Now showing items 41-60 of 61751

  • Time Domain Analysis of Linear Systems Using Laplace Inversion 

    Biolek, Dalibor (Společnost pro radioelektronické inženýrství, 1994-03)
    An efficient method of time domain analysis of linear systems is proposed. This method is based on the state space approach and on the numerical Laplace inversion. The problems of the sampled-data input signal and steady-state ...
  • The Current State of Mobile Communications in Europe 

    Black, T. (Společnost pro radioelektronické inženýrství, 1994-03)
    The last decade has seen unprecedented developments in land mobile communications in Europe. The introduction of analogue cellular networks in the early 1980 's started a revolution in technologies and services which, even ...
  • Design of the Decomposed State Model of an One-Dimensional Piecewise-Linear System 

    Kolka, Zdeněk (Společnost pro radioelektronické inženýrství, 1994-03)
    Present paper deals with the problem of automatic design of the implicit state model (in its decomposed parametric form) of any one-dimensional piecewise-linear (PWL) system. This model consists of the internal and the ...
  • Lattice All-Pole Structure of Digital Filters and Its Zero Input Response 

    Smekal, Z. (Společnost pro radioelektronické inženýrství, 1994-03)
    The lattice structures for linear prediction were formulated in speech processing by Makhoul [1]. The LPC coders are often used in the transmission of speech signals. Such systems include a filter in the receiver that ...
  • Fluctuations in LC Oscillators 

    Kulesov, V. N.; Lesukov, B.; Kudjak, V.; Ondracek, O. (Společnost pro radioelektronické inženýrství, 1994-03)
    An analysis of the phase and amplitude fluctuations in oscillators with simple resonant circuit is presented. Negative feedback is used to minimize effect of the inherent noise produced by bipolar transistor on fluctuation ...
  • Functional Stability Theory and Its Application in Complex Systems 

    Nahlik, J.; Hudec, L. (Společnost pro radioelektronické inženýrství, 1994-03)
    In the contribution the basic principles of the Functional Stability Theory are described, some problems discussed in more details, the Criterion of the Theory is shown, possibilities in Synergetics are mentioned and an ...
  • Design of an L-Band Dual Feedhorn for the Purposes of Microwave Search for ExtraTerrensial Intelligence 

    Horowitz, P.; Gimersky, M. (Společnost pro radioelektronické inženýrství, 1994-07)
    Logic behind the design of a dual feedhorn for the 26-meter Cassegrainian antenna of the Agassiz Station-Harvard-Smithsonian Observatory is presented in the paper. Theoretically predicted arid measured results in the ...
  • A Model of Medium Depolarisation Effects on Polarisation Vector Position 

    Hanuska, J.; Moc, J. (Společnost pro radioelektronické inženýrství, 1994-07)
    The paper presents the results of modelling the influence of real atmosphere with precipitation clouds on the radar signal polarisation status. The relationship between the signal vector depolarisation shift value and the ...
  • Waveguide Filters Supressing Higher-Order Passbands 

    Machac, J.; Menzel, W. (Společnost pro radioelektronické inženýrství, 1994-07)
    A new class of waveguide bandpass filters with suppressed higher-order passbands is described, designed, theoretically and experimentally verified. Methods of minimal autonomous blocks and mode matching are used for analysis. ...
  • Psycho-Acoustic Masking Phenomena - Use in Digital Storage and Transmission of Sound 

    Bezucha, P. (Společnost pro radioelektronické inženýrství, 1994-07)
    This article deals with psycho-acoustic masking effects and outlines their exploitation in the digital storage and transmission of sound.
  • Comparison of Several Modes in Simple ARC Second-Order Filter 

    Dostal, T.; Rybin, A. I. (Společnost pro radioelektronické inženýrství, 1994-07)
    In this paper the popular, multiple-feedback, ARC single opamp, highpass second-order filter is proposed in several types of modes, namely voltage, current and hybrid ones. These modes are studied and compared in detail. ...
  • Multichannel Spline Interpolation of Discrete Signals 

    Mihalik, J.; Zavacky, J. (Společnost pro radioelektronické inženýrství, 1994-07)
    This paper presents the multichannel sampling of a continuous-time signal with division of its frequency band into a few sub-bands. It deals with the combination of this sampling method and spline interpolation with the ...
  • Function Generator of Programmable Waveforms with Very Long Period Controlled by the Input Signal 

    Krejci, L. (Společnost pro radioelektronické inženýrství, 1994-09)
    The paper deals with design of slow generator of periodic waveforms the shape of which can be changed. The generator with the period adjustable by control signal could provide wide application.
  • New Version of the COCO Program 

    Cajka, J.; Fencl, F. (Společnost pro radioelektronické inženýrství, 1994-09)
    The new version of the COCO program enables the analysis of linear circuits in symbolical, symbolic numerical or in semi-symbolical form. Simple synthesis problems can also be solved with the aid of this program. Several ...
  • Digitally Controlled Linear Four-Port Network 

    Kolka, Zdeněk; Michalek, V. (Společnost pro radioelektronické inženýrství, 1994-09)
    The paper deals with the design of a universal linear multipart. The circuit is based on digitally controlled multiple voltage-controlled voltage sources (MVCVSs). The main advantages of this control are accuracy, ...
  • Atmospheric Optical Communications 

    Wilfert, O. (Společnost pro radioelektronické inženýrství, 1994-09)
    This article contains a description of a digital atmospheric optical link (DAOL). DAOL may find LAN applications as bridger between buildings containing cable subnetworks or as temporary quick-connects for which cable runs ...
  • Comparison of Adaptive Antenna Arrays Controlled by Gradient Algorithms 

    Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 1994-09)
    The paper presents the Simple Kalman filter (SKF) that has been designed for the control of digital adaptive antenna arrays. The SKF has been applied to the pilot signal system and the steering vector one. The above systems ...
  • DC Analysis of an Ideal Diode Network Using Its Decomposed Piecevise-Linear Model 

    Brzobohaty, J.; Pospisil, J.; Kolka, Zdeněk (Společnost pro radioelektronické inženýrství, 1994-09)
    A new method of finding the operating points in circuits containing ideal diodes which utilizes the decomposed form of the state model of an one-dimensional piecewise-linear (PWL) system is developed. The universal procedure ...
  • Electronic Equipment of Self-Actuated Mobile Device for Load Carrying 

    Krejci, L.; Janecka, T. (Společnost pro radioelektronické inženýrství, 1994-12)
    The device dealt in this work is determined namely for carrying invalid persons on various types of stairs or other not flat surfaces. But it can serve also to other purposes. To enable fulfilling all given demands, the ...
  • Diagnostic Methods for Planar Optical Waveguides 

    Ctyroky, J.; Janta, J.; Skalsky, M.; Schrofel, J. (Společnost pro radioelektronické inženýrství, 1994-12)
    Basic diagnostic methods for examining planar optical waveguides, namely the mode spectroscopy for determining the propagation constants of waveguide modes and two methods for measurement of attenuation coefficient of a ...