Spectrum display peak values. Log vs linear
Posted: Wed Jul 08, 2020 8:13 pm
I use the spectrum display frequently (excuse the pun) and like it. However I have noticed something odd in the way it displays peak values.
Have a look at a log sweep vs a linear sweep. You'll see that the peak values of the linear sweep are all the same value across the bandwidth, as they should be. But not on the log sweep. Flat trace up to a point, then falling.
I'm sure there is a calculation reason for this, but it's misleading. The peak values of the log sweep do not actually fall as frequency rises.
White noise, pink noise and brownian noise all display as they should, just not the log sweep.
Have a look at a log sweep vs a linear sweep. You'll see that the peak values of the linear sweep are all the same value across the bandwidth, as they should be. But not on the log sweep. Flat trace up to a point, then falling.
I'm sure there is a calculation reason for this, but it's misleading. The peak values of the log sweep do not actually fall as frequency rises.
White noise, pink noise and brownian noise all display as they should, just not the log sweep.