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Stereo ADC and DAC converter for audio
Koiš, Christopher ; Polák, Ladislav (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor's thesis deals with the problem of designing a programmable digital sound processor with its input connected to a device, such as a personal computer or a mobile phone, and an output intended for headphones. One segment of this thesis handles digital filters, specifically FIR and IIR filters. The MATLAB environment was used to design the filters shown in this thesis. Furthermore, the buses SPI, I2C and I2S that are used on the device are described. The parameters of individual functional blocks are summarized, and the designed circuit schematic are displayed in this thesis. In the practical part of this thesis a prototype printed ciruit board was designed and its' electrical parameters were measured and processed. Finally, the last part of this thesis describes the inner workings of the program that the microcontroller executes.
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Precision datalogger and voltage signal source
Šafář, Pavel ; Matějka, Tomáš (referee) ; Kubíček, Michal (advisor)
This work deals with the design and construction of a precise device for voltage measurement, which at the same time enables the generation of a precise output voltage signal. The various effects of interference sources on accuracy and the possibilities of their elimination are discussed here. The selected solution concept is described. The work also deals with individual phases of development and explains the reasons for their modifications in different phases.
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Automatic testing of gas leak detector
Skryja, Petr ; Malinowski, Radim (referee) ; Novák, Marek (advisor)
This work deals with the automatic testing of an ultrasonic gas leak detector, which has to be tested during normal changes in the development phase. The reader will be acquainted with the basic principles of gas detection, design of the test product, software architecture its implementation. The following is a presentation of the application and instructions for writing tests. In this work, the Beaglebone Black development board with the Debian operating system is used as the core of the entire test product.
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SELinux application for Linux server security
Jirka, Michal ; Pelka, Tomáš (referee) ; Šimek, Milan (advisor)
This work is engaged in access control mechanism in GNU/Linux operating systems. At first discretionary and mandatory access control are compared and examine basic technologies based on mandatory access control. More closely is focused on project SELinux, whose generation of new rules is explained. Within the thesis is made application for logging evaluation and for writing new Type Enforcement rules.
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Communication assembly for optical cableless linking
Kapuš, Martin ; Kovář, Jan (referee) ; Kolka, Zdeněk (advisor)
This Graduate Thesis is about communication module for optical wireless network. This device read data from RS232 port and two analog inputs and sends it through internet to a remote Computer. Furthermore allows voice communication between local user on module and user on remote computer. Device allows communication with standard headphones and microphone, or with Bluetooth handsfree. Basic part is microprocessor MCF5223 and Bluetooth Ezurio BISM II module. Control program has been written in C language. Printed circuit is created by EAGLE program. This device is managed via web interface and settings have been stored into EEPROM memory. Work contains description of separately parts and blocks, source code of program, description of source code and printed circuit designs.
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Function Generator with the Android Operating System
Neradilková, Aneta ; Čmiel, Vratislav (referee) ; Sekora, Jiří (advisor)
Function generators are equipments that generate a wide range of waveforms. This bachelor’s thesis introduces the function generator and Arduino platform. On the basis of familiarity with the function generator and the Arduino platform is designed proposal generator using Arduino kit and draft flowchart for generating four waveforms. This proposal is implemented and describes the different parts of the generator, hardware and software. The functionality of the generator is tested using an oscilloscope.
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Microcontroler based ECG Generator
Bureš, Michal ; Bubník, Karel (referee) ; Sekora, Jiří (advisor)
This thesis deals with the generation of an ECG signal and options how to generate a physiological or a pathological signal using the microprocessor. On the basis of the studied methods for generating signal was used the graphic method, using the table values to describe the an individual waves contained in the ECG signal. Bacherol’s thesis solves a design of the individual parts that are needed to realization the genererator. These parts are a block diagram, a system design and a flowchart. On the basis of a design is constructed and programmed function ECG signal generator.
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Design of low order high OSR discrete time delta-sigma modulator for audio applications
Dohnal, Jaroslav ; Kledrowetz, Vilém (referee) ; Háze, Jiří (advisor)
Tato diplomová práce si klade za cíl seznámit čtenáře se základním konceptem a principy jednosmyčkových modulátorů . Diplomová práce ozřejmuje čtenáři problematiku delta-sigma () modulátorů s jednou zpětnovazební smyčkou. Zabývá se základními principy převzorkování u číslicově-analogových převodníků a rozšiřuje je o teorii tvarování spektra šumu. Vycházeje z této teorie jsou navrženy tři jednosmyčkové modulátory, které běží na 1024 OSR jako alternativa k běžně používáným modulátorům vysokých řádů. Modulátory jsou implementovány do FPGA společně s rekonstrukčním filtrem a podpůrnými bloky. Nakonec byl zkonstruován hardwarový prototyp pro vyhodnocení implementace navrženého DAC.
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Laboratory Pulse Power Supply Controlled by Microcontroller
Chytil, Jiří ; Kubíček, Michal (referee) ; Šebesta, Jiří (advisor)
This project deals with design of switching laboratory supply controled by PIC microcontroler. It consist of three modules: control unit and couple of power modules. Each of the modul is controled by PIC18 microcontroler. Device should work autonomicaly or it can be connected with PC via USB. Output paremeters 0-20 V, 0-1 A. The device has been designed with regard to minimal power consumption.
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HiFi DA Converter with Integrated Headphone Amplifier
Doležal, Pavel ; Jaroš, Jiří (referee) ; Šimek, Václav (advisor)
This thesis is dealing with a design and fabrication of D/A coverter and headphone amplifier for stereo reproduction in Hi-Fi class. In opening chapter, overall problematics of digital audio signal distribution is discussed. Following chapters are dedicated to converter design, communication protocols, component selection, converter production, circuitry design and firmware programming. The final chapter is dealing with expansion options such as HDMI inputs and surround sound.
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