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Comparison of compression algorithms for high definition video
Dvořák, Martin ; Polák, Ladislav (referee) ; Slanina, Martin (advisor)
Bachelor's thesis deals with comparison and analysis of various instruments of the present-day compression algorithms used to compress high-definition video. Video sequences require a large amount of memory for their storage and take up bandwidth for their transmission, so it is necessary to compress video signals with regard to the quality of video after decompressing. The work focuses mainly on the differences between the algorithms and overall performance. Part of this work is a compressed video database, comparing the performance of different algorithms and the subjective quality of compressed video.
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DDS waveform generator
Čada, David ; Tejmlová, Lenka (referee) ; Šebesta, Jiří (advisor)
This project deals with design and realization of the function generator using a direct digital synthesis. This work solves hardware and software of the function generator, which is capable to generate following shapes: sine, trialngle, square with variable duty cycle, pulse width modulation, frequency shift keying, pulse, linear frequency sweeping, logaritmic frequency sweeping, and programable signals of a serial peripherial interface.
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Precise function generator
Snopek, Petr ; Horský, Pavel (referee) ; Kolka, Zdeněk (advisor)
The aim of the project is to design a concept of function generator with digital synthesis. The device will be controlled using microprocessor which allows synthesizing basic functions (sin, square, raw) as well as arbitrary functions stored in memory. User friendly graphical interface will be controlled by keyboard and rotary switch (IRC). The work emphasizes correct selection of DDS clock source, circuit elements and proper application of signal filtration method with attention to low distortion and low output phase noise.
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Direct digital frequency synthesizer with external synchronizing
Buš, Ondřej ; Viščor, Ivo (referee) ; Kasal, Miroslav (advisor)
This thesis deals with problematics of direct frequency digital synthesis. Principle and basic characteristics of this method of signal generating are explained in the introduction. It considers impact on purity of spectrum of output signal. Next chapter considers conception of the generator, namely choice of DDFS circuit and other basic blocks. Design of frequency multiplier, reconstruction filter and power amplifier are included. It also deals with choice of control circuit. The device is controlled by computer through USB. There was created user programme for this purpose. Measured characteristics are stated at the end of the work. This work includes schemes of connetions of designed parts including simulations and measured parameters.
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Audio D/A converter used for laboratory measurements
Abrman, Milan ; Stifter,, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
The aim of this thesis is design stereo digital to analog convertor for school laboratory usage. Scope of the thesis covers the design of all the functional units: input signal circuit, S/PDIF receiver, D/A converter, high quality analog output stage with active low pass filter. Thesis also cover design of all control and indicating parts containing microcontroller with control parts, alphanumeric OLED display and setting indicators.
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Digital Mixing Console
Přibyl, Libor ; Krajsa, Ondřej (referee) ; Kubánek, David (advisor)
The presented work deals with the issue of digital mixing console. The main focus is on the design of sub-circuits for the digital mixer and the construction into the 19 "rack unit. The thesis presents a detailed description of individual parts and their use. Thesis also includes complete device designs, including a power supply and additional circuits.
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Programmable signal generator connected via USB
Patočka, Lukáš ; Krajsa, Ondřej (referee) ; Lattenberg, Ivo (advisor)
The subject of this thesis is design and construction of a periodic signal generator prototype. The generator will use Atmel XMEGA128A4U microcontroller with computer control managed via USB interface. The thesis contains general solutions to the problem of generating signals with a special focus on utilization of DA converter – digital synthesis and reconstruction of the signal from DA converter output to continuous signal. The thesis further deals with implementation of the USB layer using two libraries (LUFA library on microcontroller side and LubUsbDotNet library on computer side). The final solution will include DC step-up converter for signal peak amplitude assessment and summing amplifier for adding the DC voltage to the output signal. The application will allow for generating signals of various shapes including user-defined ones. These signals will be displayed in the actual application window. There, users will be allowed to create user-defined signal in easy-to-use GUI or load it directly from a file.
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Audio ADC and DAC for laboratory measurements
Raszka, Dan ; Frýza, Tomáš (referee) ; Kratochvíl, Tomáš (advisor)
This paper describes the design of a laboratory equipment to demonstrate the influence of the sampling frequency and quantization errors on converter. Part of this work is to select appropriate ADC and DAC along with control microprocessor. The proposal contains other functional blocks such as analog input and output filters, LCD display and controls. It deals also with the design of software solutions to control and signal processing.
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Digital Mixing Console
Přibyl, Libor ; Krajsa, Ondřej (referee) ; Kubánek, David (advisor)
The presented work deals with the issue of digital mixing console. The main focus is on the design of sub-circuits for the digital mixer and the construction into the 19 "rack unit. The thesis presents a detailed description of individual parts and their use. Thesis also includes complete device designs, including a power supply and additional circuits.
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DDS waveform generator
Čada, David ; Tejmlová, Lenka (referee) ; Šebesta, Jiří (advisor)
This project deals with design and realization of the function generator using a direct digital synthesis. This work solves hardware and software of the function generator, which is capable to generate following shapes: sine, trialngle, square with variable duty cycle, pulse width modulation, frequency shift keying, pulse, linear frequency sweeping, logaritmic frequency sweeping, and programable signals of a serial peripherial interface.
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