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==Uses==
* The results of [[spectral density estimation]], showing the spectrum of the signal at successive intervals of time.
* The [[Latency (audio)|delayed response]] from a [[loudspeaker]] or [[listening room]] produced by [[impulse response]] testing or [[MLSSA]].
* Spectra at different engine speeds when testing engines.
[[Image:Aaronia Spectrum Analyzer Software.jpg|thumb|The upper half of this diagram shows the frequency spectrum of a modern [[Switched-mode power supply|switching power supply]] which employs [[spread spectrum]]. The lower half is a waterfall plot showing the variation of the frequency spectrum over time during the power supply's heating up period.]]
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