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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Support for efficient, scalable delivery of interactive multimedia services

Almeroth, Kevin C. 08 1900 (has links)
No description available.
22

A framework for distributed multimedia collaborations

Candan, Kasim S. January 1997 (has links)
Thesis (Ph. D.)--University of Maryland at College Park, 1997. / Includes bibliographical references (leaves 387-409).
23

Signal Processing Techniques for Mobile Multimedia Systems

Athanasiadis, Tasso, tas.atha@bigpond.net.au January 2007 (has links)
Recent trends in wireless communication systems show a significant demand for the delivery of multimedia services and applications over mobile networks - mobile multimedia - like video telephony, multimedia messaging, mobile gaming, interactive and streaming video, etc. However, despite the ongoing development of key communication technologies that support these applications, the communication resources and bandwidth available to wireless/mobile radio systems are often severely limited. It is well known, that these bottlenecks are inherently due to the processing capabilities of mobile transmission systems, and the time-varying nature of wireless channel conditions and propagation environments. Therefore, new ways of processing and transmitting multimedia data over mobile radio channels have become essential which is the principal focus of this thesis. In this work, the performance and suitability of various signal processing techniques and transmission strategies in the application of multimedia data over wireless/mobile radio links are investigated. The proposed transmission systems for multimedia communication employ different data encoding schemes which include source coding in the wavelet domain, transmit diversity coding (space-time coding), and adaptive antenna beamforming (eigenbeamforming). By integrating these techniques into a robust communication system, the quality (SNR, etc) of multimedia signals received on mobile devices is maximised while mitigating the fast fading and multi-path effects of mobile channels. To support the transmission of high data-rate multimedia applications, a well known multi-carrier transmission technology known as Orthogonal Frequency Division Multiplexing (OFDM) has been implemented. As shown in this study, this results in significant performance gains when combined with other signal-processing techniques such as spa ce-time block coding (STBC). To optimise signal transmission, a novel unequal adaptive modulation scheme for the communication of multimedia data over MIMO-OFDM systems has been proposed. In this system, discrete wavelet transform/subband coding is used to compress data into their respective low-frequency and high-frequency components. Unlike traditional methods, however, data representing the low-frequency data are processed and modulated separately as they are more sensitive to the distortion effects of mobile radio channels. To make use of a desirable subchannel state, such that the quality (SNR) of the multimedia data recovered at the receiver is optimized, we employ a lookup matrix-adaptive bit and power allocation (LM-ABPA) algorithm. Apart from improving the spectral efficiency of OFDM, the modified LM-ABPA scheme, sorts and allocates subcarriers with the highest SNR to low-frequency data and the remaining to the least important data. To maintain a target system SNR, the LM-ABPA loading scheme assigns appropriate signal constella tion sizes and transmit power levels (modulation type) across all subcarriers and is adapted to the varying channel conditions such that the average system error-rate (SER/BER) is minimised. When configured for a constant data-rate load, simulation results show significant performance gains over non-adaptive systems. In addition to the above studies, the simulation framework developed in this work is applied to investigate the performance of other signal processing techniques for multimedia communication such as blind channel equalization, and to examine the effectiveness of a secure communication system based on a logistic chaotic generator (LCG) for chaos shift-keying (CSK).
24

Kommunikationsarbeit in Online-Medien : zur beruflichen Entwicklung kommunikativer Erwerbstätigkeiten ; eine explorative Studie aus institutionentheoretischer Sicht /

Engels, Kerstin. January 2003 (has links) (PDF)
Univ., Diss.--Hamburg, 2003. / Literaturverz. S. 322 - 329.
25

Video coding for mobile communications : a motion-based approach

Al-Mualla, Mohammed Ebrahim January 2000 (has links)
No description available.
26

Massively parallel wavelet based video codec for an intelligent-pixel mobile multimedia communicator

Rassau, Alexander M. January 1999 (has links)
No description available.
27

The annotation of continuous media

Ferraz, Carlos Andre Guimaraes January 1995 (has links)
No description available.
28

Kaleidoscope : textual being and creative becoming in the translation of Chinese poetry

Fang, Grace Po-Ting January 2001 (has links)
No description available.
29

Dynamic throughput in distributed multimedia

Apteker, Ronnie T January 2016 (has links)
Personal computing is currently undergoing radical enhancements with the current technological advancements that have been made in the areas of high resolution displays, GUIs (graphic user interfaces), high quality sound and full motion video. Multimedia stands at the convergence of these technological advances. The pervasiveness of networks will result in a new generation of distributed services that include multimedia as the fundamental characteristic. The current hyper-activity in the commercial arena is testimony to the future of distributed mu1timedia services. The anticipation of the data superhighways has led to an industrial scramble filled with takeovers and acquisitions as companies battle to acquire the infrastructure that will set the scene for the services of the future. [Abbreviated Abstract. Open document to view full version] / GR 2016
30

Tendências e potencialidades da infografia multimédia em Portugal

Cardoso, Cátia Angelina Pinto January 2010 (has links)
Documento confidencial. Não pode ser disponibilizado para consulta / Tese de mestrado. Multimédia. Faculdade de Engenharia. Universidade do Porto, Faculdade de Letras. Universidade do Porto. 2010

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