On 06/26/2018 04:25 PM, Tim wrote:
On 06/26/2018 03:55 PM, Hans Wilmers wrote:
On 06/26/2018 08:32 PM, Spencer Jackson wrote:
I don't know of anyone really working on polyphonic pitch recognition in
the open source world. I think Bayesian filtering of some kind though
would be compelling. Perhaps some of the work from ISSE
(http://isse.sourceforge.net/) could be used and made realtime.
There is a SuperCollider plugin by Nick Collins called PolyPitch, which
does what the name suggests.
The source is GPL, and available here:
https://composerprogrammer.com/code.html
/ Hans
From Klapuri, "Multipitch analysis of polyphonic music and
speech signals using an auditory model", from PolyPitch:
"The method consists of a computational model of the
human auditory periphery, followed by a periodicity analysis
mechanism where fundamental frequencies are iteratively
detected and canceled from the mixture signal."
Wow. That seems much different than all the other papers I read.
Wonder how well it works, especially if applied to guitar.
It sort of reminds me of how I once was part of Sony's rollout of
Surround Retrieval System technology.
It was TV surround speakers modeled based on human hearing,
to make one pair of these speakers simulate a truer surround.
Tim.
Of the dozens of papers referenced by that, this one caught my eye:
"Fundamental frequency estimation of musical signals using a
two-way mismatch procedure"
https://pdfs.semanticscholar.org/c94b/56f21f32b3b7a9575ced317e3de9b2ad9081.pdf
IIUC this may be more in line with how this real product works.
I'm having a bit of a tough time with SC. Never used it before.
First the packages in SUSE were broken, so I built from source.
Now I can run the SC IDE and so on without errors. OK.
Next, I had to really hack the PolyPitch cmake file to
get it to install. OK.
But now what? I can't seem to run any examples. Some complain of
unexpected/unrecognized words, some complain of asking for
Mac Cocoa. Seems some stuff was built on Mac, like PolyPitch.
Any quick tips appreciated before I might pester the SC crowd.
Thanks.
Tim.
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