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    Wyświetlanie 1-11 z 11
    Tytuł:
    A Procedure for Quasi-Equiripple Linear-Phase IIR Filters Design
    Autorzy:
    Konopacki, J.
    Mościńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/226676.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital filters
    IIR filters
    filters design
    Opis:
    The linear-phase IIR filters are described in many cases, mainly due to distortion-free transmission of signals. One of the major problems of IIR filter design is stability, which can be obtained with suitable value of group delay τ This paper concerns calculation of filter order Ν and group delay τ in case of quasi-equiripple design of IIR filters. We propose a novel procedure for determining N and τ values; the procedure is valid for all types of filters with arbitrary number of zeros and a few non-zero poles. Evaluation of the proposed approach as well as examples illustrating its application are provided in the paper.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 4; 393-398
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Sparse FIR Filters with Low Group Delay
    Autorzy:
    Konopacki, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1844604.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital filters
    FIR filter design
    sparse filters
    reduced group delay filters
    Opis:
    The aim of the work is to present the method for designing sparse FIR filters with very low group delay and approximately linear-phase in the passband. Significant reduction of the group delay, e.g. several times in relation to the linear phase filter, may cause the occurrence of undesirable overshoot in the magnitude frequency response. The method proposed in this work consists of two stages. In the first stage, FIR filter with low group delay is designed using minimax constrained optimization that provides overshoot elimination. In the second stage, the same process is applied iteratively to reach sparse solution. Design examples demonstrate the effectiveness of the proposed method.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 1; 121-126
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multisensor Tracking of Marine Targets : Decentralized Fusion of Kalman and Neural Filters
    Autorzy:
    Stateczny, A.
    Kazimierski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/226579.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    target tracking
    sensor fusion
    Kalman filter
    neural filters
    Opis:
    This paper presents an algorithm of multisensor decentralized data fusion for radar tracking of maritime targets. The fusion is performed in the space of Kalman Filter and is done by finding weighted average of single state estimates provided be each of the sensors. The sensors use numerical or neural filters for tracking. The article presents two tracking methods - Kalman Filter and General Regression Neural Network, together with the fusion algorithm. The structural and measurement models of moving target are determined. Two approaches for data fusion are stated - centralized and decentralized - and the latter is thoroughly examined. Further, the discussion on main fusing process problems in complex radar systems is presented. This includes coordinates transformation, track association and measurements synchronization. The results of numerical experiment simulating tracking and fusion process are highlighted. The article is ended with a summary of the issues pointed out during the research.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 65-70
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perturbation Element Effect on Frequency Stability in Dual Mode Reconfigurable Filters Based on Circular Microstrip Ring Resonators
    Autorzy:
    Albahnassi, Muhammad Haitham
    Malki, Adnan
    Almekdad, Shokri
    Powiązania:
    https://bibliotekanauki.pl/articles/227210.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dual mode ring resonators
    dual-mode filters
    perturbation element arrangement
    BW reconfigurability
    Opis:
    A detailed study about the suitable perturbation element shape and location for tunable BW dual mode microstrip filter which has circular ring resonator is presented. BW tuning is achieved by resonator geometry modification. The study explains the effect of a perturbation element on the stability of the center frequency during BW tuning. Different cases have been studied for two shapes of perturbation element; which one is a rectangular and the other is a radial. The treated cases discuss whether the perturbation element is located in the inner or in the outer circumference of the ring, and whether it is a patch or a notch. BW tuning simulation treated the case of FBW3dB increase for two and three times. The best case of perturbation element which has the best center frequency stability has been modeled, simulated, and fabricated at 2.4 GHz. Geometry modification of the filter took into account the RF MEMS modeling. The filter has an elliptic frequency response, and its FBW has been increased in five steps from 1.7% to 5%. The designed filters were evaluated experimentally and by simulation with very good agreement.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 4; 731-737
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Overview of the Methods of Synthesis, Realization and Implementation of Orthogonal 3-D Rotation Filters and Possibilities of Further Research and Development
    Autorzy:
    Poczekajło, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/1844643.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3-D filters
    orthogonal filter
    rotation filter
    Givens rotation
    synthesis
    realization
    implementation
    algorithms
    Opis:
    In the paper, an overview of the methods and algorithms of synthesis, realization and implementation used by the author to obtain orthogonal 3-D filters with a structure made of Givens rotations has been presented. The main advantage of orthogonal filters, which may have a lower sensitivity to quantization of the coefficients, was indicated. The author proposed a number of possible changes and modifications of individual stages, which may result in obtaining filters with even better parameters. The work will be the basis for the direction of further research.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 2; 295-300
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current mode fractional order filters using VDTAs with Grounded capacitors
    Autorzy:
    Prasad, Dinesh
    Kumar, Mayank
    Akram, Md Waseem
    Powiązania:
    https://bibliotekanauki.pl/articles/226881.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    VDTAs
    fractional order and filter
    Opis:
    In this work, the design of current mode Fractional order filter using VDTAs (Voltage differencing trans-conductance amplifier) as an active element with grounded capacitors has been proposed. The approximate transfer functions of low and high pass filters of fractional order on the basis of the integer order transfer has been shown and the form of those functions of filters is also implemented using VDTA as an active building block. In this work, filters of the different sequence have been realized. The frequency domain simulation results of the proposed filters are obtained on Matlab and PSPICE with TSMC CMOS 180 nm technology parameters. Stability and sensitivity is also verified.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 1; 11-17
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prefiltering in Wavelet Analysis Applying Cubic B-Splines
    Autorzy:
    Rakowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/226902.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wavelet
    scaling function
    wavelet analysis
    wavelet transform
    cubic box spline
    digital filters
    direct cubic B-spline filter
    prefiltering
    Opis:
    Wavelet transform algorithms (Mallat’s algorithm, a trous algorithm) require input data in the form of a sequence of numbers equal to the signal projection coefficients on a space spanned by integer-translated copies of a scaling function. After sampling of the continuous-time signal, it is most frequently possible to compute only approximated values of the signal projection coefficients by choosing a specific signal approximation. Calculation of the signal projection coefficients based on the signal interpolation by means of cubic B-splines is proposed in the paper.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 4; 331-340
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Pareto-Optimal Radar Receive Filters
    Autorzy:
    De Maio, A.
    Piezzo, M.
    Iommelli, S.
    Farina, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/227067.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radar receive filter design
    mismatched filte
    design
    multi-objective optimization problem
    Pareto-optimal points
    Opis:
    This paper deals with the design of radar receive filters jointly optimized with respect to sidelobe energy and sidelobe peaks via Pareto-optimal theory. We prove that this criterion is tantamount to jointly minimizing two quadratic forms, so that the design can be analytically formulated in terms of a multi-objective optimization problem. In order to solve it, we resort to the scalarization technique, which reduces the vectorial problem into a scalar one using a Pareto weight defining the relative importance of the two objective functions. At the analysis stage, we assess the performance of the receive filters in correspondence of different values of the Pareto weight highlighting the performance compromises between the Integrated Sidelobe Level (ISL) and the Peak Sidelobe Level (PSL).
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 4; 477-481
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of a novel FPGA-based system for filtering audio signals using a finite impulse response filters
    Autorzy:
    Lipowski, Adrian
    Majewski, Paweł
    Pluta, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2055238.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    audio filtering
    FIR filter
    FPGA
    signal processing
    Opis:
    In this article, an analysis of an innovative system for filtering signals in the audible range (16 Hz - 20 kHz) on programmable logic devices using a filters with a finite impulse response, is presented. Mentioned system was neat combination of software and hardware platform, where in the program layer a multiple programming languages including VHDL, JavaScript, Matlab or HTML were used to create completely useful application. To determine the coefficients of polynomial filters the Matlab Filter Design & Analysis Tool was used. Thanks to the developed graphic layer, a user-friendly interface was created, which allows easily transfer the required coefficients from the computer to the executive system. The practical implementation made on the FPGA platform, specifically on the Altera DE2- 115 development kit with the FPGA Cyclone IV, was compared with simulation realization of Matlab FIR filters. The performed research confirm the effectiveness of filtration in real time with up to 128th order of the filter for both audio channels simultaneously in FPGA-based system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 1; 19--26
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SIW/HMSIW Bandpass Filters for Ka Frequency Band Serving Wireless Applications
    Autorzy:
    Damou, Mehdi
    Benallou, Yassine
    Mansouri, Boualem
    Nouri, Keltouma
    Chetioui, Mohammed
    Boudkhil, Abdelhakim
    Powiązania:
    https://bibliotekanauki.pl/articles/1844526.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    filter
    SIW
    HMSIW
    CM
    Ka band
    wireless applications
    Opis:
    This paper describes a novel Substrate Integrated Waveguide (SIW) bandpass filter using Chebyshev approximation and Half Mode Substrate Integrated Waveguide (HMSIW)modeling technique. The developed 3 rd order filter structure uses an inductive iris and an inductive post station in a way it resonates in Ka frequency band serving wireless applications. The paper presents in details steps of the filter design formed by specific analytical equations to extract its different synthesizable parameters including coupling matrix, quality factor and initial geometric dimensions. The ideal frequency response of the filter is determined from an equivalent circuit that uses localized elements developed by AWR Microwave Software. High Frequency Structure Simulator (HFSS) is then employed to model the proposed filter structure and optimize its initial parameters until meeting the target specifications initially fixed in order to provide a high frequency response for the proposed filter design. Finally, the obtained results display a good performance for the proposed filter design and demonstrate a high usefulness for the employed technology that allows a low design volume.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 355-361
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finding Optimal Frequency and Spatial Filters Accompanying Blind Signal Separation of EEG Data for SSVEP-based BCI
    Autorzy:
    Jukiewicz, M.
    Buchwald, M.
    Cysewska-Sobusiak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226812.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    BCI
    SSVEP
    BSS
    FastICA
    AMUSE
    Infomax
    Extended Infomax
    CAR
    Large Laplacian
    Small Laplacian
    CCA
    Opis:
    Brain-computer interface (BCI) is a device which allows paralyzed people to navigate a robot, prosthesis or wheelchair using only their own brains reactions. By creating a direct communication pathway between the human brain and a machine, without muscles contractions or activity from within the peripheral nervous system, BCI makes mapping persons intentions onto directive signals possible. One of the most commonly utilized phenomena in BCI is steady-state visually evoked potentials (SSVEP). If subject focuses attention on the flashing stimulus (with specified frequency) presented on the computer screen, a signal of the same frequency will appear in his or hers visual cortex and from there it can be measured. When there is more than one stimulus on the screen (each flashing with a different frequency) then based on the outcomes of the signal analysis we can predict at which of these objects (e.g., rectangles) subject was/is looking at that particular moment. Proper preprocessing steps have taken place in order to obtain maximally accurate stimuli recognition (as the specific frequency). In the current article, we compared various preprocessing and processing methods for BCI purposes. Combinations of spatial and temporal filtration methods and the proceeding blind source separation (BSS) were evaluated in terms of the resulting decoding accuracy. Canonical-correlation analysis (CCA) to signals classification was used.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 4; 439-444
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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