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An information-theoretic approach to positive time-frequency distributions

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3 Author(s)
Loughlin, P.J. ; Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA ; Pitton, J.W. ; Atlas, L.E.

The principle of minimum cross entropy (MCE) is used to generate positive distributions in the Cohen-Posch (1985) class of proper time-frequency distributions (TFDs). The MCE-TFDs are not only intuitively satisfying, but they also yield the correct marginals, have strong finite support, and are everywhere nonnegative. The usual cross-term artifacts that hinder interpretation of other time-frequency representations (most notably, the Wigner-Ville) are not a problem with the MCE-TFDs. Examples of speech and chirps are given and compared to the spectrogram. An interesting observation in the case of speech is that spectrograms more closely resemble time-conditional-frequency distributions (narrowband) or frequency-conditional-time distributions (wideband) than they do joint time-frequency distributions

Published in:
Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on  (Volume:5 )

Date of Conference: 23-26 Mar 1992

Page(s):
125 - 128 vol.5
Meeting Date :
23 Mar 1992-26 Mar 1992
ISSN :
1520-6149
Print ISBN:
0-7803-0532-9
INSPEC Accession Number:
4459701
Conference Location :
San Francisco, CA
Digital Object Identifier :
10.1109/ICASSP.1992.226642
Product Type:
Conference Publications

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