Thread: NTL should switch to a digital only service!
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Old 07-12-2004, 11:50   #23
spiderplant
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Re: NTL should switch to a digital only service!
Quote:
Originally Posted by Pob!
Well this is confusing, and a google search uncovers lots of info
I can explain... On UK satellite, QPSK modulation is used. (Simplifying a little)each transmitted symbol carries two bits of data, so the bit rate is double the bandwidth.

See http://www.educatorscorner.com/media/AN_5965-7160E.pdf if you want to know a load more about this.

I think the BSKYB HDTV trial will use up to 15Mbps, but I'm not certain.

Quote:
Originally Posted by Pob!
Whichever way you look at it though, HDTV will use up a lot more room than existing digital broadcasts.
Pob!
Only if you use the same compression technology (e.g. MPEG-2). New technologies are on their way which will get higher quality from the same bitrate (eg. MPEG-4 and WMV9).
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