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Image compression in interactive applications in digital video broadcasting
Bodeček, Kamil ; Vrba, Kamil (advisor)
Compressed images are used very frequently in interactive applications in digital video broadcasting. New methods increasing efficiency of the image transmission in digital video broadcasting networks are proposed. Adaptive spatial filtering methods have been proposed for enhancement of the visual perception of the compressed images. New optimalization method is based on application of the filtering algorithms on more compressed images (data size are reduced). Visual quality enhancement is processed in interactive application. Further, new compression methods JPEG2000 and H.264 for image compression have been analysed. Novel compound image compression method for standard and high spatial television resolution is proposed in the thesis.
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Simulation of the DVB-T digital modulation in Matlab
Málek, Pavel ; Říčný, Václav (referee) ; Kratochvíl, Tomáš (advisor)
Digital Video Broadcasting (standard DVB) is a system for transmission of the television signals in the digital form. There are used a various types of modulations in this system as QPSK modulation is used in the systems of satellite video broadcasting DVB-S (Satellite) and M-QAM modulations in the cable transmitting DVB-C (Cable). This paper mainly deals with system of the terrestrial digital video broadcasting DVB-T (Terrestrial), where OFDM modulation is used. This type of signal processing is more resistant to the distortions caused by multipath transmitting, which is main problem in the DVB-T. Matlab application, which can simulate digital modulation and demodulation of the transmission signals in the DVB-T, is created in this thesis. The models of the transmission channel is inserted between structures of modulator and demodulator. The user of this application can set the parameters of the broadcasting (e.g. constellation, OFDM mode, guard interval insertion) and the type of distortions (additive noise, reflected and delayed signals). By calculation of the channel bit error rate (BER) user can study influences of broadcasting parameters to the quality of transmission.
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Digital television transition in the United states
Boch, Vítězslav ; Štoll, Martin (advisor) ; Křemen, Pavel (referee)
This thesis describes digital television transition in the United States. Its goal is to introduce the way how digital television broadcasting in the United States was formed and analog broadcasting was switched off, and how these changes affected American television market and usage of broadcasting spectrum. In the first part I explain a context in which American television market has been formed and has developed until the beginning of 1990s, when the debate about digital television broadcasting commenced. Reason for a development of the new television norm was a desire to broadcast in high definition. Establishment of ATSC norm is explained in 4th chapter. Following chapter describes how digital television coverage grew and what the expenses were for viewers. The thesis then describes spectrum auctions and changes in the television market which digital television transition brought. When the transition ended need for a new debate about television emerged because current norm is becoming obsolete and did not allow broadcasting in ultra high definition. This lead to the development of ATSC 3.0 norm which allows broadcasting more programs in terrestrial television broadcasting and allows expanding terrestrial broadcasting to other mobile devices.
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Benefits of digitizacion of television broadcasting in the diversity of programme content in the Czech republic
Fiala, Adam ; Kruml, Milan (advisor) ; Bednařík, Petr (referee)
Diploma thesis examines the form of television market in the age of digitalized terrestrial broadcasting with regard to the extent to which there can be found genre innovations, wider scale of origin countries and the placement of its own or foreign programme premieres. For this purpose, it concentrates on eight new digital channels distributed in terrestrial network; available nationwide, not monothematic and having audience share of at least around one percent. In the theoretical part, there is briefly summarized the history of the digitalization process in the Czech Republic, there are profiles of examined TV channels and thesis also presents extinct or minor digital channels shortly. For research purpose, thesis uses quantitative analysis methodology; it allows to explore larger amount of materials and achieve the general knowledge. The results consist of the comparison between the eight channels in three categories, description of the evolution of programme in the course of the time compared to the first month of broadcasting and contextual contrast using partial analysis of broadcasting of main and then only analogue available channels . The major positive aspect of the new channels is a higher degree of ambiguity genre. However, U.S. still holds important role as origin country of the programmes.
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Image compression in interactive applications in digital video broadcasting
Bodeček, Kamil ; Vrba, Kamil (advisor)
Compressed images are used very frequently in interactive applications in digital video broadcasting. New methods increasing efficiency of the image transmission in digital video broadcasting networks are proposed. Adaptive spatial filtering methods have been proposed for enhancement of the visual perception of the compressed images. New optimalization method is based on application of the filtering algorithms on more compressed images (data size are reduced). Visual quality enhancement is processed in interactive application. Further, new compression methods JPEG2000 and H.264 for image compression have been analysed. Novel compound image compression method for standard and high spatial television resolution is proposed in the thesis.
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Simulation of the DVB-T digital modulation in Matlab
Málek, Pavel ; Říčný, Václav (referee) ; Kratochvíl, Tomáš (advisor)
Digital Video Broadcasting (standard DVB) is a system for transmission of the television signals in the digital form. There are used a various types of modulations in this system as QPSK modulation is used in the systems of satellite video broadcasting DVB-S (Satellite) and M-QAM modulations in the cable transmitting DVB-C (Cable). This paper mainly deals with system of the terrestrial digital video broadcasting DVB-T (Terrestrial), where OFDM modulation is used. This type of signal processing is more resistant to the distortions caused by multipath transmitting, which is main problem in the DVB-T. Matlab application, which can simulate digital modulation and demodulation of the transmission signals in the DVB-T, is created in this thesis. The models of the transmission channel is inserted between structures of modulator and demodulator. The user of this application can set the parameters of the broadcasting (e.g. constellation, OFDM mode, guard interval insertion) and the type of distortions (additive noise, reflected and delayed signals). By calculation of the channel bit error rate (BER) user can study influences of broadcasting parameters to the quality of transmission.
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