2000/1

 

Recent Submissions

  • Echo Cancellation I: Algorithms Simulation 

    Brodsky, M.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2000-04)
    Echo cancellation system used in mobile communications is analyzed. Convergence behavior and misadjustment of several LMS algorithms are compared. The misadjustment means errors in filter weight estimation. The resulting ...

  • Empirical Models for Indoor Propagation in CTU Prague Building 

    Pechač, Pavel; Klepal, M. (Společnost pro radioelektronické inženýrství, 2000-04)
    Indoor propagation modelling is demanded for the design and maintenance of indoor wireless services. Empirical modelling seems to be the most efficient approach. Even so there are many studies dealing with empirical models ...

  • Echo Cancellation II: Double Talk Detection and Environmental Noise Influence 

    Brodsky, M.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2000-04)
    Two problems arising in the real-life application of echo cancellation systems are analysed.The first, simultaneous activity of both telephone users (double talk) deteriorates the echo suppression. The second, environmental ...

  • Electromagnetic Field in Anechoic and EMC Chambers - Part I - Modelling 

    Mazanek, M.; Klepal, M.; Pechač, Pavel (Společnost pro radioelektronické inženýrství, 2000-04)
    Anechoic and EMC chamber at the CTU in Prague was designed and used for a variety of antenna measurements and EMI testing. Due to different measurement methods (near field, far field, compact range, and EMI measurement) ...

  • AN Adaptive Control of LUM Smoother 

    Lukac, R. (Společnost pro radioelektronické inženýrství, 2000-04)
    In this paper is presented a new design of LUM smoother. The LUM smoother, a subclass of lower-upper-middle (LUM) filters is used in smoothing image and signal applications. This filter very well can suppress impulsive ...

  • Investigation of predictability of Chaotic Signals 

    Sebesta, V. (Společnost pro radioelektronické inženýrství, 2000-04)
    Variables and functions for expressing quality of the prediction of the chaotic signal can serve as tools for simplified but useful description of the chaotic signal. In this paper, the known generation mechanism of chaos ...

  • Adjoint Networks with Inverting and Noninverting Current Conveyors 

    Vrba, K.; Dostal, T.; Cajka, J. (Společnost pro radioelektronické inženýrství, 2000-04)
    Four types of second-generation current conveyors are shown. The realisation of the above conveyors using differential voltage current conveyors (VDCC) is presented. Two examples illustrate the building of adjoint networks ...

  • Possibilities of Using Several Discrete Transforms for the Video Compression 

    Chromy, I. (Společnost pro radioelektronické inženýrství, 2000-04)
    This paper treats of compression of digital video signals and the main aim is to probe the possibility of using several discrete transforms besides well-known discrete cosine transform (DCT). Mathematical description of ...

  • Hybrid Coding of Image Sequences by Using Wavelet Transform 

    Levicky, D.; Petrulak, P.; Radoczi, P.; Surin, M. (Společnost pro radioelektronické inženýrství, 2000-04)
    In this paper, a new method of hybrid coding of image sequences by using wavelet transform is proposed. The basic MPEG scheme with DCT has been modificated in sense of replacement DCT by wavelet transform. In the proposed ...

  • VHDL Model of Electronic-Lock System 

    Vlcek, K.; Bannister, B. R.; Miklik, D.; Bell, I. M.; Bartsch, E.; Noga, J. (Společnost pro radioelektronické inženýrství, 2000-04)
    The paper describes the design of an electronic-lock system which was completed as part of the Basic VHDL course in the Department of Control and Measurement Faculty of Electrical Engineering and Informatics, Technical ...

  • Recognition of Transient Phenomena in a Biosignal 

    Marsalek, K.; Rozman, J. (Společnost pro radioelektronické inženýrství, 2000-04)
    Electrical Activity of a human brain measured on the skull (electroencephalogram, EEG) contains in the sleep period many transients (sleep spindles, spike-like structures or vertex waves), i. e. bursts of EEG activity of ...