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Wyszukujesz frazę "digital synthesis" wg kryterium: Temat

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    Wyświetlanie 1-13 z 13
    Tytuł:
    Digital microcontroller for sonar waveform generator
    Autorzy:
    Schmidt, A.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332754.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    direct digital synthesis (DDS)
    digital transmitter
    transmitter controller
    Opis:
    Generating sounding signals is essential for the operation of active sonar. The system should be highly reliable. This can be achieved through architecture, communication between the devices, and a well-designed and self–testing software. The system presented in the article is responsible for the generation of hydroacoustic sounding signals, and ensures proper interaction between power amplifiers and power supplies. Thanks to its structure, the system ensures a very stable generation of many complex sounding signals in the form of linear or hyperbolic frequency modulated pulses (up or down), continuous transmission wave with increasing frequency and others. It is used in the mine-countermeasure sonar, but can also be used in other types of hydroacoustic systems which require complex sounding signals. The article describes possible technical solutions and sounding signals.
    Źródło:
    Hydroacoustics; 2016, 19; 353-360
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Arbitrary waveform generator for charge-pumping
    Autorzy:
    Iwanowicz, M.
    Pióro, Z.
    Łukasiak, L.
    Jakubowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/308629.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    arbitrary waveform generator,
    calibration
    charge-pumping
    digital synthesis
    noise
    Opis:
    The paper presents a new signal generator for charge-pumping. Modular structure of the generator is discussed with special emphasis on signal-generation module consisting of five independent signal channels. Digital signal synthesis is chosen to minimize inaccuracies. Noise analysis is performed to demonstrate the validity of the design of signal channel. Calibration procedure is also discussed.
    Źródło:
    Journal of Telecommunications and Information Technology; 2007, 3; 78-83
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DDS-based multiple frequencies generator for the RF systems at INFN-LNS
    Autorzy:
    Caruso, A.
    Calabretta, L.
    Sparta, A.
    Speziale, F.
    Zappala, E.
    Zhe, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/148701.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    direct digital synthesis (DDS)
    radio-frequency (RF)
    superconducting cyclotron
    Italy
    Opis:
    We are going to change the present radio-frequency sources with a new one, based on the Direct Digital Synthesis (from now on referred to as DDS) technique [6]. A first prototype with three different sinusoidal signal sources has been tested and the preliminary results give us some confidence for future applications. In brief, we would like to obtain a multiple frequencies system where the present stability between our RF systems is still ensured, together with a more flexible and easier way to synthesise the sinusoidal signals.
    Źródło:
    Nukleonika; 2003, 48,suppl.2; 69-72
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    UML Modelling in Rigorous Design Methodology for Discrete Controllers
    Autorzy:
    Łabiak, G.
    Adamski, M.
    Doligalski, M.
    Tkacz, J.
    Bukowiec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/227244.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    UML modelling
    binary controller
    decomposition
    digital synthesis
    formal analysis
    verification
    Opis:
    The paper presents an application of UML technology in a discrete system development process. In the process at the analysis stage UML diagrams are fundamental tool. The outcome of this stage is a basis for formal models exploited at the design stage, where the design is symbolically verified and treated as a rule-based system. Two formal models of good graphical appeal are proposed: Petri nets and state machine diagrams. Both are heavily using Boolean expressions what makes that design can easily be implemented in modern programmable structures.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 1; 27-34
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer application in music - a survey
    Autorzy:
    Kotoński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954535.pdf
    Data publikacji:
    1999
    Wydawca:
    Politechnika Gdańska
    Tematy:
    digital sound synthesis
    digital registration of sound
    digital sound processing
    sampling
    samplers
    music programs
    digital music instruments
    simulation of compositional process
    Opis:
    Two main applications of computers in music - sound synthesis and simulation of the compositional process are presented in this paper. Other applications of computers, such as digital sound recording or editing and mixing of sound tracks are also objects of discussion.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 2; 159-170
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SMTBDD : New Form of BDD for Logic Synthesis
    Autorzy:
    Kubica, M.
    Kania, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/226064.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    logic synthesis
    SMTBDD
    decomposition
    technology mapping
    FPGA
    digital circuits
    Opis:
    The main purpose of the paper is to suggest a new form of BDD - SMTBDD diagram, methods of obtaining, and its basic features. The idea of using SMTBDD diagram in the process of logic synthesis dedicated to FPGA structures is presented. The creation of SMTBDD diagrams is the result of cutting BDD diagram which is the effect of multiple decomposition. The essence of a proposed decomposition method rests on the way of determining the number of necessary ‘g’ bounded functions on the basis of the content of a root table connected with an appropriate SMTBDD diagram. The article presents the methods of searching non-disjoint decomposition using SMTBDD diagrams. Besides, it analyzes the techniques of choosing cutting levels as far as effective technology mapping is concerned. The paper also discusses the results of the experiments which confirm the efficiency of the analyzed decomposition methods.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 1; 33-41
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power-aware scheduling of data-flow hardware circuits with symbolic control
    Autorzy:
    Özbaltan, Mete
    Berthier, Nicolas
    Powiązania:
    https://bibliotekanauki.pl/articles/1409402.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    symbolic discrete controller synthesis
    digital synchronous circuits
    power efficiency
    Opis:
    We devise a tool-supported framework for achieving power-efficiency of data-flow hardware circuits. Our approach relies on formal control techniques, where the goal is to compute a strategy that can be used to drive a given model so that it satisfies a set of control objectives. More specifically, we give an algorithm that derives abstract behavioral models directly in a symbolic form from original designs described at Register-transfer Level using a Hardware Description Language, and for formulating suitable scheduling constraints and power-efficiency objectives. We show how a resulting strategy can be translated into a piece of synchronous circuit that, when paired with the original design, ensures the aforementioned objectives. We illustrate and validate our approach experimentally using various hardware designs and objectives.
    Źródło:
    Archives of Control Sciences; 2021, 31, 2; 431-446
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The DDS Synthesizer (for FPGA Platform) for the Purpose of Research and Education
    Autorzy:
    Szomiński, Szymon
    Plichta, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1373686.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    frequency synthesis
    digital oscillations
    field programmable gate arrays systems
    FPGA
    Opis:
    The paper concerns the construction scheme of Direct Digital Synthesis (DDS) generator based on widely developed Field Programmable Gate Arrays (FPGA) technology. Firstly, the division of all generators is presented regarding the fact whether they generate sinusoidal or non-sinusoidal signals and whether the they have positive or negative feedback. Next chapter concerns how to generate frequency directly and indirectly synthesis and how to integrate these types of sytheses into the hybrid one. According to the blueprint, DDS generator if fully digital, which facilitates the control enabling to change almost at will the oscillation while the system works. Next chapters contain the conclusions and some proposals regarding practical application. DDS synthesizer has been made in accordance to the assumptions of the project, which was confirmed in practice. Control program enables us to fuse some measuring systems together into one, which facilitates simultaneous gathering of the data from several devices. Hence, the overall efficiency rises and the costs of carried out experiments are reduced. In the case of foreigners, it will be supplied by editors.
    Źródło:
    Schedae Informaticae; 2015, 24; 253-260
    0860-0295
    2083-8476
    Pojawia się w:
    Schedae Informaticae
    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:
    Method of high timing resolution pulse synthesis based on virtual sampling
    Autorzy:
    Liu, Hanglin
    Fu, Zaiming
    Kong, Dexuan
    Wang, Houjun
    Xiao, Yingdong
    Powiązania:
    https://bibliotekanauki.pl/articles/2106417.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pulse synthesis
    high resolution
    virtual sampling
    digital-to-analogue conversion
    downsampling
    Opis:
    Adjustable-width pulse signals are widely used in systems such as test equipment for hold time, response time and radar testing. In this study, we proposed a pulse generation method based on virtual sampling with ultra-high pulse width resolution. In the proposed method, the sampling rate of a digital-to-analogue converter (DAC) was adjusted to considerably improve pulse width resolution. First, the sampling rate was matched with the target pulse width resolution to digitally sample the ideal signal and generate digital waveform sampling points. Next, the signal bandwidth of the DAC was matched using a low-pass digital filter. Finally, the waveform sampling points were downsampled using an integer factor and output after digital-to-analogue conversion. The waveform pulse width information generated by high-frequency digital sampling was passed step by step and retained in the final output analogue signal. A DAC with a sampling rate of 1.25 GSa/s was used, and the pulse width resolution of the pulse signal was 0.1 ns. Theoretically, a sampling rate of 10 GSa/s is required to achieve 0.1 ns resolution. This method is simple, has a low cost, and exhibits excellent performance.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 2; 373--389
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Block-based physical modeling with applications in musical acoustics
    Autorzy:
    Rabenstein, R.
    Petrausch, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/907909.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    modelowanie fizyczne
    filtr cyfrowy
    filtr elektryczny
    synteza dźwięku
    physical modeling
    wave digital filters
    sound synthesis
    Opis:
    Block-based physical modeling is a methodology for modeling physical systems with different subsystems. Each subsystem may be modeled according to a different paradigm. Connecting systems of diverse nature in the discrete-time domain requires a unified interconnection strategy. Such a strategy is provided by the well-known wave digital principle, which had been introduced initially for the design of digital filters. It serves as a starting point for the more general idea of blockbased physical modeling, where arbitrary discrete-time state space representations can communicate via wave variables. An example in musical acoustics shows the application of block-based modeling to multidimensional physical systems.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 3; 295-305
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital approach to thermionic emission current to voltage conversion for high-voltage sources of electrons
    Cyfrowe podejście do metody konwersji natężenia prądu termoemisji elektronowej na napięcie dla wysokonapięciowych źródeł elektronów
    Autorzy:
    Kania, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/2174741.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    electron emission
    electron source
    control system synthesis
    digital control
    emisja elektronów
    źródło elektronów
    synteza systemu sterowania
    sterowanie cyfrowe
    Opis:
    The thermionic emission current is used in many vacuum devices such as evaporators, rare gas excimers, or electron beam objects for highenergy physics. The stability of the thermionic emission current is a very important requirement for the accuracy of those devices. Hence, there is a number of control systems that use a feedback signal directly proportional to the emission current in order to stabilize the thermionic emission current. Most of them use feedback from a high-voltage anode circuit to a low-voltage cathode circuit. However, there is a novel solution that uses linear cathode current distribution and processing of two cathode circuit voltage signals for converting the emission current to voltage. However, it is based on old-fashioned analog technology. This paper shows the thermionic emission current to voltage conversion method with the use of a digital control system. A digital realization of a multiplicative-additive algorithm is presented and proper work in closed-loop mode is confirmed.
    Prąd termoemisji elektronowej jest wykorzystywany w wielu przyrządach próżniowych takich jak ewaporatory, ekscymery gazów rzadkich czy w fizyce wysokich energii. Stabilność natężenia prądu termoemisji elektronowej jest ważnym wymaganiem w kontekście dokładności tych przyrządów. Istnieje wiele układów regulacji natężenia prądu termoemisji elektronowej, które używają sygnału sprzężenia zwrotnego wprost proporcjonalnego do natężenia prądu termoemisji elektronowej w celu jego stabilizacji. Większość z nich wykorzystuje sprzężenie od wysokonapięciowego obwodu anody do niskonapięciowego obwodu katody. Istnieje nowe rozwiązanie, które wykorzystuje liniowy rozkład prądu katody oraz przetwarzanie dwóch sygnałów z obwodu katody w celu konwersji natężenia prądu termoemisji na napięcie. Niestety metoda ta bazuje na przestarzałej technologii analogowej. W niniejszej pracy pokazana została konwersja natężenia prądu termoemisji elektronowej na napięcie z użyciem cyfrowego układu automatycznej regulacji. Cyfrowa realizacja algorytmu multiplikatywno-addytywnego została zaprezentowana, a poprawna praca w zamkniętej pętli sprzężenia zwrotnego potwierdzona.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2022, 12, 4; 78--81
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Efficient Classification of Hyperspectral Remotely Sensed Data Using Support Vector Machine
    Autorzy:
    Mahendra, H. N.
    Mallikarjunaswamy, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134051.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    support vector machine
    SVM
    central processing unit
    CPU
    digital signal processor
    DSP
    field programmable gate array
    FPGA
    high level synthesis
    HLS
    hardware description language
    HDL
    Opis:
    This work present an efficient hardware architecture of Support Vector Machine (SVM) for the classification of Hyperspectral remotely sensed data using High Level Synthesis (HLS) method. The high classification time and power consumption in traditional classification of remotely sensed data is the main motivation for this work. Therefore presented work helps to classify the remotely sensed data in real-time and to take immediate action during the natural disaster. An embedded based SVM is designed and implemented on Zynq SoC for classification of hyperspectral images. The data set of remotely sensed data are tested on different platforms and the performance is compared with existing works. Novelty in our proposed work is extend the HLS based FPGA implantation to the onboard classification system in remote sensing. The experimental results for selected data set from different class shows that our architecture on Zynq 7000 implementation generates a delay of 11.26 μs and power consumption of 1.7 Watts, which is extremely better as compared to other Field Programmable Gate Array (FPGA) implementation using Hardware description Language (HDL) and Central Processing Unit (CPU) implementation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 3; 609--617
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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