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I am looking for a fast and good quality algorithm for upsampling and downsampling by integer values (2x to be specific - should be enough). I started with a very simple one, from here: http://www.nicholson.com/rhn/dsp.html (http://www.nicholson.com/rhn/dsp.html), but it's not very fast when using a 4k window length, even if I pre-compute the coefficients. This is my first project dealing with audio, so my understanding of all this is still rather basic. Can anyone point me in the right direction?