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The spectrogram is a member of Cohen's class. It is a smoothed Wigner–Ville distribution with the smoothing kernel equal to the Wigner–Ville distribution of the analysis window. The method of reassignment smooths the Wigner–Ville distribution, but then refocuses the distribution back to the true regions of support of the signal components. The method has been shown to reduce time and frequency smearing of any member of Cohen's class
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{{cite journal |author1=F. Auger |author2=P. Flandrin |name-list-style=amp |date=May 1995 |title=Improving the readability of time-frequency and time-scale representations by the reassignment method |journal=IEEE Transactions on Signal Processing |volume=43 |issue=5 |pages=1068–1089 |doi=10.1109/78.382394 |bibcode=1995ITSP...43.1068A |citeseerx=10.1.1.646.794 |s2cid=6336685 }}
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.<ref>P. Flandrin, F. Auger, and E. Chassande-Mottin,
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