Pfft + cascade?


    Feb 03 2007 | 5:07 pm
    Hi, I need help to figure out exactly what's happening in the following pfft subpatch.
    An audio-rate filter (cascade) is used to filter the amplitude values coming out of a Cartopol module (which should output fft bins)
    The two modules should be not compatible to each other. I mean, cascade shouldn't accept values from a poltocar module.
    Surprisingly for me, cascade does accept the signal from Poltocar and I need to figure out what exactly is happening.
    Can someone help me?
    Here's the pfft patch:
    max v2;
    Thanks in advance for your help.
    Carlo

    • Feb 03 2007 | 5:22 pm
      On 3-Feb-2007, at 18:07, Carlo Laurenzi wrote:
      > The two modules should be not compatible to each other. I mean,
      > cascade shouldn't accept values from a poltocar module.
      Why not? cartopol~ sends out signals. cascade~ accepts signals as
      input. cascade~ will perform whatever math it does with the input
      values.
      In MSP a signal is nothing more than a stream of floating point values.
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    • Feb 03 2007 | 5:43 pm
      a signal is a signal is a signal.
    • Feb 03 2007 | 5:47 pm
    • Feb 03 2007 | 10:28 pm
      > No, it makes no physical sense at all.
      haha i was waiting for somebody to say that.
      > But that's never stopped anyone from making a patch.
      >
      > It might actually sound quite interesting, although probably not the
      > way Carlo was hoping.
      maybe it is not even so uncommon to use "filters"/filters
      on fft bins. it might be a bit different than with a music
      signal but you can do stuff in there for sure.
      it would include [counter~] and some magic but certain
      "regular" filter types can giuve you certain results when
      used on fft bins.
      -110
    • Feb 04 2007 | 4:02 pm
    • Feb 05 2007 | 8:14 pm
      Carlo Laurenzi wrote:
      > Since I obtained some good sounds to use in a piece I would like to
      > know how to understand its behaviour.
      I guess it will somehow smear the signal, if you push high frequencies,
      it would enhance the difference between neighbouring bins, low
      frequencies would only affect what doesn't change too much over time,
      but only if its lower than the frame frequency... And I guess the bins
      will be a bit shuffled as well (but not arbitrarily...)
      > Can you suggest me how to understand and re-create this patch in a
      > correct way? Thank you very much.
      Whatever you'll find out is the correct way, you should turn this
      project into a PhD and become famous...
      Stefan
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      Stefan Tiedje------------x-------
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