[mirtoolbox] Re: Chroma calculation

  • From: MJ McVicar <Matt.McVicar@xxxxxxxxxxxxx>
  • To: mirtoolbox@xxxxxxxxxxxxx
  • Date: Tue, 30 Mar 2010 11:29:58 +0100

Hi Oliver,
indeed this is the advantage to the CQ transform. There is some code written by here: 

<http://hans.fugal.net/research/cq-octave/cq.m>

which is explained here:

<http://lad.linuxaudio.org/events/2009_cdm/Saturday/21_Fugal/21.pdf>
but thought I'd see if MIRtoolbox is doing this already before implementing myself! 

Matt
--On Tuesday, March 30, 2010 12:18 PM +0200 Olivier Lartillot <olartillot@xxxxxxxxx> wrote: 


Dear Matt,

Currently mirchromagram is based only on FFT, without constant Q
transform, which means the FFT needs to be computed with a quite high
frequency resolution, whereas the use of a constant Q transform would
make the computation more efficient. Did I understand correctly the
advantage of constant Q transform for chromagram computation?

So it would be nice to add this transform in MIRtoolbox. Does anyone have
suggestion concerning how to implement it?

Thanks,

Olivier

MJ McVicar kirjoitti 30.3.2010 kello 11.52:


Dear list,

is the chromagram computation based entirely on an FFT (after filtering)
or is the constant Q-transform taken implicitly?

Thanks in advance,

Matt

----------------------
MJ McVicar
mm4819@xxxxxxxxxxxxx








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mm4819@xxxxxxxxxxxxx

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