# Discrete Time Fourier Transform

The discrete-time Fourier transform (DTFTX(ejÏ‰) of a discrete-time signal x(n) is expressed as

X(ejÏ‰) =

or DTFT x(n) = X(ejÏ‰)

And Inverse Discrete-Time Fourier Transform (IDTFT) is expressed as

x(n) =

or IDTFT X(ejÏ‰) = x(n)

Table: Properties of Discrete-time Fourier Transform