IPTV Part 3 - The Methods and a Working Technology

[Rodolfo]

When using standard MPEG-2 compression, an HD channel requires about 19 Mbps of bandwidth to be transmitted. If using DSL or cable modem, although it is considered hi-speed for typical Internet services, it currently has the capacity to transmit only a small fraction of what raw HDTV requires.

Even when re-compressing the 19 Mbps with more efficient compression algorithms like MPEG-4 or VC1, and even when using additional transmission-saving techniques to fit HDTV content into those typical hi-speed Internet services, the approach would be a challenge, not to mention that after making use of this bandwidth for HDTV there will be little or no headroom left for Internet downloads of music, files, photos, etc.

Additionally, it becomes less feasible to...

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