And because the spectrum of a discrete time signal, this same spectrum will periodically repeat if we extended the frequency larger further than $f_s$ such the spectrum proven can be the identical spectrum in each frequency band from $nf_s$ to $(n+1)f_s$ for any integer $n$. While in the first-class he https://boyspginsector15gurgaon.blogspot.com/2025/07/well-maintained-boys-pg-in-gurgaon.html