[sdiy] Roughness vs Frequency?

[cheater cheater]

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)