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Error protection of data transmission using BCH Codes
Kašpar, Jaroslav ; Křivánek, Vítězslav (referee) ; Němec, Karel (advisor)
The thesis Data transmission error-protection with BCH codes deals with a large class of random-error correcting cyclic codes which are able to protect binary data and can be used for example in data storages, high speed modems. Bose, Chaudhuri and Hocquenghem (BCH) codes operate over algebraic structures called Galois fields. The BCH encoding is the same as cyclic encoding and can be done with linear feedback shift register but decoding is more complex and can be done with different algorithms - in this thesis there are two algorithms for decoding Peterson and Berlekam-Massey mentioned. The aim of this thesis is to find BCH code which is able to correct t = 6 independent errors in up to data sequence n = 150 bits, then peruse possible realizations of the codecs and set criteria for the best realization, then design and test this realization. This thesis is split into three main parts. In the first part there are encoding and decoding methods of the BCH code generally described. The second part deals with selecting of the right code and realization. There was chosen BCH (63,30) code and realization with FPGA chip. In the last part is described design of BCH encoder and decoder and compilation in the Altera design software.
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Sound Module for Evaluation Kit
Priškin, Jiří ; Číž, Radim (referee) ; Sysel, Petr (advisor)
This thesis is dealing with design and putting into operation of sound module for evaluation kit Atmel ATSTK1000. At the beginning, there is an introduction with properties, hardware and software equipment of the evaluation kit which is used for development of embedded devices based on AT32AP7000. The microcontroller AP7000 is a complete system on chip with an AVR32 microprocessor core, containing additional supporting circuits, controllers and interfaces which the core itself does not have included. However, there is no digital to analog converter for audio signal processing. This has led to design an additional module performing this task. A part of thesis describes Intel AC‘97 standard including AC-link interface, which is used for full-duplex data transmission between realized sound module and the evaluation kit STK1000. The sound module is designed as a plug-in card. The last chapter presents the Linux operating system installation process as an SD/MMC Flash memory card boot image creation and test of the sound module under ALSA architecture.
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Analysis of open format videocodecs
Svoboda, Jaroslav ; Truhlář, Filip (advisor) ; Mezuláník, Radek (referee)
Hypothesis of this thesis states that even though open format codecs are available for free, they are equal alternative to the patented ones. This was verified by set of objective tests. Quality of videos was measured by PSNR and SSIM methods firstly on HD 8-bit sequences with various framerate encoded by Theora, VP8, VP9, H.264 and H.265. Afterwards were codecs tested on 4K 10-bit sequence encoded by coding standards H.264, H.265 and VP9 codec to see how they will perform in future usage in UHD content distribution. Last test shows computational demands and quality in fast encoding mode. Thesis also includes overview of each codec support by ICT devices, which is not as wide as H.264's but is raising.
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FLASH-video streaming technology
ZEZULA, Jiří
The document is about flash streaming in all its forms. Its main component is the comparison and define the characteristics of flash streaming servers in a comeretional and open-source form. Space will also be devoted to codecs that servers use.
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Streaming and format converting
MRÁZ, Jan
The theoretical part of this project covers direct video presentation over internet in the form of streaming with special emphasis on video conversion. It explains all parameters that are characteristic for streaming technology and assesses techniques for comparing visual quality available to date. The practical part of this project focuses on empirical measurements of the quality of generated video files using group of subjects with simultaneous mathematical comparssion of difference between recoded video and the original.
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Video in the Web 2.0
Fišera, Martin ; Pavlíček, Antonín (advisor) ; Vlach, Jiří (referee)
This Bachelor work deals with video, Web 2.0 and their reciprocal relation. Whereas it is a very complex topic the first chapter focuses on introduction to the issue of video, characteristics of video and connected technologies. It deals with conceptions as data stream, resolution, colour, depth of colour, interleaving, compression, multimedia containers and so on. There is a brief comment on issues of audio compression at the end of the first chapter. The second chapter follows video and Web 2.0 interconnection where the intersection of video and the internet is described and consequently there is a transition to the conception of Web 2.0 and its historical delimitation and definition. The notion of streaming occurs there for the first time there and is further analysed on a network layer as well as on an application layer. The last third chapter deals with social aspects of streaming services as YouTube, Stream.cz and others. This chapter tries through the pondering to refer to the fact that streaming services are not determinate by only technological elements but also social effects which act on users of these services.
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Video Market at the Internet Era
Pavlovský, Roman ; Jandoš, Jaroslav (advisor) ; Šedivá, Zuzana (referee)
The Video Market at the Internet Era thesis focuses on possible ways to distribute a digital video to a viewer with the respect to increasing importance of the Internet. It focuses on technical aspects of different distribution routes and looks at distribution channels from the economic perspective. Gained technological knowledge is used for the analysis of the digital video market on the Internet, which is aimed at both existing subjects in the digital video market and the new emerging ones, thanks to the Internet, as well. One of the other lesser objectives of this work are to introduce is the copyright issue. The final chapter assesses the current state of the market and makes predictions of the state and trends in the use of the digital video and understanding the copyright. The terms used in the work are always explained in the respective chapter and therefore advanced knowledge of the technologies described there is not required.
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Problems of creating digital video
Batík, Lukáš ; Šedivá, Zuzana (advisor) ; Pavlíčková, Jarmila (referee)
The objective of this document is to analyse the process of creating video presentation. This work should deal with specific technologies of video recording (PAL, NTSC, Film), contemporary post-processing trends and it will also discuss posibilities of its distribution throw the internet. The document is divided into two parts -- the theoretical and the practical part. The first mentioned includes the scheme of the video making process, which is followed by description of each step enhanced with various technical styles of project processing. This should emphasize the variability of possibilities in filming and also the fact, that there is not only one correct way of processing the project, for diverse projects demand selection of specific mix of variants. In the practical part concrete project will be processed -- I compose a video presentation for the Faculty of Informatics and Statistics of the University of Economics in Prague.
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Technology and use of digital video
Pechar, Zdeněk ; Pavlíček, Antonín (advisor) ; Nekvasil, Marek (referee)
This work puts several aims, whereas the main aim is to afford to the reader an overview of field of digital video. To attend the main aim, we will use a few smaller aims, which show us digital video from many views. At the opening we will study the technology of digital video and we will have look on its short history. We will show to ourselves the types of video mediums including video tape war. We will have a look on some problems and limitations with video playing and also video compressions will be shown. A part of work devote to video formats and problems with playing compatibility. In another part we can read about using digital video and its running thought the society. This work, last but not least, introduce the ways of video distributing. The next small aim of the work is to clear up digital rights and its management. We will also make basic view, how law solve digital rights. We will see prediction in field of digital video and its usage in the final of the work. The manner in which this work is presented does not require reader's deep previous knowledge of the technologies here described.
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