And As the spectrum of the discrete time sign, this exact same spectrum will periodically repeat if we prolonged the frequency larger further than $f_s$ these types of the spectrum shown can be precisely the same spectrum in every frequency band from $nf_s$ to $(n+1)f_s$ for virtually any integer $n$. https://girlspgingurugramsector15.blogspot.com/2025/07/book-spacious-boys-pg-in-sector-15-part.html