1
CT signal: $ x(t)=cos(t) $
DT periodic signal: $ x[n]=cos[2\pi n] $
DT non-periodic signal: $ x[n]=cos[\frac{1}{2\pi}n] $
2
Non-Periodic Equation: $ x[n]=e^{-0.5n}cos[5n] $
Periodic Equation: $ y[n]=\sum_{k=0}^{\infty}e^{-0.5(n-kN)}cos[5(n-kN)] $
