In this paper method of design and optimization of stable IIR digital filters with non-standard amplitude characteristics using continuous ant colony optimization algorithm ACOR is presented. In proposed method (named ACO-IIRFD) dynamical changes of parameters in designed filters are introduced. Due to these dynamical changes of filter parameters, design of IIR digital filters with small deviat...

Halfband lowpass and bandpass filters, versatile building blocks in a multitude of DSP applications, are revisited. Linear-phase FIR and minimum-phase IIR halfband filters for sample rate alteration are recalled, their computational loads are compared, and optimum signal flow graphs are presented. The same comparisons are carried out for corresponding complex halfband filters (Hilbert-transform...

FIR (finite impulse response) digital filters are open loop signal processors. These are numerical filters, and roundoff takes place within these filters when certain numerical operations are performed upon the filter input signals. Roundoff also takes place in IIR (infinite impulse response) digital filters. These are feedback filters, and the effects of quantization in IIR filters are more co...

A recursive weighted median (RWM) filter structure admitting negative weights is introduced. Much like the sample median is analogous to the sample mean, the proposed class of RWM filters is analogous to the class of infinite impulse response (IIR) linear filters. RWM filters provide advantages over linear IIR filters, offering near perfect “stopband” characteristics and robustness against nois...

A new class of two-channel IIR/FIR filter banks was introduced in [1] with half-band IIR analysis filters and FIR synthesis filters. This type of filter bank features very lowcomplexity analysis filters and simultaneously a low overall complexity. In this paper, we consider finite-wordlength effects of these filter banks.

Digital filters provide an important role in the world of communication. This paper proposes a literature review related to design the digital filters for audio application using multi rate signal processing. One of the important applications in multi rate signal processing is sub band coding. Humming sounds are present in the speech signal which cannot be removed easily and without filtering c...

In this paper we examine the orthogonal wavelet decomposition of ECG signal obtained using computationally efficient IIR perfect reconstruction quadrature-mirror filter (QMF) banks. The decomposition is done using the lowpass branch iterated filter banks. The fifth order Butterworth and elliptic filters are employed. IIR filters’ polyphase components are two real all-pass structures of the firs...

An improved Infinite Impulse Response (IIR) Least Mean Squares (LMS) algorithm using parallel filters and evolutionary programming techniques is introduced. IIR filters have the attractive property that they require fewer computations than a corresponding FIR filter, but they are prone to instability and local minimum problems. Evolutionary algorithms are good in global optimization scenarios, ...

In this paper we investigate various subband AEC systems in real handsfree situation, including FIR and IIR analysis and synthesis QMF filterbanks in polyphase structure. The adaptation in the subbands is performed by the Affine Projection Algorithm in comparison to the NLMS algorithm. The IIR filters are superior to FIR filters in the sense that they lead to low signal delay and sharp frequenc...

In this chapter, the following abbreviations are used: Variable-denominator IIR VFD filters as VdIIR VFD filters. Fixed-denominator IIR VFD filters as FdIIR VFD filters. Allpass VFD filters as AP VFD filters. FIR VFD filters the same as FIR VFD filters. Symbol t is used to represent fractional delay (instead of the symbol d normally used to denote the operation of differentiation). Five frequen...