Cho X ( e j ω ) = { 1 [ − ω c 2 ≤ ω ≤ − ω c 1 ω c 1 ≤ ω ≤ &#x03C9

$\text{x}\left(\text{n}\right)=\frac{\text{c}\text{o}\text{s}\omega {}_{c2}n-\text{c}\text{o}\text{s}\omega {}_{c1}n}{n\pi }$

$\text{x}\left(\text{n}\right)=\delta \left(n\right)-\frac{\text{c}\text{o}\text{s}\omega {}_{cl}n}{n\pi }$

$\text{x}\left(\text{n}\right)=\frac{\text{s}\text{i}\text{n}\omega {}_{c2}n-\text{s}\text{i}\text{n}\omega {}_{c1}n}{n\pi }$

$\text{x}\left(\text{n}\right)=\delta \left(n\right)-\frac{\text{s}\text{i}\text{n}\omega {}_{c\text{c}}n}{n\pi }$