Reassignment method

The method of reassignment is a technique for sharpening a <a href="/facts/Time-frequency_representation/b3BqBScJ">time-frequency representation</a> (e.g. <a href="/facts/Spectrogram/Jt8zHI0H">spectrogram</a> or the <a href="/facts/Short-time_Fourier_transform/XHo1t2m6">short-time Fourier transform</a>) by mapping the data to time-frequency coordinates that are nearer to the true <a href="/facts/Support_(mathematics)/BTuMGbsb">region of support</a> 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. 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.

Reassignment method open-in-new

Reassignment method