Title: Cross-correlation function combined with wavelet transform for acoustic holography scanning measurement
Authors: Gee-Pinn James Too, Bo-Hsien Wu
Addresses: Department of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan, Taiwan. ' Department of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan, Taiwan
Abstract: The Similar Source Method (SSM) has been developed to describe interior and exterior sound fields. In this study, a new method for revising phase in the scanning measurement of acoustical holography is developed by using wavelet transform to filter out the noise first. Then, a cross-correlation function is used to calculate the delay time of signals for each signal. Furthermore, the delay time is used to revise the phase of the signal. Finally, a modified version of the SSM is developed to describe the sound pressure distribution in a planar surface. Simulation is shown to verify this approach in this study.
Keywords: SSM; similar source method; cross-correlation function; wavelet transforms; acoustic holography scanning; sound fields; sound pressure distribution; planar surfaces; simulation.
International Journal of Computer Applications in Technology, 2009 Vol.36 No.2, pp.91 - 99
Published online: 13 Aug 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article