On rotated time-frequency kernels

M.J. Bastiaans, T. Alieva, L. Stankovic

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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 auto-terms than the corresponding, original time-frequency representations.
Original languageEnglish
Pages (from-to)378-381
Number of pages4
JournalIEEE Signal Processing Letters
Issue number11
Publication statusPublished - 2002


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