Title :
Hybrid wavelet packet analysis
Author :
Hedges, Robert A.
Author_Institution :
Telecommun. Res. Center, Arizona State Univ., Tempe, AZ, USA
Abstract :
Performance of any transform in a particular application is highly dependent on the basis functions chosen. The choice of quadrature mirror filters (QMF) used in a wavelet packet analysis should be taken into consideration in a compression scheme. The choice of appropriate QMF is not only signal dependent, but scale dependent within a given signal. A generalization, known as hybrid wavelet packet analysis, which includes the choice of optimal QMF at each level of decomposition is explored. Computational results show that optimized hybrid wavelet packet bases provide better compression for a class of signals and indicate methods to develop search strategies to find these optimal bases
Keywords :
data compression; entropy; filtering theory; optimisation; quadrature mirror filters; search problems; wavelet transforms; Shannon entropy; basis functions; compression scheme; hybrid wavelet packet analysis; optimized hybrid wavelet packet bases; quadrature mirror filters; scale dependent QMF; search strategies; signal dependent QMF; Algorithm design and analysis; Discrete wavelet transforms; Educational institutions; Filters; Large-scale systems; Mirrors; Optimization methods; Pulse modulation; Wavelet analysis; Wavelet packets;
Conference_Titel :
Time-Frequency and Time-Scale Analysis, 1998. Proceedings of the IEEE-SP International Symposium on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
0-7803-5073-1
DOI :
10.1109/TFSA.1998.721401
