December 2005
Intermediate to advanced
475 pages
12h 6m
English
Content preview from Signals and Systems
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6.15 z-TRANSFORM OF an cos(nω)u(n)
Let x1(n) = cos (nω)u(n). Now we can write
| The given expression is | x(n) = ancos (nω)u(n) = anx1(n) |
| ∴ | X(z) = Z[anx1(n)] |
Using scaling property, we can write
Hence, the obtained z-transformation pair is
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