I have started off with GNUradio and I am not sure if I understand the transition width parameter available in GNU radio companion filter blocks .
As per online documentation transition width of a digital filter is the frequency difference between the cutoff frequency of the passband and the start frequency of the stop band.
What does the stop band mean? Does it have an analogue for Analog filters?
I suspect that the stop band is a concept specific to digital filters and does not have an Analog equivalent. If this is the case, then what is the origin for this difference between Analog and digital filters?