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Spectrogram
Visual representation of the spectrum of frequencies of a signal as it varies with time / From Wikipedia, the free encyclopedia
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A spectrogram is a visual representation of the spectrum of frequencies of a signal as it varies with time. When applied to an audio signal, spectrograms are sometimes called sonographs, voiceprints, or voicegrams. When the data are represented in a 3D plot they may be called waterfall displays.
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Spectrograms are used extensively in the fields of music, linguistics, sonar, radar, speech processing,[1] seismology, ornithology, and others. Spectrograms of audio can be used to identify spoken words phonetically, and to analyse the various calls of animals.
A spectrogram can be generated by an optical spectrometer, a bank of band-pass filters, by Fourier transform or by a wavelet transform (in which case it is also known as a scaleogram or scalogram).[2]
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A spectrogram is usually depicted as a heat map, i.e., as an image with the intensity shown by varying the colour or brightness.