Bernd Girod is ProFessor of Electrical Engineering and Computer Science at the University of Stanford, California. Within the Information Systems Laboratory, his group carries out research on video compression, networked multimedia and 3-D image analysis and synthesis. Rudolf Rabenstein is a Faculty member of the Telecommunications Laboratory at the University of Erlangen-Nuernberg in Germany. His teaching and research activities include web-based tele-teaching as well as one- and multidimensional system theory and applications. Alexander Stenger is with the Technology Centre For Mobile Communications of Philips Semiconductors in Nuernberg, Germany, where he is responsible for acoustic interfaces of mobile telecommunications products.