Time-frequency representations of experimental acoustic signals, a comparative study

This paper aims to discuss the performance of Choi-Williams and Wigner-Ville time-frequency representations, by comparing their ability to analyze experimentally acoustic signals backscattered by air filled thin Copper and Aluminum tubes, immersed in water. Choi-Williams and Wigner-Ville time-frequency images are compared to the Short time Fourier transform. Time-frequency images show that Choi-Williams and Wigner-Ville representations are more efficient in terms of minimizing the amplitude of cross-terms, and producing good time-frequency resolutions. Moreover, reduced cut-off frequencies of some circumferential waves are easily extracted. The results of the literature review reveal that longitudinal and transversal velocities values of Copper and Aluminum are estimated with better accuracy.