This paper develops an improved technique for the design of analysis filters in an M channel maximally decimated FIR perfect reconstruction QMF bank, having a lossless polyphase-component matrix E ( z ) . As in earlier work, the aim is to optimize the parameters characterizing E ( z ) until the sum of the stopband energies of the analysis filters is minimized. There a re four new ingredients in...

This paper presents an analysis of water modeling of steel pouring to study (1) air entrainment and (2) filter effectiveness to remove reoxidation inclusions. In the first part, a review is presented of the physical processes and parameters important in air entrainment in free-surface flows. Then, the use of a water system to model air entrainment in steel pouring is analyzed. Attention is focu...

We describe an efficient variation on the z-buffer algorithm for hidden-surface removal in computer-generated images, which allows to selectively post-filter such images in order to reduce the artifacts due to sub-sampling. With a moderate increase in both the computational cost and the memory needs of the classic z-buffer, we filter only those areas where aliasing is most noticeable and improv...

A systematic approach for the design of Switched Current (SI) ladder filters is described. The specifications of the filter in z-domain are used to obtain continued fraction expansions (CFE). Signal Flow Graphs (SFG) of each row of the expansion is derived and then these SFG are directly transformed into switched current structures (integrators and amplifiers). The SI blocks thus obtained are c...

Two matrix equations, Pascal matrix equation and inverse Pascal matrix, are derived and demonstrated in this work. These matrix equations are used for making a conversion and inversion between the coefficients of an analog low pass filter transfer function H(s) and a digital transfer function H(z). The involving of the Pascal’s triangle in both matrix equations is helpful, easier to transform b...

The first two papers in this series reviewed the basic is used to derive the z-transforms of the filters from their concepts which apply to digital filter theory and presented s-plane continuous time descriptions. Recurrence relationdesign techniques based on the z plane pole-zero plot. In ships which may be used to implement filters of van’ous this paper these methods are used to develop digit...

We describe an efficient variation on the z-buffer algorithm for hidden-surface removal in computer-generated images, which allows to selectively post-filter such images in order to reduce the artifacts due to sub-sampling. With a moderate increase in both the computational cost and the memory needs of the classic z-buffer, we filter only those areas where aliasing is most noticeable and improv...

Efficient iterative methods are described for designing orthogonal and biorthogonal two-channel perfect-reconstruction FIR filter banks in such a way that for the analysis and the synthesis lowpass filter the number of zeros at z = −1 are fixed and the energies in the given filter stopband regions are minimized. The regularity of the analysis and the synthesis filter banks resulting when using ...

A simple, cost-effective and switchable five-wavelength fiber ring laser based on a chirped moiré fiber grating (CMFG) and a wavelengthtunable Sagnac loop interferometer (FSI) filter is proposed and experimentally demonstrated. To serve as wavelength selective element, the CMFG possesses excellent comb-like filtering characteristics, and its fabrication method is easy and flexible. The usage of...