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DFT
Definition
The
Discrete
Fourier Transform
(DFT)
of a
signal
may be defined by
where `
' means ``is defined as'' or ``equals by definition'', and
The
sampling interval
is also called the
sampling
period
. For a tutorial on sampling continuoustime
signals to obtain non
aliased
discretetime signals, see Appendix
D
.
When all
signal samples
are real, we say
. If they may be complex, we write
. Finally,
means
is any integer.
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