Briefly, DVB-T2 uses MPEG4 delivered in a 30Mbps (compare 18Mbps and 24Mps) multiplex using 256QAM (compared with 16QAM and 64QAM) with LDPC/BCH error correction (not FEC) and 32k carriers (compare 2k and 8k). http://www.ukfree.tv/fullstory.php?storyid=1107051377
Basically, this is not a software upgrade! 2009/9/17 Brendan Quinn <[email protected]> > Alan wrote: > > I assume my topfield HD will be out of date with these proposed > > changes? > > Ant replied: > > You'll need to retune, but the services you currently get on Freeview > > should still be available. Think of Freeview + as an optional > > upgrade. > > To which Alun wrote: > > I meant in terms of the HD element if they are changing the spec? If > there is a > > decryption requirement I doubt the Topfield will have it? > > I would say you're right, your box wont' receive HD freeview signals. > But that's not (only) because of any encryption, it's because the spec > for encoding HD over freeview [1] was only agreed last week and the > first box was announced five days ago, to be released "in the first half > of 2010": > > http://www.broadbandtvnews.com/2009/09/12/pace-unveils-dvb-t2-freeview-h > d-box/ > > I guess you have this box [2]: > > http://www.topfield.co.uk/index.php?option=com_content&view=article&id=1 > 0&catid=2&Itemid=3 > > It uses "HDMI upscaling" to work with your HD TV. But it's not actually > processing the real freeview HD signal and never can -- your box needs > different chips to be able to do that. So to actually see Freeview HD in > HD, you will need to buy a new box :-( > > HTH, > > Brendan. > [1] known as DVB-T2. The DVB are the standards committee for most TV > standards in Europe, India, Australia etc. The BBC is a member. DVB-T > was the standard for regular freeview, so DVB-T2 is the standard for > next-gen freeview: the "T" is for terrestrial. You can guess that DVB-C > is for cable and DVB-S is for satellite... They also have C2 and S2 > standards for HD over those platforms. > [2] URL edited for brevity -- yes it was much longer than that before -- > but it seems to work... > > - > Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please > visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. > Unofficial list archive: > http://www.mail-archive.com/[email protected]/ > -- Brian Butterworth follow me on twitter: http://twitter.com/briantist web: http://www.ukfree.tv - independent digital television and switchover advice, since 2002
