Choi-Williams time-frequency representation of acoustic signals

Abdelkader Elhanaoui , El Houcein Aassif , Gerard Maze (1)

1 LOMC - Laboratoire Ondes et Milieux Complexes

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.

Mots clés: Thin aluminum tubes; acoustic signals; time-frequency representations; Choi-Williams

Domaines: Acoustique [physics.class-ph]

Abdelkader Elhanaoui, El Houcein Aassif, Gerard Maze. Choi-Williams time-frequency representation of acoustic signals. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810948⟩