| Summary: | The tradeoff between picture quality and bandwidth usage is one of the most prominent
issues in the world of broadcasting. Since broadcasters are able to simultaneously
transmit multiple streams in a channel, they face the challenge of guaranteeing a certain
picture quality required by each of the video streams transmitted while maximizing the
number of video streams carried in each channel. To address this problem, we developed
an MPEG-2 based multi-program video coding system, suitable for digital T V
broadcasting, video on demand, and high definition TV over broadcast satellite networks
with limited bandwidth. The system can be easily implemented for commercial use in
digital broadcasting applications. Compared to present broadcast systems and for the
same level of guaranteed picture quality, our system greatly increases the number of
video streams transmitted in each channel. As a result, a large number of transponders
can be freed to carry real-time broadcasting. By switching from tape storage to video
server technology, the need for numerous playback (VTR) systems at the headend is
eliminated. In addition, the majority of the complete MPEG-2 encoders are replaced by
much less complex MPEG-2 transcoders. The freeing of numerous transponders, the
elimination of numerous playback systems, and the replacement of the complete MPEG-2
encoders with MPEG-2 transcoders provide a much more cost-effective solution for the
broadcast stations. === Applied Science, Faculty of === Electrical and Computer Engineering, Department of === Graduate
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