A Reassignment Method for Improved Readability of Time-Frequency Representations
نویسندگان
چکیده
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. key words: signal analysis, time-frequency representation, re-
منابع مشابه
Analysis of Low Probability of Intercept Radar Signals Using the Reassignment Method
Corresponding Author: Daniel L. Stevens Air Force Research Laboratory, Rome, NY 13441, United States Email: [email protected] Abstract: Digital intercept receivers are currently moving towards classical time-frequency analysis techniques for analyzing low probability of intercept radar signals. Although these techniques are an improvement over existing Fourier-based techniques, they st...
متن کاملImproving the readability of time-frequency and time-scale representations by the reassignment method
Abstruct-In this paper, the use of the reassignment method, first applied 15 years ago by Kodera, Gendrin, and de Villedary to the spectrogram, is generalized to any bilinear time-frequency or time-scale distribution. This method creates a modified version of a representation by moving its values away from where they are computed, so as to produce a better localization of the signal components....
متن کاملA simple scheme for enhanced reassignment of the smoothed pseudo Wigner-Ville representation of noisy signals
The reassignment procedure has been often 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 coeff...
متن کاملImproving harmonic selection for speech intelligibility enhancement by the reassignment method
Harmonic selection is a useful mechanism for speech enhancement. However, there is difficulty in detecting harmonic structure in the spectrum in the presence of noise or interfering speech. In this paper we address the problem of applying the reassignment method to produce a higher-resolution spectrum for improving the harmonic selection. The reassignment method is to assign the value of the sp...
متن کاملJoint recursive implementation of time - frequency representations and their modified version by the reassignment method
Cohen's class time-frequency distributions (CTFDs) have significant potential for the analysis of non-stationary signals, even if the poor readability of their representations makes visual interpretations difficult. To concentrate signal components, Auger and Flandrin recently generalized the reassignment method (first applied to the spectrogram in the 1970s) to any bilinear representations. Un...
متن کامل