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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:
The digital function filters – algorithms and applications
Autorzy:
Siwczyński, M.
Drwal, A.
Żaba, S.
Powiązania:
https://bibliotekanauki.pl/articles/199949.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital function filters
digital irrational filters
analysis and synthesis irrational filters
recursive algorithms of function filters
Opis:
The simple digital filters are not sufficient for digital modeling of systems with distributed parameters. It is necessary to apply more complex digital filters. In this work, a set of filters, called the digital function filters, is proposed. It consists of digital filters, which are obtained from causal and stable filters through some function transformation. In this paper, for several basic functions: exponential, logarithm, square root and the real power of input filter, the recursive algorithms of the digital function filters have been determined The digital function filters of exponential type can be obtained from direct recursive formulas. Whereas, the other function filters, such as the logarithm, the square root and the real power, require using the implicit recursive formulas. Some applications of the digital function filters for the analysis and synthesis of systems with lumped and distributed parameters (a long line, phase shifters, infinite ladder circuits) are given as well.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 371-377
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filters and sequences
Autorzy:
Solecki, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1205111.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
filters
separation property
Fatou's lemma
Opis:
We consider two situations which relate properties of filters with properties of the limit operators with respect to these filters. In the first one, we show that the space of sequences having limits with respect to a $Π^0_3$ filter is itself $Π^0_3$ and therefore, by a result of Dobrowolski and Marciszewski, such spaces are topologically indistinguishable. This answers a question of Dobrowolski and Marciszewski. In the second one, we characterize universally measurable filters which fulfill Fatou's lemma.
Źródło:
Fundamenta Mathematicae; 2000, 163, 3; 215-228
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and simulation of the basic structures of active EMI filters
Autorzy:
Pasko, M.
Szymczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/97429.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
active filters
conducted noise
electromagnetic compatibility
EMI filters
Opis:
The main goals of this paper are an analysis and a simulation of selected basic structures of active EMI filters. The first part contains a presentation of selected structures of active filters, along with categorization by their properties in the field of detection and compensation of EMI noise and by the kind of feedback. Each structure's description is accompanied by an analytical discussion of their properties such as insertion loss (IL) and the impedance increase (ΔZ>sub>n). The second part contains results of simulations of the presented structures, with the aim being a comparison of their characteristics and determining proper operation conditions.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 88-101
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and implementation FIR filters using FPGA
Autorzy:
Jastrzębski, S.
Powiązania:
https://bibliotekanauki.pl/articles/331569.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
FIR filters
FPGA
hydroacoustic
Opis:
Underwater acoustic channels are characterized by multipath phenomenon whose characteristics are time varying. Multipath propagation contributes to signal fading, and causes intersymbol interference (ISI) in a digital communication system. Raised cosine filters are widely used in wireless communication systems and the effects of these filters are crucial to wireless communication systems, for example underwater communication systems. Pulse shaping filters are commonly used in digital data communication systems to limit intersymbol interference. Thus, digital filters have been recognized as primary digital signal processing operation. In order to apply DSP algorithms to wireless communication systems high density Field Programmable Gate Arrays have recently emerged as ideal implementation platforms for digital filters due to its potential speed and flexibility. This paper presents the design and implementation of FIR filters using FPGA technology. The following architectures of filters are studied: multiply and accumulate (MAC) standard FIR filter, parallel transposed FIR filter, and direct-form filter using Distributed Arithmetic (DA). The proposed filters have been designed and synthesized with ISE software, and implemented with a Virtex-II FPGA device.
Źródło:
Hydroacoustics; 2008, 11; 121-130
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of moving objects in image sequences using 3D velocity filters
Autorzy:
Schauland, S.
Velten, J.
Kummert, A.
Powiązania:
https://bibliotekanauki.pl/articles/908049.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przetwarzanie sygnału
filtr prędkości
filtr ruchu
wykrywanie obiektu
filtr cyfrowy
multidimensional signal processing
velocity filters
motion filters
object detection
wave digital filters
Opis:
A movement analysis of objects contained in visual scenes can be performed by means of linear multidimensional filters, which have already been analyzed in the past. While the soundness of the results was convincing, interest in those systems declined due to the limited computational power of contemporary computers. Recent advances in design and implementation of integrated circuits and hardware architectures allow realizing velocity filters if the n-D system is carefully adapted to the analyzed problem. In this paper, the fundamental principles of visual scene analysis by linear multidimensional filters are examined with respect to possible sources of degradation. The extraction of movement information and its practical use are demonstrated using a wave digital filter (WDF) implementation.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2008, 18, 1; 21-31
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of transmultiplexer integer filters
Autorzy:
Ziółko, M.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/229408.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fixed point arithmetic
MIMO systems
integer digital filters
Opis:
The designing of transmultiplexer systems relies on determining filters for the transmitter and receiver sides of multicarrier communication system. The perfect reconstruction conditions lead to the bilinear equations for FIR filter coefficients. Generally there is no way of finding all possible solutions. This paper describes methods of finding a large family of solutions. Particular attention is devoted to obtaining algorithms useful in fixed-point arithmetic needed to design the integer filters. As a result, the systems perform perfect reconstruction of signals. Additionally, a simple method is presented to transform any transmultiplexer into an unlimited number of different transmultiplexers. Finally, two examples of integer filters that meet perfect reconstruction conditions are shown. The first illustrates a FIR filter which does not require multiplications. The frequency properties of filters and signals are discussed for the second example.
Źródło:
Archives of Control Sciences; 2018, 28, 2; 223-238
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic characteristics of coarse-grained trickling filters
Autorzy:
Sawicki, J.
Bering, S.
Powiązania:
https://bibliotekanauki.pl/articles/1933154.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
hydraulic design
waste disposal
trickling filters
Opis:
A structural method of dimensioning trickling filters is proposed. Reactors applied in sanitary engineering are usually designed on the basis of formally simple technical instructions, but laboratory experiments have shown that the flow through a trickling filter can be described with the plug-flow model. With an additional function describing reaction intensity, the object's parameters can be calculated and its operation simulated for various technical conditions. If variability of the reaction rate is taken into account, numerical integration of the governing equations will be necessary.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 4; 425-437
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Auxetics as entropy filters - possible application
Autorzy:
Wojciechowski, K. W.
Kempinski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1938609.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska
Tematy:
superfluidity
entropy filters
auxetics
3He isotope
Opis:
In this note a sketch of the idea of applying auxetics to separation of 3He from a mixture of 4He and 3He by using auxetic entropy filters is presented.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 3; 271-272
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On modular filters
Autorzy:
Ambrożko, E.
Powiązania:
https://bibliotekanauki.pl/articles/745616.pdf
Data publikacji:
1989
Wydawca:
Polskie Towarzystwo Matematyczne
Opis:
The article contains no abstract
Źródło:
Commentationes Mathematicae; 1989, 29, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New approach to computer aided design of coupled resonator filters
Autorzy:
Kozakowski, P.
Mrozowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/309283.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
filtr mikrofalowy
optymalizacja
CAD
microwave filters
optimization
Opis:
A gradient based optimization technique along with a new definition of cost function is applied to synthesis of coupled resonators filters. The cost function is defined using location of zeros and poles of the filter's transfer function. The topology of the structure is enforced on each step of optimization and its physical dimensions are used as independent variables.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 1; 3-7
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two closed categories of filters
Autorzy:
Blass, Andreas
Powiązania:
https://bibliotekanauki.pl/articles/1364317.pdf
Data publikacji:
1977
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1977, 94, 2; 129-143
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultraviolet filters for sensors matching biological action spectra
Autorzy:
Garoli, D
Alaibac, M
Pelizzo, M G
Powiązania:
https://bibliotekanauki.pl/articles/173284.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ultraviolet
radiometers
filters
action curve
effective measurements
Opis:
A considerable interest is growing worldwide about the photobiological effects of the ultraviolet radiation; in fact, it has been demonstrated that ultraviolet radiation can affect both human health as well as the equilibrium of entire ecosystems. The relative effectiveness of ultraviolet radiation at a particular wavelength in producing a specific biological response is defined by an action spectrum. Broadband radiometers characterized by having a spectral response that matches an action spectrum allow the measure of the effective irradiance associated to an ultraviolet source. In this work we present the designs of interference filters to be used in radiometric heads. Their optimized transmission curve coupled to the spectral response of different ultraviolet photodiodes provides the match of the sensor spectral response with some selected action spectra. Development of instruments for the measurement of the effective solar irradiance is foreseen. The design of interferential filters which transmittance curve was optimized in order to match a target biological action spectrum is here presented.
Źródło:
Optica Applicata; 2014, 44, 4; 611-620
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bessel filters with vayring parameters
Filtry Bessela o zmiennych parametrach
Autorzy:
Kaszyński, R.
Piskorowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/158097.pdf
Data publikacji:
2004
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
filtry Bessela
zmienne parametry
Bessel filters
time-varying systems
Opis:
The paper presents the methodology how to vary in time values ω0i = ω0i(t) in selected links of a structure of low-pass Bessel filters. In examinations of the filters a significant shortening of the transient state is achieved at the cost of slight increase in the oscillations. It allows to shorten time intervals of filtered signals. Typical filtration results are presented which are obtained by simulations of selected structures of filters with varying parameters.
Wprowadzenie zmiennych w czasie parametrów ma na celu skrócenie czasu ustalania sygnału na wyjściu filtra. Ma to szczególne znaczenie w przypadku, gdy filtrację należy przeprowadzić na dużej liczbie sygnałów lub wielokrotnie ją powtarzać oraz w sytuacjach, gdy ważna jest prędkość wypracowywania sygnału wyjściowego. Szczególnie interesującym przypadkiem są dolnoprzepustowe filtry Bessela, które najlepiej nadają się do przenoszenia sygnałów prostokątnych. W artykule przedstawiona jest koncepcja wprowadzania zmiennych w czasie współczynników dla filtrów Bessela oraz badania symulacyjne w programie MATLAB.
Źródło:
Pomiary Automatyka Kontrola; 2004, R. 50, nr 12, 12; 29-32
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 252

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