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Audio D/A converter with external control using microcontroller
Špaček, Jan ; Stifter,, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This diploma thesis is devoted to the design of a laboratory measurement tool with DAC converter for audio and low frequency signals. In the introduction part a theoretical background of the ADC and DAC conversions are outlined. In the next chapters the technical solution of the laboratory converter is presented, including DAC with integrated circuit AD1852 and completed with digital audio receiver CS8416. This circuit secures compatibility with external audio devices with digital interfaces, like SPDIF or AES3. The digital receiver and audio DAC are added with serial communication interface for setup of the most audio and input parameters. This setup is operated by external microcontroller ATmega32 and original firmware. The thesis presents block diagram and schematic layout of the laboratory converter, including complete technical documentation for the construction and design.
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Speed and position measurement using optical and electromagnetic methods
Dvořák, Zdeněk ; Říčný, Václav (referee) ; Kratochvíl, Tomáš (advisor)
The project compares and describes the characteristics of optical and electromagnetic methods, used for measuring the object’s velocity. Some of these are used at the ballistic laboratory of PROTOTYPA, a.s. company. The rest is mentioned in order to increase the range of the project and are not engaged by the company. The practical part involves measuring and processing the magnetic fields of various appliances. There is a method and appliance designed to process the link between flying object and sensor.
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Mixing audio console with microphone preamplifier
Mecerod, Václav ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
Bachelor’s thesis on the theme "Mixing audio console with microphone preamplifier" deals with the design of an audio device for mixing signals from different sources. After a short theoretical introduction to issues mixing audio consoles, block diagram and circuit diagrams of each part are designed. These are redrawn into OrCAD Capture and using software PSpice simulations are performed. Configuration of the proposed mixing audio console is as follows: Two microphone preamplifiers with true differential inputs with switchable sensitivity, with the quad-band equalizer with tunable mid bands and adjustable delay. One line level input and one instrument input with three bands corrector. The output section consists of headphone and line level out.
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Measurement of DVB-T set top boxes selected parameters
Hrazděra, Tomáš ; Kratochvíl, Tomáš (referee) ; Štukavec, Radim (advisor)
This project treats of the system of the terrestrial digital TV broadcasting DVB-T. It explains the principles of source and channel encoding and the channel modulation. The analysis of parameters defined by the recommendation ETSI TR 101 290 for the purpose of measuring of the parameters of the digital TV broadcasting (set top boxes) is elaborated. Further it describes the functions of the set top box itself and executes the analysis of chosen receivers including the description of their typology. On its base the measurable parameters of commercially accessible receivers, which underwent the tests were chosen. The results are elaborated in the tabular and graphic forms, including the analysis of their influence on the quality of the received broadcast.
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Digital audio amplifier with universal inputs
Svadbík, Pavel ; Stifter,, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This diploma thesis deals with digital audio amplifier with universal inputs and its design. The first part describes modulation and audio formats for audio electronics. The thesis contain design of a block diagram of the digital audio amplifier and describes the requirements for functional blocks. As a basic device for audio signal processing was choosen integrated circuit STA326. The thesis continue with circuits design for each blocks with a description of their principles. The next section describes the construction and firmware for microcontroller. The last part of this diploma thesis is targeted on the presentation of the measured parameters of the amplifier. The conclusion summarizes the results that have been achieved and advantages and disadvantages of the digital audio amplifier prototype.
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Precise Audio Amplifier for Quality Listening
Janošík, Lukáš ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor thesis deals with a design of quality audio preamplifier designed for high quality production. The typology of whole design emphasizes very important transmission properties, i.e. high signal-to-noise ratio, high separation of channel, low distortion, The content of the semestral thesis is an symetrical input, relay input switch, 5 band equalizer with bypass and symetrical output with active line driver.
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Integrated multichannel audio amplifier for home cinema
Fišer, Ondřej ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This paper describes complete design of amplifier for home cinema system. Described amplifier has 2 digital inputs (TOSLINK and S/PDIF) and single analog input. With this inputs it is possible to connect amplifier to a source of surround audio 5+1 signal. Paper further discuss design of correction circuits, preamplifier, power amplifier and power source. The whole is controlled by 8-bit microprocessor and has a graphics output implemented through LCD display. The goal of this paper is to design and build high quality amplifier.
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Deinterlacing in uncompressed digital video sequences
Meňhart, Pavel ; Kratochvíl, Tomáš (referee) ; Slanina, Martin (advisor)
Interlacing is the process of frame scanning and frame displaying being based on the even and uneven lines‘ interchanging. This framework originated along with the PAL and NTSC television standards‘ formation in the course of 1930s. The process mentioned above stopped frames displayed on older TV sets from flashing. Nevertheless, there is a disadvantage of the frame processed after this manner, consisting in its attribute to be displayed in a clean-cut way just on classical TV sets. However, plasma and LCD television appliances, projectors and computer monitors always display the entire frame all at once, therefore composing it of the both fields, yet not being acquired concurrently, differing in moving objects‘ positions, moreover their contours are doubled, frayed and unfocussed. This master´s thesis deals with fundamentals of the interlaced video signal‘s formation, problems coming about at featuring the interlaced video like this, followed by operating methods of deinterlacing itself. In conclusion, there are my own softwares presented, having been developed in MATLAB computer environment and software command language C, and implementing some of the operating methods designed for deinterlacing in uncompressed digital video sequences.
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Three-way stereo speaker system with bassreflex
Burget, Jan ; Schimmel, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor‘s thesis contains complete design of three-way stereophonic loudspeaker sound system with bassreflex. There is detailed description of selection of acoustic transducers, their measurements and adjustments. As an integral part of this seminar study is design of loudspeaker baffle and calculations or simulation of bassreflex. And further,this study also deals with a design of loudspeaker crossovers and their simulation. The study contains structural elements as a PCB (printed circuit board) or 3D pattern and drawings of loudspeaker box. KEYWORDS
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