> My signal processing background is not too strong, so maybe someone could
> clarify this for me: if I have two (equally long) sections of two sound
> files, and I'd like to measure how similar those two sections are, I need
> to calculate their cross-correlation, correct? Is there a way to do this in
> csound? I've skimmed the manual but couldn't find anything.

I don't know if this tool is useful for your purpose, however you
make your experience. In the time domain

  sig1 `corr' sig2  =  time-reversal of sig1 `conv' sig2

The autocorrelation

  sig `corr` sig

is useful for pitch detection; if sig is periodic, you see periodic
peaks in the autocorr func.

A simple example of corr with mono soundfiles is

<CsoundSynthesizer>
<CsInstruments>
sr     = 44100
ksmps  = 64
nchnls = 1

instr 1
  Sig1 = "foo.wav"
  Sig2 = "bar.wav"
  ilen1  filelen Sig1
  ilen2  filelen Sig2
  p3 = ilen1+ilen2
  ;; sig1 reversed
  ain  diskin2 Sig1, -1, ilen1
  aout pconvolve ain, Sig2
  out aout*0.0003
endin
</CsInstruments>
<CsScore>
i1 0 1
</CsScore>
</CsoundSynthesizer>

tito


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