Let
, denote an
-sample complex sequence,
*i.e.*,
. Then the *spectrum* of
is defined by the
*Discrete Fourier Transform (DFT)*:

The

In this chapter, we will omit mention of an explicit sampling interval , as this is most typical in the digital signal processing literature. It is often said that the sampling frequency is . In this case, a radian frequency is in units of ``radians per sample.'' Elsewhere in this book, usually means ``radians per

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