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The '''method of reassignment''' is a technique for sharpening a [[time-frequency representation]] by mapping the data to time-frequency coordinates that are nearer to the true [[Support (mathematics)|region of support]] of the analyzed signal. The method has been independently introduced by several parties under various names, including ''method of reassignment'', ''remapping'', ''time-frequency reassignment'', and ''modified moving-window method''.<ref name="hainsworth">{{Cite thesis |type=PhD |chapter=Chapter 3: Reassignment methods |title=Techniques for the Automated Analysis of Musical Audio |last=Hainsworth |first=Stephen |year=2003 |publisher=University of Cambridge |citeseerx=10.1.1.5.9579 }}</ref> In
the case of the [[spectrogram]] or the [[short-time Fourier transform]], the method of reassignment sharpens blurry time-frequency data by relocating the data according to local estimates of instantaneous frequency and group delay. This mapping to reassigned time-frequency coordinates is very precise for signals that are separable in time and frequency with respect to the analysis window.
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