Mass Media & Technology

Subtitle colours

Technologist London London
The UK used transmission using magazine parallel which meant that one or more magazine
was allocated to one or more tv lines. This does mean that you can more closely set the cycle time.
The Germans and Italians use magazine serial which at its simplest is to transmit all,the pages you have
on all the lines you have ... so it does seem to go like the clappers ...
Mag serial was the way Teletext started ......
it is less efficient than mag parallel and it is very complex to add subtitles .. you have to stop the text pages put out a subtitle and then start again.
This may mean retransmitting a page if the subtitle came part way through the page.

In mag parallel you can put subtitles on its own tv line like BBC used 20/333 and itv just 335
Or actually muxed in with the text service as early days of BBC playout of UKTV .

There are two ways you navigate used “fastext” aka FLOF which puts the page links data
in the page which has the links,on the bottom of the patent using packet 27
The Germans use TOP table of pages which uses links in separate pages starting with page 1F0
The basic TOP page. It is organised to,quote the spec
The basic idea underlying the TOP system is to categorize the pages within a Teletext transmission
according to specific themes and sub-themes.
Very organised these Germans !
Whiie either system can be used with either mag serial and mag parellel ..
TOP decoders only worked with mag serial .... but Italy use FLOF with mag serial
The details are in EN 300 706 .
There was a Good description on SMPTE Website but they have redesigned it ..
And lost historic pages it seems...
Andrew Wood Founding member Central (West) Midlands Today
As has been mentioned, you can still get subtitles on 888 and 889 on satellite on the UK channels depending on your setup.

On my PC, with DVBDream and its teletext plugin, I find it useful for watching S4C with English subtitles.

You can still find the odd non-subtitle page being broadcast but not very often at all.
Last edited by Andrew Wood on 16 January 2021 10:23pm

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