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Tube guitar amplifier
Mostecký, Jan ; Balík, Miroslav (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor thesis studies guitar tube amplifiers. The thesis introduces basic concepts behind electrical valve circuits. After that there is a scheme of a modified vacuum tube amplifier designed by the author. The functionality of the design has been verified via computer simulation. Designed amplifier was built afterwards and its functionality was verified via measurements.
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Class AB stereo audio amplifier with output power 2 x 120 W / 4 ohms
Pavlovič, Matúš ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
In this bachelor thesis we will deal with the design of a stereo amplifier with a power stage in working class AB with a nominal power of 2x120 W / 4. We decided to design the audio amplifier itself into blocks, while we can expand the individual blocks by others if necessary. In the first chapter we propose frequency corrections for an audio amplifier using operational amplifiers. In the second chapter we will propose an indication of the excitation of the audio amplifier, using the integrated circuit LM3915 in connection with LED diodes. In the third chapter we will design the power stage of the audio amplifier operating in class AB with a power of 120 W. In the fourth chapter we will design the protection of the connected speaker to the amplifier. In the sixth chapter we will design the power circuits for the audio amplifier. The next chapters will describe the implementation and measurement of the proposed audio amplifier.
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Advanced algorithms for compression of video sequences with ultra high resolution
Soukeník, Ondřej ; Kratochvíl, Tomáš (referee) ; Polák, Ladislav (advisor)
This bachelor thesis provides an overview of advanced video codecs and explores their applicability for compression ov videosequences in ultra high resolution (UHD). The thesis is divided into two parts, theoretical and experimental. The theoretical part of the thesis gives an overview of advanced video codecs for video compression. Furthermore, objective metrics used for evaluation of the quality of a compressed video are briefly described. This part of the thesis also contains a detailed description of the created tool, employing a reference implementation of the selected video codecs, for easy compression of video sequences in UHD. This tool is used in the experimental part to compress different video sequences. The compression efficiency of each video codec is evaluated in terms of different objective metrics. Furthermore, the Bjntegaard Delta analysis is employed to obtain infromation about the compression efficiency of the used video codecs.
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Mixing console for audio signals
Ryšavý, Ondřej ; Kufa, Jan (referee) ; Kratochvíl, Tomáš (advisor)
Bachelor’s thesis on the topic „Mixing console for audio signals“ deals with the design and production of a mixing console for mixing several independent audio channels. In the first step is designed a block diagram and then a circuit diagram. The overall configuration of the mixing console is: Four mono inputs, designed as a combined XLR/JACK 6,3 mm input, where you can connect a microphone or other mono signal (not both at the same time), two stereo inputs RCA(CINCH). Each channel allows five-band frequency correction, panorama, signal level control and signal level detection. The output is realized per line connectors (for connection to the amplifier), headphone output and headphone amplifier. After design, the mixing console is producted, revived and then measured in an audio laboratory.
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Analog studio compressor with adustable band-pass filter
Ledvina, Matej ; Kratochvíl, Tomáš (referee) ; Šotner, Roman (advisor)
This thesis deals with design of a dynamic range compressor complemented by an adjustable band pass filter. This device features wider usability than a standard dynamic compressor while simultaniously being able to replace specialized ones. Presented solution utilizes voltage controlled filters of KHN topology to limit the bandwidth of either the processed signal or the controling signal and integrated voltage controled amplifiers for adjustment of dynamics. The design requirements are verified by computer simulation.
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Multifunction speaker with wireless connectivity
Baránek, Michal ; Kratochvíl, Tomáš (referee) ; Kufa, Jan (advisor)
Tato práce se věnuje multifunkčnímu systému s více možnostmi pro přenos zvukového signálu do reproduktoru. Problémem u dnes velmi populárních komerčních přenosných reproduktorů je absence autonomního zdroje hudby, například v podobě rádia. Proto je cílem této práce právě dosáhnout takového multifunkčního reproduktoru podobnému jako jsou komerční přenosné reproduktory, ale s možností přehrávání radia distribuovaného pomocí internetové sítě. Další z nejdůležitějších funkcí těchto reproduktorů je bezdrátové připojení, jako je Bluetooth, pro streamování zvuku, například z telefonu do reproduktoru. Další významné aspekty těchto reproduktorů jsou jednoduché uživatelské rozhraní, převážně ve formě ovládacích tlačítek, kvalitní zvukový výstup s přiměřeným výstupním výkonem k velikosti reproduktoru a velkou výdrží baterie pro několika hodinový poslech na nízké nebo střední úrovni hlasitosti. Proto jsou i tyto všechny funkce implementovány v této práci výroby multifunkčního reproduktoru.
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Bonding, the method for increasing DSL data rate
Kratochvil, Tomáš ; Benešl, Lukáš (referee) ; Šilhavý, Pavel (advisor)
This bachelor thesis focuses on characteristics of DSL bonding technology. The basic information about DSL technologies is described at the start of theoretical part of thesis. VDSL2 technology is described more thorougfully in comparision with other DSL technologies, because in this thesis DSL bonding is applied on VDSL2 technology. Next chapter of theoretical part of thesis describes principe of DSL bonding technology. Final chapters of theoretical part of thesis describes recommendations for testing of network characteristics. Specifically these network testing recommendations are described: RFC 2544, RFC 6349 and Y 1564. The results of performed tests are presented in practical part of thesis. Tested DSL technologies are compared based on results of performed tests at the end of practical part of thesis.
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Price building - the issue of pricing on the example of the entry fee to Gigathlon Czech Republic 2016
Kratochvíl, Tomáš ; Šíma, Jan (advisor) ; Višněvský, Andrej (referee)
Title: Price building - the issue of pricing on the example of the entry fee to Gigathlon Czech Republic 2016 Objectives: The main objective of this thesis is to determine the price rally in the endurance race Gigathlon Czech Republic 2016. Another goal is to analyze the race Gigathlon Czech Republic in 2016 and the formation of the costs (expenses) in this race. The aim of this thesis is the analysis of competitive races. Methods: The work methods were used to calculate the price of the entry fee - cost method, competitive pricing and the method according to the return on investment. Further analysis method was used, which was used in the analysis of plant Gigathlon and competitive races. The last method was an interview which was obtained information about the race Gigathlon Czech Republic in 2016 by the main organizer of this event. Results: Entry fee rates for the category Team of five and Couple were achieved using the method of competitive pricing. The single category for this method was determined while the highest price. In the final pricing has been used only a combination of methods, but also to take into account the expected number of competitors and the Swiss pricing model. The results were then compared with the actual price of the entry fee. Between the amounts are only slight...
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