[LAD] Polyphonic normal guitar to midi: Jam Origins' MIDI-Guitar

Hans Wilmers hanswil at notam02.no
Wed Jun 27 08:19:18 CEST 2018

On 06/26/2018 10:25 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.

I have used PolyPitch for resynthesis of violin sounds. It does detect
double stops, though there were also false positives.
I have no idea how it would perform with a guitar, but if you ask Nick
Collins, he will give you a hint.

/ Hans

Hans Wilmers
Sandakerveien 24 D, bygg F3
N-0473 Oslo Norway
tlf.: +47 22358060
mob.: +47 92459361

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