1996/1

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    Optimisation of Microstrip Antenna
    (Společnost pro radioelektronické inženýrství, 1996-04) El Hamchary, H.
    When choosing the most appropriate microstrip antenna configuration for particular applications, the kind of excitation of the radiating element is an essential factor that requires careful considerations. For controlling the distribution of energy of the linear or planar array of elements and for coupling energy to the individual elements, a wide variety of feed mechanisms are available. In this paper, the coaxial antenna feeding is assumed and the best (optimised) feeding is found. Then, antenna characteristics such as radiation pattern, return loss, input impedance, and VSWR are obtained.
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    Adaptive Goertzel's Algorithm for DFT Computation with Higher Accuracy
    (Společnost pro radioelektronické inženýrství, 1996-04) Levicky, D.; Drutarovsky, M.; Galajda, P.; Kocur, D.; Marchevsky, S.
    In this paper the adaptive Goertzel's algorithm applied for required DFT coefficient computation in the harmonic analyser is described. This algorithm utilizes effective combination of the synchronous DFT and window method. The experiments with the adaptive Goerzel's algorithm given in this paper have shown that in the case of a harmonic analysis of periodical triangular wave it can provide the accuracy of the harmonic computation better than 0.01%.
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    Influence of the Number of the Features with the Neural Network Function
    (Společnost pro radioelektronické inženýrství, 1996-04) Tuckova, J.; Bores, P.
    This contribution is devoted to the evaluation of probability of success for classification and recognition techniques. It also depends on a proper selection of input elements-features and their number. Error probability is proportional indirectly on a quantity and quality of information provided to a classifier. It can be affected either by a learning algorithm itself and classification or by an element number on classification correctuers has been verified for Kohonen's map designed for a recognition of Czech digits.
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    The Computation of Forward Scattered Functions for Pruppacher - Pitter Raindrop Forms at 37 GHz
    (Společnost pro radioelektronické inženýrství, 1996-04) Bazant, L.
    The amplitude scattered functions were computed for Pruppacher - Pitter raindrop forms at 37 GHz by using the Multiple MultiPole numerical method. Before doing that the measurement of the complex permittivity of rain water had been performed at the same frequency and rain water complex permittivity values had been determined.
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    A Two-Level Classification Scheme for CDHMM-Based Discrete-Utterance Recognition
    (Společnost pro radioelektronické inženýrství, 1996-04) Nouza, J.
    In the paper a method of speeding up the response of a CDHMM based speech recognition system is introduced. The method, applicable for the recognition of discrete utterances, uses a two-level classification scheme. It consists in a fast match done with simplified models, followed by a final accurate match with a limited number of selected standard models. In this way the recognition time can be reduced by great deal without any significant loss of recognition accuracy. The method has been successfully applied in the design of real-time speech recognition systems operating with small and middle-size vocabularies.