2000/1

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    Possibilities of Using Several Discrete Transforms for the Video Compression
    (Společnost pro radioelektronické inženýrství, 2000-04) Chromy, I.
    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 these transforms is presented in the article. DCT and other orthogonal transforms are described here. Matrix notation of computation of two-dimensional transform is also presented. The comparison of the results obtained by application of the transforms on pictures is introduced.
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    Electromagnetic Field in Anechoic and EMC Chambers - Part I - Modelling
    (Společnost pro radioelektronické inženýrství, 2000-04) Mazanek, M.; Klepal, M.; Pechač, Pavel
    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) applied in the laboratory, different simulations were performed during the design process.
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    VHDL Model of Electronic-Lock System
    (Společnost pro radioelektronické inženýrství, 2000-04) Vlcek, K.; Bannister, B. R.; Miklik, D.; Bell, I. M.; Bartsch, E.; Noga, J.
    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 University of Ostrava, Czech Republic in co-operation with the Department if Electronic Engineering, University of Hull, Great Britain in the frame of TEMPUS project no. S_JEP/09468-95.
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    Investigation of predictability of Chaotic Signals
    (Společnost pro radioelektronické inženýrství, 2000-04) Sebesta, V.
    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 is used as a predictor but using the perturbed signal as an input. Prediction performance of the predictor is compared with the estimate of the predictability based on a mutual information between known quantities and a predicted value. mentioned two methods of investigation have different requirements for a priori knowledge of chaos. Certain constraints are given in consequence of an imperfection of numerical calculations and computer simulations.
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    AN Adaptive Control of LUM Smoother
    (Společnost pro radioelektronické inženýrství, 2000-04) Lukac, R.
    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 noise and preserve signal details, simultaneously. It is achieved by simply varying the filter parameter for smoothing. However, the tuning parameter for smoothing is fixed for the whole image. A new design is based on adaptive controlled level of the smoothing. The analysis of new methods is presented. Performance of the proposed methods is evaluated through subjective and objective criteria and compared with the traditional LUM smoother and the well known median.