We explore how an ontology may be used with a database to support reasoning about the “information content” of data whereby to reveal hidden information that would otherwise not derivable by using conventional database query languages. Our basic ideas rest with “ontology” and the notions of “information content”. A public ontology, if available, would be the best choice for reliable domain know...

Signal processing engineers recognize two main classes of filter: finite impulse response (FIR) and infinite (IIR), each with distinct properties. The Prism is a new filter type that combines the best both: numerical stability linear phase FIR together low-cost calculation IIR. Here, we show how to build ultranarrowband filters containing over one billion samples (taps) using sequence Prisms. W...

The paper addresses tlie design of tlie polyphase IIR filters based on the “’-order single-coefficient allpass sub-filters in the constraint coefficient space using the Constraint Dowdiill Simplex Algorithm. Incorporating the bit-flipping algorithm into its core engine allowed the optitilisation routine to converge to better target designs without affecting tlie Iiigli speed of tlie original al...

In the present paper, we discuss a method to design a linear phase 1-dimensional Infinite Impulse Response (IIR) filter using orthogonal polynomials. The filter is designed using a set of object functions. These object functions are realized using a set of orthogonal polynomials. The method includes placement of zeros and poles in such a way that the amplitude characteristics are not changed wh...

In this paper, we propose an architecture synthesis methodolog ‘ to realize cascaded Infinite Impulse Response (IIRJfilter in Table Look Up (TLU) Field Progmmmable Gate A m y s (FPGA). The synthesis procedure involves a systematic tmnsfomation of the Dependance Graph (DG) corresponding to the cascaded IIR filter t o a Papelined Fized Full Size A+ my (PFFSA). We ofler an implementation of a casc...

In this paper, we propose an adaptive IIR equalizer based on prefiltering techniques. The proposed equalizer has a cascade structure of an ARMA prefilter and an adaptive FIR equalizer. The ARMA prefilter is designed based on the transfer function estimated by the gradient-type instrumental variable algorithm. Simulation results are shown to confirm the performance of the proposed adaptive IIR e...

In this paper an improvement of a Genetic algorithm using in constructing an IIR digital filter is presented. The aim of our improvement are reconstruction of genetic operators and new procedure for initial population selecting applied on a filter design problem. The result of the paper is modified genetic algorithm which allow us to find the best IIR filter among all filters with a requaired t...

The advantages and current limitations of sub-band approaches to echo cancellation are reviewed. Polyphase allpass IIR halfband decimators and interpolators are presented. Their performance is compared to QMF structures in NLMS sub-band echo cancellation for hands-free telephone signals recorded in a car. The polyphase allpass IIR case is shown to give around 2 dB more ERLE with one fifth of th...

This paper derives su cient time-varying bounds on the maximum variation of the coe cients of an exponentially stable, linear, time-varying and recursive lter. The stability bound is less conservative than all previously derived bounds for time-varying IIR systems. The bound is then applied to control the step size of output error adaptive IIR lters to achieve exponentially stable operation. Ex...