spectrogram

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spec·tro·gram

(spek'trō-gram),
A graphic representation of a spectrum.
[spectro- + G. gramma, something written]
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An envelope of quasimonochromatic signal has often several local maxima, forming several ridges in spectograms obtained by frequency-time analyses.
On the spectograms the contrast was very clear.(6) The second formant for /r/ rose with a constant slope to the gap, after which it fell along the same steady slope.