I have been doing some research on objective sound metrics used to classify the quality of a sound signal. According to my research, the most usually used are loudness and sharpness ( definitions can be found here )
I have encountered a fair amount of literature on the matter, and i am familiar with the way these metrics are calculated ( loudness is strictly defined by national and international standards, and sharpness according to DIN 45692 ).
This analysis though takes place in the frequency domain, and all of the plots i see use as the x-axis the so called critical band rates ( info on critical bands here )
My question: I also encounter some plots though that show the evolving of the phenomena with respect to time. My guess is that researchers break the original time signal to parts, and do analysis on these parts to create these kind of plots. As the definition of these metrics does not explicitly depend on time, i cannot be sure of how they derive that. Am i missing something here? Is there another way to deal with this on the time domain?