1 October 2000 New method for designing two-channel causal stable IIR perfect reconstruction filter banks and wavelet bases
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Optical Engineering, 39(10), (2000). doi:10.1117/1.1288183
Abstract
A new method for designing two-channel causal stable IIR PR filter banks and wavelet bases is proposed. It is based on the structure previously proposed by Phoong et al. (1995). Such a filter bank is parameterized by two functions ?(z) and ?(z), which can be chosen as an all-pass function to obtain IIR filterbanks with very high stopband attenuation. One of the problems with this choice is that a bump of about 4 dB always exists near the transition band of the analysis and synthesis filters. The stopband attenuation of the high-pass analysis filter is also 10 dB lower than that of the low-pass filter. By choosing ?(z) and ?(z) as an all-pass function and a type-II linear-phase finite impulse response (FIR) function, respectively, the bumping can be significantly suppressed. In addition, the stopband attenuation of the high-pass filter can be controlled easily. The design problem is formulated as a polynomial approximation problem and is solved efficiently by the Remez exchange algorithm. The extension of this method to the design of a class of IIR wavelet bases is also considered.
J. S. Mao, S. C. Chan, Ka Leung Ho, "New method for designing two-channel causal stable IIR perfect reconstruction filter banks and wavelet bases," Optical Engineering 39(10), (1 October 2000). http://dx.doi.org/10.1117/1.1288183
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KEYWORDS
Linear filtering

Optical filters

Signal attenuation

Wavelets

Infinite impulse response filters

Finite impulse response filters

Holmium

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