[PD] Question on [signmund~] tracks with 0 amplitude

Miller Puckette msp at ucsd.edu
Sun Apr 12 04:07:17 CEST 2020


It's possible to have nothing in a track - in that case, the flag (the 4th
item in the list sigmund~ outputs) should be -1.

If that flag is saying there's a sinusoid of amplitude zero, something's
wrong with sigmund~.

cheers
Miller

On Fri, Apr 10, 2020 at 11:29:35PM +0200, Jo??o Pais wrote:
> Hello list,
> 
> I'm trying out [sigmund~], and wanted to confirm something related to
> results I'm getting. When using the patch
> doc/4.data.structures/14.partialtracer (and also a derivate patch of mine),
> I get lots of tracks with 0 amplitude as result of the analysis.
> The settings are [sigmund~ -t -npts 1024 -npeak 40 -maxfreq 8000 peaks
> tracks] in the help file, and [sigmund~ -t -npts 2048 -npeak 200 tracks] in
> my patch.
> 
> When comparing the result of the analysis with a spectrogram of the sample,
> the frequency content does match - the tracks with 0 amplitude don't exist
> in the sample, i.e. they're silence.
> 
> My doubt is, is it normal to have tracks with 0 amplitude? Or is there
> something wrong with the analysis settings?
> (if these tracks are a derivative of [sigmund~], that's fine, I can filter
> and delete them afterwards)
> 
> Best,
> 
> jmmmp

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