A Reassignment Method for Improved Readability of Time-Frequency Representations

Pavol ZAVARSKY  Nobuo FUJII  Masahiro IWAHASHI  Noriyoshi KAMBAYASHI  Shinji FUKUMA  Takeshi MYOKEN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E83-A   No.7   pp.1473-1478
Publication Date: 2000/07/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Analog Signal Processing
signal analysis,  time-frequency representation,  reassignment method,  

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A simple but efficient method to improve readability of discrete pseudo time-frequency representations (TFRs) of nonstationary signals by the reassignment of the representations in discrete frequency dimension is presented. The method does not rely on the nonzero time derivative of the window function employed in the estimation of pseudo TFR. This property of the reassignment method is advantageous because the method can provide an improved readability in the situation when a known reassignment method is unefficient. The reassignment of the TFRs of corrupted signals is discussed. Numerical examples are included to illustrate the performance of the proposed method.