teletext

On Wed, 19 Nov 2003 00:37:52 +0000 (UTC), "R. Mark Clayton"
wrote:


"JPG" wrote in message
.. .
On 17 Nov 2003 19:42:15 GMT, (Bill) wrote:

How come I can get the date and time from teletext when I play back a
videotape? Obviously it's a bit garbled but it's good enough to remind me
what
channel I've recorded and when. I would have thought VHS would have
stopped
teletext dead.


I have an S-VHS recorder that seems to record an almost faultless teletext
page.
Even subtitles will work most of the time.

Well what make / model was that then - I think I might buy one!

I'm at work ATM but I'll let you know this evening. I think it was a Panasonic
- cost £129 from Dixons XL at the Bullring in Birmingham.

JPG



JPG


Puzzled

Rotherham

I'm at work ATM

It looks like it!

Bill
On the subject of television interference, there can be no doubt that the most
effective solution is the one that prevents the interference from ever
occurring.
Practical Television, August 1950.

I'm at work ATM

It looks like it!

Bill
On the subject of television interference, there can be no doubt that the most
effective solution is the one that prevents the interference from ever
occurring.
Practical Television, August 1950.

Alan wrote:

: A good VCR (especially SVHS) will have enough bandwidth to record the
: text data, albeit with some errors. ISTR that the header line of each
: text page (which includes the date and time) has error correction

You recall incorrectly. The 'magazine and row address group' (MRAG)
has additional error protection, but the date and time (if present
in the header) are sent as ordinary text characters (7 bits plus parity).

Richard.
http://www.rtrussell.co.uk/
To reply by email change 'news' to 'richard'

Alan wrote:

: A good VCR (especially SVHS) will have enough bandwidth to record the
: text data, albeit with some errors. ISTR that the header line of each
: text page (which includes the date and time) has error correction

You recall incorrectly. The 'magazine and row address group' (MRAG)
has additional error protection, but the date and time (if present
in the header) are sent as ordinary text characters (7 bits plus parity).

Richard.
http://www.rtrussell.co.uk/
To reply by email change 'news' to 'richard'

JPG wrote:

: I'm at work ATM but I'll let you know this evening. I think it was a
: Panasonic - cost GBP129 from Dixons XL at the Bullring in Birmingham.

Be careful. Some Panasonic S-VHS machines (I have one) use the VBI
to store their own data (tape library, subtitles etc.) so although
they could in principle record near-perfect teletext, in practice
several of the data lines are wiped out. The result: error-free
text on some rows and none on others!

Richard.
http://www.rtrussell.co.uk/
To reply by email change 'news' to 'richard'

JPG wrote:

: I'm at work ATM but I'll let you know this evening. I think it was a
: Panasonic - cost GBP129 from Dixons XL at the Bullring in Birmingham.

Be careful. Some Panasonic S-VHS machines (I have one) use the VBI
to store their own data (tape library, subtitles etc.) so although
they could in principle record near-perfect teletext, in practice
several of the data lines are wiped out. The result: error-free
text on some rows and none on others!

Richard.
http://www.rtrussell.co.uk/
To reply by email change 'news' to 'richard'

"JPG" wrote in message
...
On 17 Nov 2003 19:42:15 GMT, (Bill) wrote:

How come I can get the date and time from teletext when I play back a
videotape? Obviously it's a bit garbled but it's good enough to remind me
what
channel I've recorded and when. I would have thought VHS would have
stopped
teletext dead.


I have an S-VHS recorder that seems to record an almost faultless teletext
page.
Even subtitles will work most of the time.

JPG


Puzzled

Rotherham


I have this picture in my head of your tape library - Teletext 19/03/2003,
Test Cards 1950 thro 1960, Trains I have spotted......... :-)

"JPG" wrote in message
...
On 17 Nov 2003 19:42:15 GMT, (Bill) wrote:

How come I can get the date and time from teletext when I play back a
videotape? Obviously it's a bit garbled but it's good enough to remind me
what
channel I've recorded and when. I would have thought VHS would have
stopped
teletext dead.


I have an S-VHS recorder that seems to record an almost faultless teletext
page.
Even subtitles will work most of the time.

JPG


Puzzled

Rotherham


I have this picture in my head of your tape library - Teletext 19/03/2003,
Test Cards 1950 thro 1960, Trains I have spotted......... :-)

I have this picture in my head of your tape library - Teletext 19/03/2003,


How did you know I was born on the 19th March?

Bill
On the subject of television interference, there can be no doubt that the most
effective solution is the one that prevents the interference from ever
occurring.
Practical Television, August 1950.