Librosa: About literature reference on constant q filter implementation

[juanbraga]

Hi everyone there!

First of all I wanna' say thank you all for your awesome work!

Said that, I was wondering if somebody could help me finding where in McVicar's dissertation I can find the filterbank implementation referenced in filters.constant_q().

Here is a copy of comment in the correspodent code:

_def constant_q(sr, fmin=None, n_bins=84, bins_per_octave=12, tuning=0.0,
window='hann', filter_scale=1, pad_fft=True, norm=1,
**kwargs):
r'''Construct a constant-Q basis.
This uses the filter bank described by [1]_.
.. [1] McVicar, Matthew.
"A machine learning approach to automatic chord extraction."
Dissertation, University of Bristol. 2013._

Thank you guys!

[mattmcvicar]

I guess I'm best placed to answer this one...

The paper you are referencing uses the chromagram features from my
dissertation - details can be found in Section 3.5 here:

http://www.mattmcvicar.com/wp-content/uploads/2014/02/thesis.pdf

The original implementation was in MATLAB and can be found here:

https://www.dropbox.com/s/tk5bn2azqp4a734/Harmony_Progression_Analyzer_Toolbox_ver1.2.zip?dl=0

On Wed, 2 Aug 2017 at 21:05, jbraga@github [e-mail] wrote:

Hi everyone there!

First of all I wanna' say thank you all for your awesome work!

Said that, I was wondering if somebody could help me finding where in
McVicar's dissertation I can find the filterbank implementation referenced
in filters.constant_q.

Here is a copy of comment in the correspodent code:

def constant_q(sr, fmin=None, n_bins=84, bins_per_octave=12, tuning=0.0,
window='hann', filter_scale=1, pad_fft=True, norm=1,
**kwargs):
r'''Construct a constant-Q basis.
This uses the filter bank described by [1]_.
.. [1] McVicar, Matthew.
"A machine learning approach to automatic chord extraction."
Dissertation, University of Bristol. 2013.

Thank you guys!

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Matt McVicar
Machine Learning Researcher
Jukedeck
contact: [email protected]
blog/website: www.mattmcvicar.com

[bmcfee]

A bit more context here: I'm not sure the current implementation bears much resemblance to Matt's, since it's been revised heavily between the 0.3.x and 0.5.x series. A more accurate ref might be

Schörkhuber, Christian, and Anssi Klapuri. "Constant-Q transform toolbox for music processing." 7th Sound and Music Computing Conference, Barcelona, Spain. 2010.

But note that we did not use that as a reference implementation, merely reimplemented the basic idea of the method.

[juanbraga]

Thanks guys for your response!