Editing Periodogram (section)

{{Short description|Estimate of the spectral density of a signal}}
In [[signal processing]], a '''periodogram''' is an estimate of the [[spectral density]] of a signal. The term was coined by [[Arthur Schuster]] in 1898.<ref name="Schuster"/> Today, the periodogram is a component of more sophisticated methods (see [[spectral estimation]]).  It is the most common tool for examining the amplitude vs frequency characteristics of [[FIR filter]]s and [[window functions]].  [[spectrum analyzer|FFT spectrum analyzers]] are also implemented as a time-sequence of periodograms.