DocumentCode :
2466182
Title :
An algorithm for positive time-frequency distributions
Author :
Sang, Tzu-Hsien ; Williams, W.J. ; O´Neill, J.C.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
fYear :
1996
fDate :
18-21 Jun 1996
Firstpage :
165
Lastpage :
168
Abstract :
The time-frequency distributions (TFDs) of Cohen´s class provide a method for high-resolution representation of time-varying signals. This benefit does not come without cost; the most noticeable is the existence of negative values in most desirable fixed-kernel TFDs. We examine the relation between the negative values and several aspects of TFDs, such as cross terms and marginal properties. We suggest that it may be advantageous to obtain positive TFDs which at the same time satisfy the marginal properties. A post-processing algorithm is developed to modify any existing TFD to provide a corresponding positive TFD. It is demonstrated in computer experiments that the high resolution property is preserved quite well
Keywords :
signal representation; signal resolution; time-frequency analysis; Cohen´s class; computer experiments; cross terms; fixed-kernel TFDs; high resolution property; high-resolution representation; marginal properties; positive time-frequency distributions; post-processing algorithm; time-varying signals; Costs; Density functional theory; Energy resolution; Postal services; Probability density function; Signal analysis; Signal processing; Signal resolution; Spectrogram; Time frequency analysis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Time-Frequency and Time-Scale Analysis, 1996., Proceedings of the IEEE-SP International Symposium on
Conference_Location :
Paris
Print_ISBN :
0-7803-3512-0
Type :
conf
DOI :
10.1109/TFSA.1996.547207
Filename :
547207
Link To Document :
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