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On rotated time-frequency kernels

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3 Author(s)
Bastiaans, M.J. ; Faculteit Elektrotechniek, Technische Universiteit Eindhoven, Netherlands ; Alieva, T. ; Stankovic, L.

The principal axes of the time-frequency representation of a signal are defined as those mutually orthogonal directions in the time-frequency plane for which the width of the signal's fractional power spectrum is minimum or maximum. The time-frequency kernels used in the Cohen class of time-frequency representations are then rotated in the time-frequency plane, in order to align the kernels' preferred axes to the signal's principal axes. It is shown that the resulting time-frequency representations show a better reduction of cross-terms without too severely degrading the autoterms than the corresponding original time-frequency representations.

Published in:

Signal Processing Letters, IEEE  (Volume:9 ,  Issue: 11 )