SIGNAL REPRESENTATION QUALITY ENHANCEMENT BY APPLYING MATHEMATICAL OPERATIONS TO TIME-FREQUENCY DISTRIBUTIONS

Authors

  • Nicoletta Saulig
  • Viktor Sučić
  • Nino Stojković

Abstract

Time-frequency distributions represent an efficient tool in the analyzing and processing of nonstationary signals. Some characteristics of nonstationary signals (such as frequency modulation or the property of multi-components) result in the appearance of undesirable interference terms (cross-terms) which do not exist in an ideal time-frequency representation. In this paper, several mathematical operations are used in order to enhance the quality of time-frequency distributions representation. Mathematical operations applied to the spectrogram have led to an improvement in the concentration of the signal energy about its instantaneous frequency. The multiplication of the Wigner-Ville distribution by the Pseudo Wigner-Ville distribution, on the other hand, is proposed as a method for cross-terms suppression, and its performance is numerically compared to that of the Wigner-Ville distribution masked by the spectrogram.

Author Biographies

Nicoletta Saulig

Faculty of Engineering, University of Rijeka, Rijeka, Croatia

Viktor Sučić

Faculty of Engineering, University of Rijeka, Rijeka, Croatia

Nino Stojković

Faculty of Engineering, University of Rijeka, Rijeka, Croatia

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Published

2009-12-01

Issue

Engineering Review Vol 29. No. 2

Section

Articles

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