Realizable warped IIR filters and their properties
نویسندگان
چکیده
Digital lters where unit delays are replaced with frequencydependent delays, such as rst order allpass sections, are often called warped lters since they implement lter specications on a warped non-uniform frequency scale. Warped IIR (WIIR) lters cannot be realized directly due to delayfree loops. Speci c solutions have been known that make WIIR lters realizable but no general approach has been available so far. In this paper we will explore the generation of such lters, including new lter structures. The robustness and computational e ciency of WIIR lters are studied and most potential applications are discussed.
منابع مشابه
Stability of Linear Predictive Structures using IIR Filters
Considered are general, pure linear prediction schemes, where the prediction of the current sample is based on IIR-filtered past samples. Properties of these schemes are discussed, in particular, the whitening property, the realisation of the synthesis filter and its stability. The realisation problem as occurring in warped linear prediction is solved. Furthermore, it is proved that, at least f...
متن کاملA class of complementary IIR filters
A class of complementary IIR filters is introduced. One of these filters can be realized as a tapped cascaded interconnection of identical allpass subfilters. The complementary filter is then obtained automatically by adding some extra allpass subfilters and a subtractor. The proposed filters are always allpass complementary and, under certain conditions, also magnitude complementary. Further, ...
متن کاملDesign of IIR Digital Filter using Modified Chaotic Orthogonal Imperialist Competitive Algorithm (RESEARCH NOTE)
There are two types of digital filters including Infinite Impulse Response (IIR) and Finite Impulse Response (FIR). IIR filters attract more attention as they can decrease the filter order significantly compared to FIR filters. Owing to multi-modal error surface, simple powerful optimization techniques should be utilized in designing IIR digital filters to avoid local minimum. Imperialist compe...
متن کاملRealizable MIMO decision feedback equalizers: structure and design
Abstract— We present and discuss the structure and design of optimum multivariable decision feedback equalizers (DFEs). The equalizers are derived under the constraint of realizability, that is, causal and stable filters and finite decision delay. The design is based on a known dispersive discrete-time multivariable channel model, with infinite impulse response. The additive noise is described ...
متن کاملDirect Design of Parallel second-order filters for Instrument Body Modeling
This paper 1 presents a direct design technique for parallel second-order sections based on a perceptually motivated logarithmic scale, with application to instrument body modeling. Traditional FIR and IIR design techniques work on a linear frequency scale, which is usually not optimal for audio applications. Warped filters and Kautz filters are good candidates for perceptually motivated filter...
متن کامل