Jelena D. Certic

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Digital filter design can be performed very efficiently using modern computer tools. The drawback of the numeric-based tools is that they usually generate a tremendous amount of numeric data, and the user might easily lose insight into the phenomenon being investigated. The computer algebra systems successfully overcome some problems encountered in the(More)
A simple tuning scheme that shifts the crossover frequency of the start-up IIR half-band filter pair to the desired location has been introduced recently. In this paper, the approximation of the tuning scheme is derived in a manner that makes this scheme suitable for fixedpoint arithmetic. The effects of the approximation error to the frequency responses(More)
In this paper, we propose a novel approach for constructing the first-order differentiator. It has been shown recently that an efficient Finite Impulse Response (FIR) wideband differentiator can be synthesised when applying the multirate and Frequency-Response Masking (FRM) techniques. The overall signal processing task is shared between a very loworder(More)
Special events such as music festivals, sports etc are characterised as “high user density” where user behaviour is determined by the dynamics of the event. This is the reason that it is necessary for a mobile network operator to dimension its network based on maximum expected resource requirements instead on averaged values. Although special events are(More)
A new filter class with variable cut-off frequency is designed based on elliptic filter sharpening technique. A higher order IIR filter with a sharp transition band is constructed by using several identical low-order EMQF (elliptic minimal Q-factors) filters and an additional compensating section. The stopband attenuation is achieved by cascading EMQF(More)
This paper concentrates on the computationally efficient implementation of three classes of complementary IIR filter pairs with tunable crossover frequency. Class I denotes the IIR filter pair implemented as a parallel connection of two all-pass filters, whereas Class II (Class III) stands for the tapped cascaded interconnection of two distinct all-pass(More)
In this paper, we consider the application of a recursive half-band filter pair in the structure of two-channel filter bank, which is based on the frequency response masking (FRM) technique. The recursive filter pair is used as a complementary model filter pair, whereas the masking filters are linear-phase FIR filters. Efficient realization structures for(More)
This paper presents two-channel and three-channel complementary filter banks self-adjusting to the power spectral distribution of its input signal. The filter banks are based on EMQF or Butterworth double-complementary filter pairs. The adjustment of the 3dB-crossover frequency is achieved by a simple tuning algorithm that is suitable for the EMQF and(More)