Date   : Tue, 09 Jun 2009 14:02:15 +0100
From   : adsb@... (Andrew Benham)
Subject: Morley Teletext Adapter

Joel Rowbottom wrote:
> Hi Anders --
> 
> On Tue, 9 Jun 2009 14:35:29 +0200, "Anders Carlsson"
> <anders.carlsson@...> wrote:
> 
>> While I don't have a clue how digital broadcasts work in the UK, I am
>> fairly 
>> positive the DVB aerial broadcasts here in Sweden still carry a teletext 
>> signal.
> 
> I know some satellite (DVB-S) services still carry analogue teletext
> transmissions, so I have no reason to believe DVB-T would be any different.

DVB-T, at least in the UK, doesn't have the same sort of teletext.  Analogue
TV has teletext signals on certain lines in the vertical blanking interval.

DVB-T has MHEG-5 data contained in carousels which are on declared pids in
the data stream.  (Sorry for the abbreviation soup).
The upside is that programmes aren't restricted to a specific set of characters
and graphics.  The downside is that one needs to do at lot more to decode
and display it.

http://www.impala.org/what-mheg/how-mheg-5-works-and-applications

-- 
Andrew Benham           adsb@...       
Southgate, London N14, United Kingdom

The gates in my computer are AND OR and NOT, not "Bill".