And because the spectrum of the discrete time signal, this same spectrum will periodically repeat if we extended the frequency greater over and above $f_s$ these kinds of which the spectrum demonstrated is also exactly the same spectrum in every frequency band from $nf_s$ to $(n+one)f_s$ for almost any integer https://pginsector15gurugram.news.blog/2025/07/28/book-modern-pg-for-boys-in-gurgaon-osmstays/