And As the spectrum of the discrete time sign, this same spectrum will periodically repeat if we extended the frequency larger further than $f_s$ these kinds of that the spectrum proven can be a similar spectrum in just about every frequency band from $nf_s$ to $(n+1)f_s$ for almost any integer https://www.tumblr.com/pginsector15gurugram/790285487683305472/book-modern-pg-for-boys-in-gurgaon-osmstays?source=share