[PD] suggestions for spectral "weight" anaylsis

[William Brent]

Hi Eran, the order-perc.pd example in that same 06-timbre-ordering
directory shows how to do those kinds of things. It packs several features
together into one mixed feature list, normalizes the feature database, and
provides controls for weighting the different features via the "weights"
message to [timbreID].


On Fri, Jan 3, 2014 at 7:03 AM, Eran Sachs <eransachs at hotmail.com> wrote:

> Hello João,
> Take a look at example 06 in William;s tID, which does timbral ordering of
> small grains quite similar to what you are describing.
> I was really happy with what I got, but I had a vaguer idea in mind...
>
> William, is there a way to choose certain "descriptors" for the
> reordering? Or to give different "weight" to certain parameters?
>
> Happy 2014, list!
> Zax
>
>
>
>
>
> ------------------------------
> To: william.brent at gmail.com
> Date: Fri, 3 Jan 2014 11:30:17 +0100
> From: jmmmpais at googlemail.com
> CC: pd-list at iem.at
> Subject: Re: [PD] suggestions for spectral "weight" anaylsis
>
>
> Hi William and all,
>
> I thought there would some relevant things in your library. I'll look into
> your suggestions later.
> I don't have a patch that other people can look at, but I can try to
> explain the context a bit better:
> - I have a sound of ~40s spoken voice. I'm going to split it in fragments
> (for now 100ms each) and reorder them
> - one of the possibilities of reordering the fragments would be to have a
> "continuous" timbre change in the end. E.g. going from noisy consonants to
> clean vowels
> - for the analysis, I guess a mixture of pitch and harmonicity (don't know
> yet in which order it should be done) would be adequate
>
> I noticed your objects work in real time. As the analysis is to be done
> before the performance, I guess I'll either let the sound play throughout
> to get the analysis data, or then I'll divide the fragments through x
> analysis patches, to make it run x times faster.
>
> In this case it is spoken voice, but I guess it could by anything else.
>
> Best,
>
> João
>
> Hi João,
>
> A measure that would give something near 1.0 for white noise and near 0
> for a sine wave would be "spectral flatness", which is in the timbreID
> library. But if you're looking to see how well a spectrum's partials line
> up harmonically, you won't find that in timbreID yet. One quick option
> would be to use sigmund~ to get the current pitch, then search the spectrum
> for the amount of energy in bin ranges related to the expected set of
> harmonics. Compare that with energy in non-harmonic bins. But then, for
> things like gongs that sound "pitchy" but have inharmonic spectra, that
> won't be much help. Depends a lot on what you're trying to do.
>
> You *might* find specSpread~ useful, which measures how widely or tightly
> energy is concentrated around the spectrum's center of gravity. It's in
> units of Hz though.
>
>
>
> On Thu, Jan 2, 2014 at 12:38 PM, João Pais <jmmmpais at googlemail.com>wrote:
>
> Hello,
>
> I wanted to ask if there are any suggestions for spectral "weight"
> analysis.
> With "weight" I mean a factor which would measure the harmonicity of a
> sound - e.g. white noise being 1, and a sinus/silence 0. Surely it exists a
> propper word for this already, but I don't know one.
>
> Is there any external or patch around that does something similar?
>
> Thanks,
>
> jmmmp
>
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> www.williambrent.com
>
> “Great minds flock together”
> Conflations: conversational idiom for the 21st century
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-- 
William Brent
www.williambrent.com

“Great minds flock together”
Conflations: conversational idiom for the 21st century

www.conflations.com
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