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The article describes and compares various digital methods for measurement of short delay between fast analogue signals. A brief characterization of measured signals is given in the first chapter. In the second chapter, there are described various measurement methods. In the third chapter, there are compared various versions of each method and in the last chapter, there are the methods compared one...
As there are also graph methods of circuit analysis in addition to algebraic methods, it is clearly possible in theory to carry out an analysis of the whole switched circuit in two-phase switching exclusively by the graph method as well. For this purpose it is possible to plot a Mason graph of a circuit, use transformation graphs to reduce Mason graphs for all the four phases of switching, and then...
This paper deals with the facial surface vibration measurement performed by three different methods. Facial vibrations were measured during performing the resonance voice exercises with different shape of vocal tract or with different length of the resonance tube. Vibrations were measured on the upper lip by vibrometer and on the ala of nose by accelerometer. The amplitude of oscillation was also...
Segmentation of moving areas in high-speed biomedical video sequences captured by light microscope often contains some false-positive results which are generated by artifacts present in the image, e.g. air bubbles or red blood cells moving across the video. Such artifacts are common part of tissue samples under microscope. Moreover, if they closely interact with the objects of interest or they are...
This paper describes the variants of realization of high voltage converter for purpose to minimizing of weight of traction transformer (so called “electronic-transformer”). The high voltage converter brings the possibility of using medium frequency transformer (with frequency for example 400Hz) instead of classical massive low frequency transformer (for trolley-line frequency 50Hz resp. 16.7Hz). This...
This paper describes the control algorithms for electric drive with single phase matrix converters supplied medium frequency converter for traction purpose. Described control algorithms realize the control of active and reactive power, output voltage, reduce harmonic disturbance in input current and oscillation of voltage on input filter etc. These control algorithms were implemented into multiprocessor...
This article deals with Industry 4 as a new paradigm for manufacturing of the future. Internet of Things and new communication approach can lead to next generation of automated solutions as next step from currently isolated automation systems to Cyber-Physical Systems. Article tries to create model for DDS protocol considering real time requirements with QoS features.
More and more light applications use multiple light emitting diodes to generate defined light spectra. Often reaching defined brightness levels and an exact color coordinate or color temperature is desired. The LEDs change their light spectra over time or under influence of different environmental temperatures. One possibility is to compensate the resulting color shift of the illumination by integrating...
The work introduces a new means for quantification of dynamic stability and upper limb movement as a whole during gait. Swinging arms during gait performed by the experiment volunteers, as a cyclic motion, was quantified using two parameters AH (the convex hull area) and already known to the medical community - ROM (range of motion) revealed a potential use of the former in the scientific community...
Drowsy driving is considered one of the most serious causes of fatal traffic accidents, especially for long distance drivers who struggle significantly during monotonous driving conditions. As a result, various types of warning systems have been proposed among other preventive measure against drowsy driving. These systems issue a warning upon detecting a decline in driving performance as indicated...
This paper deals with evaluation and simulation of direct detection radiometer, which operates in the W-frequency band. Radiometers can be used in wide range applications in industry, military and security as well. One of the possible applications where the radiometers can be used is scanning of concealed dangerous objects. Main part of the article deals with the theoretical analysis of the basic...
A pacemaker is a small electronic device implanted under the skin near the collarbone. Pacemakers monitor the heart's electrical activity. If the heart is beating too slowly or pausing too long between beats, the pacemaker will provide electrical impulses that stimulate the heart to beat. The pacemaker itself consists of a small box (the pulse generator with battery) and usually two leads that are...
This article describes one possible solution of bias networks for special broadband RF amplifiers. The purpose is amplification special pulse signals from particle detectors, which demands well defined time domain properties. The problem is demonstrated on two basic prototypes with different amplifier chips used in. Both are designed using standard components with poor results and using special broadband...
This paper describes a universal sinusoidal modulator developed primarily for the multilevel cascaded H-bridges converters. The modulator was implemented as a FPGA entity and its versatile features allows it to be easily reused in various topologies based on H-bridges. This includes the control of the H-bridge resonant converters by pulse frequency modulation so that it is well suitable for the power...
This article describes possible proposals of the active battery cell balancer for Li-ion battery-pack which should be used as a replacement of the common passive cell balancer in the existing battery management system. The main goal of this paper is to compare the most efficient solutions especially in terms of number of used components, size and price.
Several matters related to noise design for preamplifiers are presented for very low frequencies, also pointing to issues raised by some circuits in the literature, including those with noise cancelling circuits. The changes in excess noise with temperature are of interest in applications such as wearable, where large variations of temperature can occur.
This paper deals with a proposal of a carrier redistribution PWM and its comparison with a phase disposition PWM (PDPWM) and carrier redistribution PWM for a multilevel converter dedicated to high power medium voltage electric drives. The converter topology is based on a cascaded connection of two-level inverters, the so called dual inverter. The well known phase disposition PWM for multilevel converters...
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