Anyone know anything about teletext systems?
Have a friend who runs a small hotel/boarding house in the west country. He has a TV in each room the can display teletext pages and they run off a common aerial feed (analogue not digital).
We were kicking around the idea of him setting up his own set of teletext pages and feeding in to this set up.
I've done a quick Google but it's either people trying to sell teletext services or hardware. Can't seem to find much basic info.
Anyone know of some good reference sites?
Anyone know what sort of software/hardware would be required (Linux based if possible)?
Keith
You're going to have fun with this one.....
In order to get teletext pages into a TV signal, you'll need to insert data into the VBI(Vertical Blanking Interval - lines 7 - 21) of a TV signal. This requires a special databridge to perform this task. If you ask a local TV station, they may have some analogue databridges they are throwing away (MRG CT800/ATP600). You can talk to the databridge via RS232/RS422. Have a look at http://www.mrgsystems.co.uk/
If your interested, teletext subtitles are on line 20 of a TV signal.
In all honesty you'll find it far easier to have a PC generate webpages/slideshow type thingy and use the TV out of the graphics card. You could use an old VHS to act as an RF modulator for the aerial system.
Hope that helps.
Chris
On Friday 10 October 2003 16:47, Chris Glover wrote:
You could use an old VHS to act as an RF modulator for the aerial system.
Or better still obtain a um1233 Pal modulator (dead spectrums are a good place to find these) it's a total doddle to wire up to a composite video output and easily driven from your PC power supply.
No point having a bulky old VCR cloggin up the place doing the job of something the size of a matchbox :o)
In fact after a quick glance through my project parts drawer, I see one here you can have for the postage costs.
Or better still obtain a um1233 Pal modulator (dead spectrums are a good place to find these) it's a total doddle to wire up to a composite video output and easily driven from your PC power supply.
No point having a bulky old VCR cloggin up the place doing the job of something the size of a matchbox :o)
Good thinking! I was going for the VHS option for the simplicity angle. I don't know if the UM1233 supports audio.
Chris *************************************************************************** E Mail Chris@glovercc.clara.co.uk WWW http://www.glovercc.clara.co.uk Someday, we'll look back on this, laugh nervously and change the subject. -Anon
On Saturday 11 October 2003 00:09, Chris Glover wrote:
Good thinking! I was going for the VHS option for the simplicity angle. I don't know if the UM1233 supports audio.
Nope, but there is a version that does (can't remember the number offhand), I was thinking last night actually given a decent internet connection you could stream Virgin Radio (or something else) and transmit it alongside the slideshow pages.
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Chris Glover -
kpwatson＠pop3.ukfsn.org -
Wayne Stallwood