And As the spectrum of the discrete time sign, this exact spectrum will periodically repeat if we prolonged the frequency better over and above $f_s$ this sort of which the spectrum shown can be a similar spectrum in just about every frequency band from $nf_s$ to $(n+1)f_s$ for virtually any https://share.evernote.com/note/91c6354d-2887-12d0-6d41-1b26614dcfdf