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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: TV tuners Reply #15 - 23. Sep 2008 at 18:24 I guess many of the advances to make mobile DVB happen will be in the receivers, making them more powerful and more selective at the electronic level, given that other factors are reasonably static (if the fat thingy in No 10 sells off the bandwidth when analogue goes, will there be much scope for boosting transmitter power?)
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Kevin Wood

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Re: TV tuners
Reply #16 - 23. Sep 2008 at 19:34

TheBoy wrote on 23. Sep 2008 at 18:24:

I guess many of the advances to make mobile DVB happen will be in the receivers, making them more powerful and more selective at the electronic level, given that other factors are reasonably static (if the fat thingy in No 10 sells off the bandwidth when analogue goes, will there be much scope for boosting transmitter power?)

The problem is, DVB-T was designed for a large number of channels at a relatively high bit rate (so the picture doesn't look offensive on a ruddy great TV) but with the data not coded very robustly due to the relatively static nature of most receiving stations and the ability to put up high gain antennae.

The demands of a mobile setup are for a low bit rate (screen is going to be small - so no point in high quality), more robustly coded signal so better error correction and equalisation can be applied by the receiver and it can cope with the multipath you can get on the move.

Whereas with FM radio later innovations like RDS allowed it to be useable in a mobile environment the requirements are so conflicting with DVB-T it seems less likely. However, when FM Stereo was first launched you'd probably have been branded a madman for suggesting listening to stereo radio broadcasts in a car. Where would you put all the valves, for a start? Grin

So who knows?

There are also technologies like HSDPA and LTE which, if they got cheap enough, might allow mobile streaming of video over IP to mobile users.

Kevin

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Dave DND

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Re: TV tuners
Reply #17 - 23. Sep 2008 at 19:54

Kevin Wood wrote on 23. Sep 2008 at 19:34:

TheBoy wrote on 23. Sep 2008 at 18:24:

I guess many of the advances to make mobile DVB happen will be in the receivers, making them more powerful and more selective at the electronic level, given that other factors are reasonably static (if the fat thingy in No 10 sells off the bandwidth when analogue goes, will there be much scope for boosting transmitter power?)

The problem is, DVB-T was designed for a large number of channels at a relatively high bit rate (so the picture doesn't look offensive on a ruddy great TV) but with the data not coded very robustly due to the relatively static nature of most receiving stations and the ability to put up high gain antennae.

The demands of a mobile setup are for a low bit rate (screen is going to be small - so no point in high quality), more robustly coded signal so better error correction and equalisation can be applied by the receiver and it can cope with the multipath you can get on the move.

Whereas with FM radio later innovations like RDS allowed it to be useable in a mobile environment the requirements are so conflicting with DVB-T it seems less likely. However, when FM Stereo was first launched you'd probably have been branded a madman for suggesting listening to stereo radio broadcasts in a car. Where would you put all the valves, for a start? Grin

So who knows?

There are also technologies like HSDPA and LTE which, if they got cheap enough, might allow mobile streaming of video over IP to mobile users.

Kevin

I remember how long it took for RDS to catch on, and how expensive it was in its day. There is no doubt that it will happen, and will probably happen faster nowadays with many technological breakthroughs that are now possible and there is a definate demand for it -

what worries me though is not the technology, but its the Format wars that will undoubtedly break out over different manufacturers which could prove costly for those wanting to purchase equipment now - we all remember the VHS and Betamax wars, well it happened again recently didn`t it between HDDVD and Blueray ? -

Cry

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www.instant-radio-codes.com

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Marks DTM Calib

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Re: TV tuners
Reply #18 - 24. Sep 2008 at 08:54

Mobile streaming is the only existing practical method for digital broadcasts to the car.

Trouble is that the current digital setup is based around as lower power transmitted signal as possible and there is not much scope for improving the receivers much beyond what they achieve today.

I cant see them ever winding the power up following the analogue switch off.

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chrisgixer

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Re: TV tuners
Reply #19 - 25. Sep 2008 at 00:35

am i right in thinking the mobile(phone) tv band width wont be available until 2010? when the band width re shuffle is finished. Dont see any point worrying about it until thats available, presuming the car makers will make use of it?

Nokia(yes, gay, i know) have a hand set or 2 with it featured for other markets, i might be able to afford ,and have the kids to justify, the cid conversion by then.

I dont suppose a better/cheaper way has come to light to convert the cid to work with a nokia tv out?
Oof on the cid, maybe one day.

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