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Publications of Wolfgang Effelsberg

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  • Wolfgang Effelsberg und Eberhard Müller-Menrad. ICSI, Technical Report / International Computer Science Institute. 1993 Dynamic Join and Leave for Real-Time Multicast Berkeley, CA, . 93-056
  • Bernd Hofmann und Wolfgang Effelsberg. , Technical Reports. 1993 Efficient Implementation of Estelle Specifications Mannheim, . 93-003
    Efficient implementation of communication software is of critical importance for high-speed networks. We analyze performance bottlenecks in existing implementations and propose two techniques for improvements: The first exploits parallelism not only in the actions of the FSMs, but also in the runtime system of the protocol stack. The second integrates adjacent layers leading to considerable savings in inter-layer interface handling and in the number of transitions occurring in the FSMs. Both techniques are discussed in the context of OSI upper layers, and are based on protocol specification in Estelle.
  • Ralf Keller und Wolfgang Effelsberg. , Arbeitspapier / Reihe Informatik. 1993 MCAM: An Application Layer Protocol for Movie Control, Access, and Management Mannheim, . 93-01
    Most of the recent work on distributed multimedia systems has concentrated on the transmission, synchronization and operating system support for continuous media data streams. We consider the integrated control of remote multimedia devices, such as cameras, speakers and microphones, to be an important part of a distributed multimedia system. In this paper we describe MCAM, an application layer architecture, service and protocol for Movie Control, Access, and Management in a computer network. The OSI Reference Model is our framework. We present the protocol data units and the Finite State Machine for our application protocol and outline the automatic generation of the implementation code for layer 7 from our formal specification. MCAM allows complete and integrated control of movie data streams and devices in a heterogeneous multimedia network.
  • Ralf Keller, Wolfgang Effelsberg und Bernd Lamparter. , Technical Reports. 1993 Performance Bottlenecks in Digital Movie Systems Mannheim, . 93-007
    Digital movie systems offer great perspectives for multimedia applications. But the large amounts of data involved and the demand for isochronous transmission and playback are also great challenges for the designers of a new generation of file systems, database systems, operating systems, window systems, video encoder/decoder and networks. Today's research prototypes of digital movie systems suffer from severe performance bottlenecks, resulting in small movie windows, low frame rates or bad image quality (or all of these!). We consider the performance problem to be the most important problem with digital movie systems, preventing their widespread use today. In this paper we address performance issues of digital movie systems from a practical perspective. We report on performance experience gained with the XMovie system and new algorithms and protocols to overcome some of these bottlenecks.
  • Bernd Lamparter, Otto Böhrer, Wolfgang Effelsberg und Volker Turau. , Technical Reports. 1993 Adaptable Forward Error Correction for Multimedia Data Streams Mannheim, . 93-009
    The error handling method in traditional communication protocols is error detection and retransmission. This method is inappropriate for distributed multimedia systems for two reasons: It introduces variable delay unacceptable for isochronous streams, and it is very inefficient and difficult to use in the multicast environment typical for many multimedia applications. We propose AdFEC, an adaptable Forward Error Correction scheme based on binary polynomial algebra. It produces an adaptable amount of redundancy allowing different packet types to be protected according to their importance. The scheme was implemented in the framework of the XMovie project and proved to be very efficient.

Buch Kapitel

[2018] [2017] [2016] [2015] [2014] [2013] [2012] [2011] [2010] [2009] [2008] [2007] [2006] [2005] [2004] [2003] [2002] [2001] [2000] [1999] [1998] [1997] [1996] [1995] [1994] 1993 [1992] [1991] [1990] [1988] [1987] [1986] [1985] [1984] [1983] [1981] [1980] [1979]