[sdiy] Roughness vs Frequency?

[cheater cheater]

That's pretty nice. I wonder if there's a really optimized FFT
approach in there somewhere.

On Sun, Feb 5, 2023 at 3:16 AM Magnus Danielson via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> Hi,
>
> On 2023-01-29 07:37, cheater cheater via Synth-diy wrote:
> > Is it possible to define roughness so that a sound can be said to have
> > a specific amount of roughness at a specific frequency? It appears to
> > me that some sounds seem to sound "rough" at high frequency parts of
> > their spectrum and other sounds at low frequency parts, or others yet
> > at mid freq parts.
> >
> > Maybe a spectral envelope of roughness vs frequency could be produced
> > (kind of like level vs frequency which is just the normal audio
> > spectrum of a sound)
>
> Turns out that there exists standards and measures for this.
>
> One place to check out is:
>
> https://community.sw.siemens.com/s/article/sound-modulation-metrics-fluctuation-strength-and-roughness
>
> This brings us into modulation and strength of modulation within a
> particular frequency range.
>
> You can AM and PM detect signal and analyze their spectrum. AM is the
> simplest. Some suitable filtering and a level detector and you can
> adjust levels to match up with a particular scale for roughness. Seems
> doable.
>
> PM/FM detection can naturally also be done and similar processing.
>
> Cheers,
> Magnus
>
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