals, we're currently using this MIT-licensed DSP library:

http://code.google.com/p/dspfilterscpp/

We're working on our own SSE2-optimized filter library to speed things up when working with higher channel counts. But for now, the above library seems adequate for our needs.

If you want to see how it's used, check out the FilterNode and the Resampler, or, better yet, the demos on the library site.