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To calculate the spectrogram using the magnitude of the STFT is usually a [[digital (signal)|digital]] process. Digitally [[sample (signal)|sample]]d data, in the time ___domain, is broken up into chunks, which usually overlap, and Fourier transformed to calculate the magnitude of the frequency spectrum for each chunk. Each chunk then corresponds to a vertical line in the image; a measurement of magnitude versus frequency for a specific moment in time.
The spectrums or time plots are then "laid side by side" to form the image or
The spectrogram is given by the [[Magnitude (mathematics)|magnitude]] of the STFT of the function:
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