The reassignment procedure has often been employed to improve readability of some time-frequency representations (TFRs). When processing noisy signals, the problem of sensitivity of the technique to noise is encountered. In this paper, a simple modification of reassignment method is proposed, based on thresholding operation. Specifically, by preventing the reassignment of the distribution coefficients below the noise dependent threshold and replacing them with zeros, the enhanced signatures on the time-frequency plane are obtained. This method is compared with other techniques, such as the reassigned spectrogram (RSP) and the supervised reassigned spectrogram (SRSP). An experimental test of these algorithms as the instantaneous frequency (IF) estimators for a chirp signal have shown that our method improves the accuracy of the estimation for heavy noise.
|Translated title of the contribution||A simple scheme for enhanced reassignment of the SPWV representation of noisy signals|
|Title of host publication||3rd International Symposium on Image and Signal Processing and Analysis (ISPA 2004) Rome, Italy|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||630 - 633|
|Number of pages||4|
|Publication status||Published - Sep 2003|
|Event||3rd International Symposium on Image and Signal Processing and Analysis, 2003 - Rome, Italy|
Duration: 18 Sep 2003 → 20 Sep 2003
|Conference||3rd International Symposium on Image and Signal Processing and Analysis, 2003|
|Period||18/09/03 → 20/09/03|
Bibliographical noteRose publication type: Conference contribution
Sponsorship: This work is supported by AMS UK
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