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DAC converter for CD/DVD player
Vomočil, Vojtěch ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
Bachelor thesis deals with the design and construction of D/A converter used in the area of audio signals with digital interface SPDIF. In the theoretical part of the thesis the design of block structure of the D/A converter module is included with assumption on realization by receiver of the digital signal Cirrus Logic CS8414 and D/A converter CS4334. In the practical part of the thesis the detailed wiring scheme of D/A converter, printed circuit board design, parts layout and construction design for implementation are presented. In the experimental part of the thesis the functionality of the D/A converter is tested and verified including the measurement results. Measured results are presented in the form of standard protocol. D/A converter can be used as stand alone module and connected to CD or DVD player. At the converter outputs audio amplifier and speakers can be connected.
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Digital AM / FM transmitter
Kováč, Marek ; Strašil, Ivo (referee) ; Pavelka, Ondřej (advisor)
This master thesis is focused on the theoretical description and practical implementation of software defined transmitter. The main aim of this thesis was made the prototype of software defined transmitter in FM band. Theoretical part is determined to description of basic parts of equipment and working principles to understand the basic principle of digital transmitters and define the appropriate component base for construction. Discussed are used types of A/D and D/A converters, blocks of digital signal processing and the roles, which these components performs. The second part is focused practical. Specified are suitable types of components and block diagram is proposed for following electrical connection and printed circuit board in Eagle program as a plug-in modul for developmental platform Arduino. The main point is program, which sets and controls the transmitter. Next important part is impedance match and antenna tuning, which is explain in practical part of thesis. The result is prototype of software defined transmitter compatible with Arduino Uno platform.
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Adaptable video A/D converter
Maňas, Stanislav ; Hála, Ondřej (referee) ; Říčný, Václav (advisor)
Master's Thesis deals with the complete proposal of light adaptability A/D converter. In the second chapter there are describes types of sensors. Third one describes the most used methods of light adaptability. In the fourth chapter there is describe the adaptability A/D conversion. Chapter 5 describes the block diagram. In the sixth chapter there is the design of all blocks of A/D converter. Finally in the chapter 7 there are construction documents for realization.
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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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Implementation of the I2S Driver into the Freescale MQX RTOS
Možný, Karel ; Hynčica, Ondřej (referee) ; Kučera, Pavel (advisor)
This thesis deals with design and development of a I2S module driver for real-time operating system MQX running on a ColdFire V4 architecture based processor. Further there are presented circuit diagrams and PCBs created for testing of functions and properties of the driver. Signal input is a digital audio in form of S/PDIF interface, output is an analogue signal, that can be listened by the means of a headphone amplifier. The conclusion describes a sample application demonstrating function of the driver on developed hardware.
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Universal Microcontroller Unit
Kulenda, Vít ; Hynčica, Ondřej (referee) ; Kučera, Pavel (advisor)
Master’s thesis contains description parameters of microcontroller ATMEGA644P, also contains differences between older and newer version of microcontrollers ATMEGA644 and ATMEGA644PA. Inside structure of microcontroller, memories and peripherals are described here. The construction of the universal microcontroller unit is main target of this thesis. The unit contains supply, A/D converter, current loop, communication interfaces, temperature sensor, accelerometer and other. The unit collects and saves data, communicates by interfaces and manages other functions. Using devices and circuits are described in this thesis. Development of software for microcontroller(firmware) are positioned to last part of this thesis. This software control functions of all parts positioned on the unit.
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Modulated signal generator
Melša, Ondřej ; Poměnka, Petr (referee) ; Maršálek, Roman (advisor)
This project occupies with the creation modulated signal generator in MATLAB. There are explicit basic princips of modulation PSK, M-QAM, princip of system with spread spektrum and princip of access OFDM and MC-CDMA. Next there are explicit basic parametres and possibilities configuration of conversion analog PCI card CompuGen 4302, which serves as D/A convertor of signals created by PC.
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Digital controlled power supply
Kocián, Daniel ; Koton, Jaroslav (referee) ; Šotner, Roman (advisor)
This master’s thesis is about design and realization of a digital controlled power supply. In the introduction there is defined a basic princip and division of the power supplies. Furthermore, there are considered two design realisations of digital controlled power supllies. The first one will be controlled by D/A converter and the second one will be controlled by digital potentiometers. Consequently, there is in the master’s thesis designed controlled part which controls output parameters of supply. The core of the controlled part is microcontroller ATmega16. Output parameters are displayed on LCD display and are set by 4x4 matrix keypad. In the last part there is designed connection between PC and microcontroller by the help of converter FT232BM. Subsequently, there is designed the rectifier with a filter and electronic switching of the fan. At the end of the thesis is resolved the placement of the various component parts to the component box.
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Precise Frequency Generator - DDS
Kratochvíl, Petr ; Vágner, Petr (referee) ; Baran, Ondřej (advisor)
This work deals with frequency generators based on the direct digital synthesis method DDS. Basic principles and attributes of the frequency generator DDS are explained. The text describes parameters influencing and defining a quality of the generated signal. The list of available integrated circuits realizing the direct digital synthesis is mentioned. A construction of the DDS generator with a device AD9954 and the generator control are described. At the end of the work, the function and parameters of the designed generator are verified.
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Implementation of software radio into FPGA
Šrámek, Petr ; Maršálek, Roman (referee) ; Prokeš, Aleš (advisor)
The common objective of this project is implementation of software defined radio (SDR) into FPGA. The text contains review and comparison of several hardware concepts intended for SDRs implementation then the methods for digital implementation of various components of radios as the filters, mixers and others are mentioned. Part of the text introduces used hardware platform and describes software support for designing, simulations and implementation into hardware. Significant part of project describes complex of external hardware components as filter, amplifier and control panel designed and built within the project realization. But the main part of project demonstrates design of the software solution of radio receiver. There is specified architecture of radio for FM broadcast receiving, next the more complex systems with carrier recovery algorithm are presented. These systems are able to work with AM, BPSK and QPSK modulations. It is possible to implement all these receivers into hardware and verify their operation. The practical laboratory theme has been outlined within the project run.
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