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Electric energy meter with support of automatic remote acquisition
Skala, Milan ; Krajsa, Ondřej (referee) ; Koutný, Martin (advisor)
This master’s thesis deals with design and implementation of electric energy meter with support of automatic remote data collection. For the collecting of measured data is used narrowband PLC technology. The theoretical part describes the basic properties and standards of narrowband PLC technology, such as types of coupling circuits, modulations, frequency bands and interference problems. In the practical part, there is description of selected parts, such as control circuit power meter, modem, microcontroller and UART to USB converter. There are further described basic properties of narrowband PLC modem ST7570 by STMicroelectronics. The final chapter, implementation of the device, deals with designs of circuit PLC modem ST7570, power meter ADE7753 and converter USB to UART CP2102.
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Design and construction of measuring equipment for lightning research
Kirsanov, Ivan ; Krajsa, Ondřej (referee) ; Roubal, Zdeněk (advisor)
The main aim of this semester work is the design of meter of an electrostatic field in the open landscape. The theoretical part focuses on describing the theory of the creation of an electrostatic field and on proven measurement methods. The practical part of the bachelor's work is focused on the design of a measuring instrument, selection of components and justification. The practical part includes a block diagram of wiring.
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Implementation of the channel equalization algorithms used in FMT modulation
Krejča, Libor ; Krajsa, Ondřej (referee) ; Šilhavý, Pavel (advisor)
The objective of Diploma thesis is design of analysis tool for equalizers used in FMT modulation. The model of transmission channel was designed for simulations with FMT. The transmission path is modeled by test loop, which corresponds to DSL line. For this reason, some principles of DSL technology is described in the thesis. The principles of multicarrier modulation are introduced in first part. The multicarrier modulation with filter bank (FMT) is described in detail.The different methods of design the fiter bank are given and compared. Channel equalization are introduced in second part. The attention was focused on minimum mean square error filtering (MMSE). Decision feedback channel equalizer (DFE) is extended from linear MMSE equalizer. DFE equalizers were programmed in analysis tool. For computation of equalizer coeficients was used also equalizers based on adaptive algorithms and MMSE. The last part describes the results of DFE equalizers used in communication system with FMT modulation. Analysis tool was programmed in MATLAB with a graphical user interface. It allows to show mean square error, signal-to-noise ratio and transmission speed dependence on delay between original and distorted signal. Signal-to-noise ration is displayed also in individual subchannels and users can display mean square error dependence on different orders of DFE filters.
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Transmission network emulator
Urbanovský, Jozef ; Koton, Jaroslav (referee) ; Krajsa, Ondřej (advisor)
Diplomová práca sa zaoberá vývojom emulátoru prenosových parametrov dátovych sietí nad protokolovou sadou TCP/IP. Práca opisuje špecifiká sieťovej časti Linuxového jadra ako aj realizáciu emulátoru pomocou userspace programov ako tc, netem, ifb a iptables ovládajúcich jadro. Program pre emuláciu je realizovaný v jazyku Python a je ovládaný cez grafické rozhranie vytvorené s PyQt5. Aplikácia bola otestovaná a verifikovaná, že je dostatočne presnou reprezentáciou špecifikovanej WAN siete a že taktiež využíva prostriedky efektívne.
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Automated hardware testing equipment
Macháček, Jan ; Hošek, Jiří (referee) ; Krajsa, Ondřej (advisor)
This thesis is focused on the design of system for automated testing of hardware on Beagle Bone Black platform. The purpose of this thesis is to develop a complex device which will be able to test the functionality of general electronic devices before completion. Use the external measuring devices and design hardware to control them.
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Vehicle detection in images
Pálka, Zbyněk ; Přinosil, Jiří (referee) ; Krajsa, Ondřej (advisor)
This thesis dissert on traffic monitoring. There are couple of different methods of background extraction and four methods vehicle detection described here. Furthermore there is one method that describes vehicle counting. All of these methods was realized in Matlab where was created graphical user interface. One whole chapter is dedicated to process of practical realization. All methods are compared by set of testing videos. These videos are resulting in statistics which diagnoses about efficiency of single one method.
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Optimization of Ethernet network in manufacturing plant
Kratochvíl, Petr ; Kubánková, Anna (referee) ; Krajsa, Ondřej (advisor)
This diploma thesis describes the work performed in the optimization of the corporate network in the company Alps Electric Czech to expand the amount of information obtained about the state of the network and thus improve the response of the IT department to potencial errors. During the optimization, a monitoring system was also deployed and its connection to the helpdesk and a tailor-made website running on the Flask microframework. With the gradual deployment, adjustments were made based on feedback from the IT department staff. Overall, the network has become more clarified, increasing the efficiency of maintenance and service.
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Design and realization of USB sound card with a guitar and microphone preamplifier
Bajzík, Jakub ; Hanák, Pavel (referee) ; Krajsa, Ondřej (advisor)
The term paper analyzes the available audio codecs platforms for the implementation of an external sound card with USB interface. It includes a complete design of differential microphone preamplifier with balanced input and single-ended guitar preamplifier with unbalanced input. The main circuit is completed by dual supply voltage, phantom power and signal indication. The term paper also includes a software simulation of preamplifier circuits and design of the printed circuit board. The final product was measured focusing on audio signal transfer.
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