منابع مشابه
Frames in rotated time-frequency planes
Weyl-Heisenberg frames are complete signal representations corresponding to rectangular tiling of the time-frequency plane. Extensions of these frames are obtained in the rotated time-frequency planes by using the fractional Fourier transformation. It is shown that rotation does not affect the frame bounds. For some specific angles, lattices in rotated coordinates will map to the lattices in th...
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In many pattern recognition applications, features are traditionally extracted from standard time–frequency representations (TFRs). This assumes that the implicit smoothing of, say, a spectrogram is appropriate for the classification task. Making such assumptions may degrade classification performance. In general, any time–frequency classification technique that uses a singular quadratic TFR (e...
متن کاملRegionally optimised kernels for time-frequency distributions
Ideally, kernels used to generate bilinear time-frequency distributions (TFD) should be signal-dependent, and optimised independently at every location in the time-frequency (TF) plane. This poses an extremely severe computational burden. A compromise is proposed in this paper: time-varying kernels are optimised for specific regions in the time-frequency plane. The regions, designed to isolate ...
متن کاملOptimal phase kernels for time-frequency analysis
We consider the design of kernels for time-frequency distributions through the phase, rather than amplitude, response. While phase kernels do not attenuate troublesome crosscomponents, they can translate them in the time-frequency plane. In contrast to previous work on phase kernels that concentrated on placing the cross-components on top of the auto-components, we set up a “don’t care” region ...
متن کاملOptimal kernels for time-frequency analysis
Current bilinear time-frequency representations apply a fixed kernel to smooth the Wigner distribution. However, the choice of a fixed kernel limits the class ofsignals that can be analyzed effectively. This paper presents optimality criteria for the design of signal-dependeni kernels that suppress cross-components while passing as much auto-component energy as possible, irrespective of the for...
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ژورنال
عنوان ژورنال: IEEE Signal Processing Letters
سال: 2002
ISSN: 1070-9908,1558-2361
DOI: 10.1109/lsp.2002.805118