|
|
Posted by Martin Underwood on 10/28/06 23:15
Zero Tolerance wrote in
4543a63e.121217218@enews.newsguy.com:
> On Sat, 28 Oct 2006 17:11:19 +0100, "Martin Underwood" <a@b> wrote:
>
>> Also, some well-established capabilities of analogue VHS recorders,
>> such as the recording of teletext subtitles as closed captions (as
>> opposed to being burnt-into the picture) and the identification of
>> programmes by title in a tape library (picked up from teletext), are
>> not available with current set-top boxes.
>
> There's no reason why conventional teletext can't be carried digitally
> and certainly some of the earlier ONdigital set top boxes could quite
> happily regenerate the VBI when teletext data was broadcast. The issue
> is that it was apparently a policy decision by the likes of the BBC
> and Teletext Ltd not to broadcast conventional teletext on the DTT
> platform.
I was talking about generating a restricted set of teletext pages *locally*
at the decoder, rather than broadcasting all telextext pages. Specifically:
1. Generate a page 888 with the subtitles for the programme, using the
subtitles which are already transmitted and which can be overlaid onto the
programme. Suitable VCRs (such as my Panasonic one) can then record those
subtitles as closed captions and, during playback, the viewer can choose to
diaply them or not.
2. Generate whichever page it is which gives the title of the current
programme, using the "now/next" information, so that suitable VCRs with a
tape library feature can record that programme title in its list of tape
contents rather than just "BBC1 28 Oct 2006 21:00".
Also, they could transmit PDC information in such a way that the set top box
can generate whatever signal a PDC-enabled VCR uses to determine exactly
when to turn on and off with a late-running programme.
Here wer have three examples of technological advances that were developed
to improve the functionality of analogue VCRs, where no effort was made to
continue that proven functionality with digital broadcasts.
Navigation:
[Reply to this message]
|