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{{Mergefrom|Waterfall_plot|date=January 2007}}
[[Image:Spectrogram_of_violin.png|thumb|300px|A spectrogram of [[media:Violin for spectrogram.ogg|violin playing]] with linear frequency on the vertical axis and time on the horizontal axis. The bright lines show how the spectral components change over time. The intensity coloring is logarithmic (black is −120 [[dBFS]]).]]
The '''spectrogram''' is the result of calculating the [[frequency spectrum]] of [[windowed frame]]s of a compound [[signal (information theory)|signal]]. It is a three-dimensional plot of the energy of the frequency content of a signal as it changes over time.
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