Originally posted by: KenAF
With the transition to digital in the U.S., broadcasters have the option of doing HDTV, multicasting, PPV, and/or commercial data services. The DTV mandate in the U.S. requires that broadcasters at least duplicate their existing service in digital, and they can do what they want with the remaining bandwidth. Duplication of the analog SD service in digital consumes 3Mbps to 5Mbps (depending on compression). That leaves them an addition 14-16Mbps to offer more channels, data services, Pay-TV service, or whatever else they want.
So it would be possible for CBS/Viacom to offer five channels, Disney/ABC to offer five channels, etc etc all for free (or for subscription) over the airwaves. But instead, the likes of CBS and ABC have decided to offer HDTV instead, at least during primetime hours. Rather than delivering five low-quality standard channels, they've decided to dedicate all the bandwidth to high-quality HDTV, or to do HDTV plus a low-bandwidth 480i/480p channel for local / education purposes. With the Freeview system, the UK has essentially decided to go with low quality, low-resolution programming rather than the much-better-than-DVD quality HDTV we have here in the United States.
If anyone in the UK or elsewhere would like to see what real HDTV looks like, and is willing to host a few HDTV clips, let me know, and I'll send a few for hosting. HDTV clips are playable on a PC with certain DVD players, like WinDVD, as well as some freeware players, like VLC.