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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.
Spectrograms are used to identify [[phonetics|phonetic]] sounds, to analyse the cries of animals, and in the fields of [[music]], [[sonar]]/[[radar]], [[speech processing]], etc. A spectrogram can also be called a '''spectral waterfall''', '''sonogram''', '''voiceprint''', or '''voicegram'''. The instrument that generates a spectrogram is called a '''sonograph'''.
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