Wavelets and Filter Banks
Description: Study of wavelet concepts. Use wavelet-based filter banks
to process signals.
Textbook: G. Strang and T. Nguyen, Wavelets and Filter Banks, Wellesley-
Cambridge Press, MA, 1996.
Chapter Topic
1 Introduction: Overview and notation.
2 Filters: Sampling, time-invariance, ideal filters, Fourier
analysis, bases and frames; time, frequency, and scaling.
3 Downscaling and Unscaling: Matrices, subsampling in
frequency domain, z-domain; sampling interchange.
4 Filter Banks: Perfect reconstruction, polyphase matrix,
efficient filter banks, upsampling and reconstruction,
lattice structure.
5 Orthogonal Filter Banks: Paraunity matrices, orthonormal
filter banks, halfband filters, spectral factorizaiton,
Daubechies filters.
6 Multiresolution: Wavelets from filters, scaling function by
recursion, infinite product formula, biorthogonal wavelets.
7 Wavelet Theory: Accuracy, cascaade algorithm, smoothness,
splines and semiorthogonal wavelets, multifilters and wavelets.
8 Finite Length Signals: Circular convolution, symmetric
extension, cosine bases and DCT, smooth local cosine bases,
boundary filters and wavelets.
9 M-Channel Filter Banks: Freedom versus structure, polyphase
form, perfect reconstruction, cosine-modulated filter banks,
multidimensional filters and wavelets.
10 Design Methods: Distortions, general perspective, perfect
reconstruction, two-channel filter banks, cosine-modulated
filter banks.
11 Applications: Fingerprints, image and video compression;
speech, audio, and ECG compression; shrinkage, denoising,
and feature detection; communcation applications, wavelet
integrals for differential equations.
Project: Design, analyze, and test wavelet and filter algorithms to
characterize standard library signals.
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