Choi-Williams time-frequency representation of acoustic signals
Résumé
This work concerns the study of acoustic signals that are backscattered by thin aluminum tubes. This study is done with the help of Choi-Williams time-frequency method by virtue of its interesting properties. This technique was chosen because it reduces the amplitude of the interferences. This can make the interpretation of time-frequency image easier. However, the resolution of time-frequency image is acceptable if the involved parameter is well chosen. As a result, the determination of longitudinal and transverse velocities of aluminum from Choi-Williams time-frequency technique reveals a good agreement with the theoretical method of proper modes as mentioned in scientific literature.
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