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The STFT is a mapping from a onedimensional function (the domain, which is a function of time) to a twodimensional function (the range, which is a function of time and frequency). Now suppose, rather than holding constant (4), we also allow it to be a parameter. The new mapping we so obtain is a mapping from the onedimensional domain (time) to a threedimensional range (time, frequency, and logscale) that we previously referred to as the TFS parameter space (Fig. 1(a)).