More information on 'Adjust RTA Levels' option in RTA Tool

[tcoor8325]

Hi, I would like some clarity on the math going on with the toggleable 'Adjust RTA Levels' under RTA->Show the Graph Controls->Appearance

I understand that as I decrease the width of the bands, the amount of energy in each band goes down, and so the overall level of the bands decrease.

The Adjust RTA Levels option offsets the levels shown on the RTA plot to compensate for both the
bandwidth variation as resolution is changed and the difference between a sweep measurement at a given
sweep level and a pink PN RTA measurement at the same level, allowing direct comparison between RTA
and sweep plots.

I'm more concerned about the 2nd part, the difference between a sweep measurement at a given sweep level and a pink PN RTA measurement at the same level
I get that a pink sweep spends less time in higher frequencies and will therefore put less energy in higher bands, but how would the pink noise be different, energy wise, and how is this calculated?

Thanks!

 

[John Mulcahy]

The adjustment is just 10*log10(octave fraction) and a constant offset.