## 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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Fourier Series Special Case

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Frequencies in the ``Cracks''