Results 121 to 130 of about 19,683 (177)
Digital signal implementation of the discrete Wigner distribution function
Canadian Electrical Engineering Journal, 1985 A computationally efficient representation of the discrete Wigner distribution function is suggested. It allows the investigation of the spectral properties of a real analytic signal to be performed and the possibility of its recovery from the distribution. A 2-D discrete representation is also introduced with special applications to image processing.
R. N. Gorgui-Naguib +2 more
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Alias-free Smoothed Wigner Distribution Function For Discrete-time Samples
OCEANS 91 Proceedings, 1991 Abstract : An alias-free Wigner distribution function (WDF), for a time waveform s(t) limited to total frequency extent F, is available if the time sampling increment delta is less than 1/F. Furthermore, the WDF can be efficiently numerically evaluated via fast Fourier transform (FFT) procedures if the FFT size N is greater than 2T/delta, where T is ...
Albert H. Nuttall
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Efficient computation of the discrete Wigner-Ville distribution
IEEE International Symposium on Circuits and Systems, 2002 To ensure that the discrete Wigner-Ville distribution (DWVD) does not contain aliasing terms, the analytic signal is normally used instead of the real signal. However, the computation of the analytic signal amounts to most of the computation time.
null Shing-Chow Chan, null Ka-Leung Ho
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Roundoff error analysis of the discrete Wigner distribution using fixed-point arithmetic
IEEE Transactions on Signal Processing, 1991 The issue of roundoff noise effects in the implementation of the discrete Wigner distribution using fixed-point arithmetic is addressed. The sign-magnitude number representation is assumed throughout the analysis. The measure of roundoff noise effects in an algorithm is the output noise-to-signal ratio.
C. Griffin, P. Rao, F.J. Taylor
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Synthesis of discrete-time discrete-frequency Wigner distribution
IEEE Signal Processing Letters, 2003 A recursive algorithm is proposed for synthesizing a discrete-time periodic signal from a specified discrete-time discrete-frequency Wigner distribution by minimizing the error in the cyclic outer product. Equating the gradient of the error with respect to signal samples to zero results in a set of nonlinear simultaneous equations, which are solved ...
S.R. Nelatury, B.G. Mobasseri
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Fixed-point error analysis of discrete Wigner-Ville distribution
IEEE Transactions on Signal Processing, 1997 The Wigner-Ville distribution (WVD) has been a powerful signal processing tool for time-frequency signal analysis. Consequently, many algorithms have been proposed in the literature for computing the WVD in real-time applications. However, Boashash (1987) has proposed and showed that the evaluation of the analytic signal using the time-domain approach,
K.M.M. Prabhu, R. Shanmuga Sundaram
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The aliasing problem in discrete-time Wigner distributions
IEEE Transactions on Acoustics, Speech, and Signal Processing, 1983 The Wigner distribution (WD) is a bilinear mapping that, with some restrictions, can be interpreted as the energy distribution of a signal over time and frequency. This makes the WD useful in signal analysis, but its actual use requires a discrete-time version. It is shown that the bilinear nature of such a discrete time WD causes aliasing problems. It
Claasen, Theo A. C. M. +1 more
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On the existence of discrete Wigner distributions
IEEE Signal Processing Letters, 1999 Among the myriad of time-frequency distributions, the Wigner distribution stands alone in satisfying many desirable mathematical properties. Attempts to extend definitions of the Wigner distribution to discrete signals have not been completely successful.
J.C. O'Neill, P. Flandrin, W.J. Williams
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Elimination of cross-components of the discrete Wigner-Ville distribution via a correlation method
Proceedings of Third International Conference on Signal Processing (ICSP'96), 2002 This paper presents a method to remove cross-components produced by the discrete Wigner-Ville distribution (WVD). The procedure consists of considering the WVD as an image and assigning each pixel to either an auto-component or a cross-component according to a correlation coefficient. This coefficient measures the correlation between the time-frequency
Grall-Maës, Edith, Beauseroy, Pierre
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IEEE Transactions on Acoustics, Speech, and Signal Processing, 1986 Various discrete definitions of the Wigner distribution (WD) for discrete-time signals have been proposed in previous works. The formulation developed in this paper leads to natural and unified definitions of discrete versions of the WD. They are directly related to the continuous and preserve most of its properties.
F. Peyrin, R. Prost
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