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Engineering Review : International journal for publishing of original researches from the aspect of structural analysis, materials and new technologies in the field of mechanical engineering, shipbuilding, fundamental engineering sciences, computer sciences, electrical engin, Vol. 29 No. 2, 2009.

Original scientific paper

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

Nicoletta SAULIG
Victor SUČIĆ
Nino STOJKOVIĆ

Full text: croatian pdf 481 Kb

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Full text: english pdf 481 Kb

page 21-31

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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.

Keywords

spectrogram; Wigner-Ville Distribution; pseudo Wigner-Ville Distribution; multi-component signals

Hrčak ID:

46000

URI

https://hrcak.srce.hr/46000

Publication date:

24.12.2009.

Article data in other languages: croatian

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