Hi guys I've been thinking about getting one of these Casio pocket Tvs, just to keep in the car for the kids to be entertained...

but im wondering what would happen once Analogue tv switches off in the next couple of years or so.. would they become useless?

i've looked around but cant find any digital pocket tvs.. anyone aware if there are any?

It is not posibble at the moment Im afriad. There is a service which may be available in the future that will use a network similar to that of 3g phones but it will bill you by the min, although this depends on someone buying the airspace which could cost billions.

Yes 3G or even 4G mobile will provide TV content on a paid basis, but I think in a few years we may see mini-tv's with tuners in, after all we are promised a more robust DTT signal when analogue is switched off aint we - .lol

If you had a proper in-car entertainment system you could always simply add a digital tuner to it, something like: http://www.caraudioplus.co.uk/pp/Aud...on_DVB-M1.html


It's possible, just a bit expensive and in the UK, iffy reception since our digital network wasn't designed for portable reception. Take a look at something like: http://www.sateuropa.co.uk/product_o...d=10&subcat=23

Portable digital broadcasting uses a different system - DVB-H as opposed to DVB-T. This is because it is very difficult to build a DVB-T receiver whch can operate off batteries or while in motion.

I believe there is a DVB-H trial going on, but as it will require a separate transmission network and handled TV is likely to be dominated by mobile phone technology, I wouldn't hold your breath!

I think the trial is in the Oxford area. The technology is more like 3G mobile phones, and not really related to normal tv (analogue or digital). Not sure yet, but I am guessing the signals will require some kind of subscription. If this is the only mobile tv service in the future, it will be the end of regular handheld tv's. But I still think someone will make a "digital handheld tv" using freeview technology. There will be demand for it - not everyone wants to subscribe! But as to if a freeview handheld tv would work or not, well, not very good is my guess.

Dave

Main problem is battery life - DVB-T is transmitted as a multiplex, as you know. The whole multiplex needs to be continuosly decoded to extract a single stream and battery life is unacceptable short as a result. DVB-H transmits each channel in compressed "pulses" of one channel at a time- in serial if you like - so you get a pulse and and can shut down the battery eating hardware until the next plulse arrives.

The other problems are that DVB-T transmitters are set up to give a good signal at roof height, and that at speeds over about 30mph the doppler shift causes the 8,000 sub carriers in a multiplex to start to clash.

(All from memory from a brefing session a while back, so I may have got my facts a bit twisted)

DVB H tranmissions do not need to be in a separate multiplex and the RF modulation can be the same as DTT. it can work time sliced to save battery power.
DVB-T is a very flexible standard and deos support (with lots of FEC and convolution coding ) reception in a fast car - but then you do not get many channels.