And As the spectrum of a discrete time signal, this same spectrum will periodically repeat if we prolonged the frequency higher over and above $f_s$ such that the spectrum shown is also the same spectrum in each and every frequency band from $nf_s$ to $(n+one)f_s$ for virtually any integer $n$. https://boyspggurugramsector15part1.blogspot.com/2025/07/find-ideal-boys-pg-in-gurgaon-sector-15.html