[clam-devel] polyphonic pitch detection

[Rene Dohmen]

I asked almost the same question a month ago.
I hope yours gets answered
;-)


On Wed, Apr 27, 2011 at 5:17 AM, Nathan Stewart <swarfrat at gmail.com> wrote:

> I'm digging into clam - and not finding a lot of documentation, even in the
> source.
> I'm trying to look into the perennial polyphonic pitch detection, however I
> have a laundry list of constraints I'm willing to live with that hopefully
> might make it easer.
> I'm trying to do Guitar to MIDI, and so far the following have occurred to
> me:
> 1) I don't care if its real time, though it would be nice of course.
> 2) I'm not trying to process completely arbitrary mixed instrument
> soundscapes - one instrument, with a straightforward(?) harmonic structure.
> 3) There are a maximum of N note polyphony, where N is almost always 6.
> 4) The up to 6 notes must be composed of either open strings, or within 4
> frets of any other fretted note. (Not completely got my head around how this
> helps, but I think it could be useful)
> 5) The range is approximately 4 octaves
> 6) We can slap any filtering on there that helps.
>
> And of course discrimination of octaves vs harmonics is a tough problem.
>
> I've taken a look at TonalAnalysis and the MelSpectrum widgets, and I don't
> fully grasp whats coming out of either.
> The TonalAnalyis PitchProfile is a vector of floats, but what do they mean?
> Where does the line form for slaying this particular dragon?
>
> Also - I built and installed CLAM/processing, can see
> libclam_processing.so, but the NetworkEditor has no ConstantQTransform
> widget available.
>
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>
>
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