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Group Delay Measurement Setup
The concept behind this Group Delay measurement setup is to AM modulate a sweep frequency carrier with a very low frequency <20Hz sinewave. 

The resulting envelope is a Time dependent series, the phase of which will only change due to Real Time Delay. 

This approach is unlike using a single Sideband Suppressed Carrier (SSBSC) signal, the phase of which is susceptible to ambiguity.
 

Amplitude & Group Delay Plots for Band Pass Filter
----Bandpass Filter Amplitude: RED
----Group Delay: Green-
groupdelay
 
-Mouse-Over image to see Animation-
 
Depiction of Group Delay in a Band Pass Filter--
 


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