2001/3

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    Flip-Flop Sensor Controlled by Slow-Rise Control Pulse
    (Společnost pro radioelektronické inženýrství, 2001-09) Kollar, M.
    In this paper we deal with dynamic properties of the flip-flop sensor. Special attention will be paid to the condition of control by slow-rise segment of the control pulse and the derivation of the equivalent voltage. The results of the theoretical considerations are verified by simulations using SPICE, VERILOG, and a laboratory experiment.
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    Pseudo-Chaotic Sequences Generated Using Integer-Number Iterations
    (Společnost pro radioelektronické inženýrství, 2001-09) Sebesta, V.; Kolouch, J.
    A proposed system generates a pseudo-chaotic sequence using integer-number look-up-table (LUT). The current output of LUT is used as LUT input address in the next step. The generated sequence approximates or simulates a chaotic sequence. The main facility of the method is high speed of the generating the main drawback is bounded length of the non-periodic part of the pseudo-chaotic sequence.
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    Filtering of the Color Images Distorted by Impulse Noise
    (Společnost pro radioelektronické inženýrství, 2001-09) Stupak, C.
    The paper deals with color image filtering distorted by impulse noise. The component, transformation, and vector filtering are analyzed. The filters are evaluated besides the classical criteria (mean absolute error and mean square error), and by the color difference criterion. Moreover, use of the impulse detectors in the color image filtration is analyzed.
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    Acceleration of Area Shift Calculation
    (Společnost pro radioelektronické inženýrství, 2001-09) Jurik, R.
    The goal of the area shift measurement is to find the coordinates (location) of the searched pattern of one two-dimensional sequence in the second two-dimensional sequence. It is supposed that searched pattern is included in the searched sequence in the unknown location. As it was published in [3], it is possible to determine the area shift using either the correlation or difference method. The calculations using the definition equations of the correlation or difference method are very severe. This contribution shows how it is possible to significantly decrease needed amount of the calculation operations when appropriate characteristics of the compared two-dimensional sequences are used. The method, which uses histogram comparison, allows eliminating up to 90 % of the searched patterns from the calculations that use the definition equations. The method that uses the comparison of the mean values of the searched pattern segments reaches even better results. It can eliminate up to 99.9 % of the searched patterns. Both new eliminating methods significantly contribute to acceleration of the area shift calculation.
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    Volterra Filtering for ADC Error Correction
    (Společnost pro radioelektronické inženýrství, 2001-09) Mikulik, P.; Saliga, J.
    Dynamic non-linearity of analog-to-digital converters (ADC) contributes significantly to the distortion of digitized signals. This paper introduces a new effective method for compensation such a distortion based on application of Volterra filtering. Considering an a-priori error model of ADC allows finding an efficient inverse Volterra model for error correction. Efficiency of proposed method is demonstrated on experimental results.