Two-Channel Orthogonal Filter BanksA program for the design of a lowpass (scaling) FIR filter for a orthogonal two-channel filter bank (wavelet system). The filter has a specified ripple size and a specified degree of flatness. The filters produced by this program achieve a trade-off between the classical Herrmann (Daubechies) filter and an equi-ripple solution. This permits a trade-off between frequency selectivity and the number of vanishing moments.
- Example
- Documentation
- Download Matlab programs as a single tar file
- Matlab programs listed separately
- fir_orthog.m - main program
- choose.m - binomial coefficients
- local_max.m - local maxima
- oref.m - refinement of extremals
- polydiff.m - polynomial differentiation
- h2mag.m - magnitude response
Please direct comments and questions to I. W. Selesnick (selesi@ece.rice.edu).
For more details see: M. Lang, I. Selesnick, J. E. Odegard, C. S. Burrus, Constrained FIR Filter Design for 2-band Filter Banks and Orthonormal Wavelets, Presented at the 6th IEEE DSP Workshop, Oct 1994, Also a Rice University ECE technical report. [4 pages, 58KB] Abstract.