Spectral Bin Numbers
Since the

th spectral sample

is properly regarded as
a measure of spectral amplitude over a
range of frequencies,
nominally

to

, this range is sometimes called a
frequency bin
(as in a ``storage bin'' for spectral energy).
The frequency index

is called the
bin number, and

can be regarded as the total energy in the

th
bin (see §
7.4.9).
Similar remarks apply to samples of any
bandlimited
function; however, the term ``bin'' is only used in the
frequency
domain, even though it could be assigned exactly the same meaning
mathematically in the time domain.

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