Remember one thing, this is a time, this is time. So, what we are calling given a time
domain input of wave, find out time domain output of response same as given a time
frequency domain input of waves, find out frequency domain input of spectrum. This is
the kind of picture that we are looking at, I will there was a very nice picture in the the
reference that I will give you later on, but I will try to draw it here and see whether it can
be sort of combine, this full thing can be combined in one picture now ok.