Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 1998. / Includes bibliographical references.

Thesis (Ph. D.)--University of California, San Diego, 2000. / Vita. Includes bibliographical references (leaves 212-232).

Orientador: Yuzo Iano / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-19T03:10:19Z (GMT). No. of bitstreams: 1 LeonRuiz_JulioHumberto_M.pdf: 2376672 bytes, checksum: 1993d7f97b27f20af58d196c57892d90 (MD5) Previous issue date: 2011 / Resumo: No entorno atual da televisão digital no Brasil, a interatividade é uma característica importante para se estabelecer uma plataforma de comunicação entre os usuários e as emissoras. O middleware Ginga, ainda em desenvolvimento, se apresenta como uma oportunidade para a interatividade por meio do Ginga-NCL, um framework que permite o desenvolvimento de aplicações usando as linguagens NCL e Lua. Porém, as formas de se implementar aplicações não são padronizadas, uma vez que os receptores no mercado são limitados em hardware e as aplicações nem sempre poderão ser executadas sem seguir algumas regras ou restrições para se otimizar as aplicações. Este trabalho oferece uma nova perspectiva sobre o desenvolvimento de gráfico de aplicações interativas, com técnicas para se otimizar os parâmetros limitantes, além de uma biblioteca de código aberto para se implementar um teclado virtual em qualquer aplicação Ginga-NCL / Abstract: Interactivity for digital television is, nowadays, a very important feature to stablish a communication pathway between users and broadcasters, due to digital television's current status in Brazil. The Ginga middleware, still in development status, presents an opportunity for achieving interactivity via Ginga-NCL, a framework that allows application development and deployment using NCL and Lua programming languages. However, there are not standardised ways to develop applications, the currently available receivers in the market are very limited in hardware, and released applications will not be able to always execute flawlessly without standards or guidelines to optimise them. The author's work offers a new perspective on graphical environment development for interactive applications with techniques to optimise against the limiting factors, and presents an open-source library for implementing a virtual keyboard in any Ginga-NCL application as well / Mestrado / Telecomunicações e Telemática / Mestre em Engenharia Elétrica

Thesis (M.A.)--University of North Texas, Aug., 2007. / Title from title page display. Includes bibliographical references.

With the increasing demand for high quality TV service, digital television (DTV) is replacing the conventional analog television. DTV tuner is one of the most critical blocks of the DTV receiver system; it down-converts the desired DTV RF channel to baseband or a low intermediate frequency with enough quality. This research is mainly focused on the analysis and realization of low-cost low-power front-ends for ATSC terrestrial DTV and DVB-H mobile DTV tuner systems. For the design of the ATSC terrestrial tuner, a novel double quadrature tuner architecture, which can not only minimize the tuner power consumption but also achieve the fully integration, has been proposed. A double quadrature down-converter has been designed and fabricated with TSMC 0.35µm CMOS technology; the measurement results verified the proposed concepts. For the mobile DTV tuner, a zero-IF architecture is used and it can achieve the DVB-H specifications with less than 200mW power consumption. In the implementation of the mobile DVB-H tuner, a novel RF variable gain amplifier (RFVGA) and a low flicker noise current-mode passive mixer have been proposed. The proposed RFVGA achieves high dynamic range and robust input impedance matching performance, which is the main design challenge for the traditional implementations. The current-mode passive mixer achieves high-gain, low noise (especially low flicker noise) and high-linearity (over 10dBm IIP3) with low power supplies; it is believed that this is a promising topology for low voltage high dynamic range mixer applications. The RFVGA has been fabricated in TSMC 0.18µm CMOS technology and the measurement results agree well with the theoretical ones.

Made available in DSpace on 2014-06-11T19:24:05Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-12-15Bitstream added on 2014-06-13T20:11:53Z : No. of bitstreams: 1 souza_mf_me_bauru.pdf: 924514 bytes, checksum: fc6fc7456598bdead95d5d9d52d981b8 (MD5) / Universidade Estadual Paulista (UNESP) / O presente trabalho teve por finalidade desenvolver um protótipo de conteúdo educativo utilizando os recursos da TV Digital Interativa. No texto, são apresentadas as características da televisão digital interativa aberta como meio complementar para a educação. A metodologia utilizada é composta de quatro fases: dedução, análise, indução e síntese. Sua concepção toma como problema a necessidade expressa pela Unesco sobre o uso das Tecnologias de Informação e Comunicação (TICs) para a educação, bem como a possibilidade de aplicação da televisão digital em um processo educativo. O conteúdo é estruturado em formato de quiz, um tipo de jogo de perguntas e respostas utilizado como meio de educação não formal a alunos de ensino médio. O protótipo desenvolvido nesse trabalho é apresentado como roteiro e mapa estrutural, levando em conta as atividades e rotinas necessárias para seu funcionamento nos ambientes testados, eclipse, virtual set-top-box e Developer Box. As práticas de prototipação foram realizadas em NCLua, tendo como base o middleware Ginga. Como resultado, avalia-se que, de fato, o Ginga ofereceu suporte suficiente para realizar a tarefa, proporcionando características de interação para veiculação do conteúdo proposto, no momento da prática real / This work had as objective the development of a prototype of educational content, as an experimental process, making use of resources from the interactive digital TV. The characteristics of interactive digital terrestrial television are presented, in the form of a media mode capable of performing as a complementary source to eduation. The methodology used is composed of four phases: deduction, analysis, induction and synthesis. Its conception. Takes as issue the expressed need stated by UNESCO to use ICT (information and Comunications Technology) towards education, as well as the possibility of applying digital television in an educational process. The content is structured in the form of a quiz, a type of question-answer game as an informal way of education for high school students. The prototype developed in this work is presented as a structural script and map, taking into account the necessary activities and routines to put it into operation in the tested environments, eclipse, virtual set-top-box and Developer Box. The practice of prototyping was carried out in NCLua, based on middleware Ginga. As a result, we concluded that Ginga ofters enough support to carry out the task, providing characteristics of interaction to publish the proposed content, at the moment of the actual practice

No description available.

Still image and image sequence compression plays an important role in the development of digital television. Although various still image and image sequence compression algorithms have already been developed, it is very difficult for them to achieve both compression performance and coding efficiency simultaneously due to the complexity of the compression process itself. As a results, improvements in the forms of hybrid coding, coding procedure refinement, new algorithms and even new coding concepts have been constantly tried, some offering very encouraging results.In this thesis, Block Adaptive Classified Vector Quantisation (BACVQ) has been developed as an alternative algorithm for still image compression. It is found that BACVQ achieves good compression performance and coding efficiency by combining variable block-size coding and classified VQ. Its performance is further enhanced by adopting both spatial and transform domain criteria for the image block segmentation and classification process. Alternative algorithms have also been developed to accelerate normal codebook searching operation and to determine the optimal sizes of classified VQ sub-codebooks.For image sequence compression, an adaptive spatial/temporal compression algorithm has been developed which divides an image sequence into smaller groups of pictures (GOP) using adaptive scene segmentation before BACVQ and variable block-size motion compensated predictive coding are applied to the intraframe and interframe coding processes. It is found the application of the proposed adaptive scene segmentation algorithm, an alternative motion estimation strategy and a new progressive motion estimation algorithm enables the performance and efficiency of the compression process to be improved even further.Apart from improving still image and image sequence compression algorithms, the application of parallel ++ / processing to image sequence compression is also investigated. Parallel image compression offers a more effective approach than the sequential counterparts to accelerate the compression process and bring it closer to real-time operation. In this study, a small scale parallel digital signal processing platform has been constructed for supporting parallel image sequence compression operation. It consists of a 486DX33 IBM/PC serving as a master processor and two DSP (PC-32) cards as parallel processors. Because of the independent processing and spatial arrangement natures of most image processing operations, an effective parallel image sequence compression algorithm has been developed on the proposed parallel processing platform to significantly reduce the processing time of the proposed parallel image compression algorithms.

Thesis (M.A.)--Kutztown University of Pennsylvania, 2000. / Source: Masters Abstracts International, Volume: 45-06, page: 2707. Typescript. Abstract precedes thesis title page as [2] preliminary leaves. Copy 2 in Main Collection. Includes bibliographical references (leaves 108-115).

Thesis (M.S.)--Ohio University, August, 1988. / Title from PDF t.p.