Hdtv??

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workshoppete

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#1
Being as sky are bringing HDTV to our screens this Christmas via Sky sports....How about a HDTV topic.
Just a thought ....:)
 

rolfw

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#2
Been thinking about it, but a dedicated section may be a little quiet at the moment, very few people (apart from those in the industry and a few hobbyists) are talking about it. What I'll do is add it to the Tech Head forum, under the AV Discussion section. :)

I'd like to be proved wrong, but I believe that they have an uphill struggle on their hands to preach this gospel. ;)
 

rolfw

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#3
Thanks for the suggestion, have now adjusted the section heading to include HDTV and lets hope that it does catch on, certainly been impressed with what I've seen so far. :)
 

workshoppete

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#4
Well Good old Sky are going to throw Megabucks at it so it should arouse a bit of interest in the coming months. Having seen a few of the demo's at trade shows ,it is impressive on a big plasma screen. But as you say ...it remains to be seen if it will catch on .
Time will tell.
:)
 

rolfw

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#5
If you have any specs on receivers etc, please feel free to post them in the section, ultimately it would be nice to do a FAQ on it. :)
 

gameboy

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#6
Is it not the case that pictures are not yet digital due to the fact that most TV can't handle it?

Do all the digital boxes not convert the signal to analogue before sending to the TV.

Some of the latest PC, LCD and Plasmas had digital inputs.

That would be better than present but not as good a HDTV?

Seem to remember a modification for the standard S*Y box to output digital and it cost a couple of grand.

I stand to be corrected - as the man said in the orthopedic shoes!
 

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#7
gameboy said:
Seem to remember a modification for the standard S*Y box to output digital and it cost a couple of grand.
This isn't true HD but simply getting the best out of the standard signal that $ly/BBC etc broadcast.

There was a company offering the very expensive route but there is a much cheaper way if you have a first generation $lyPlus box.

See http://www.irj-tech.com/ for further details of how to DIY.

PaulR
 
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#8
In fact, all digital receivers DO have digital outputs, usually that's the SCART socket.

But, it's also true most tv displays can't show the standard European (575 lines) full picture resolution, and therefore I agree HDTV seems a bit redundant (maybe a way for broadcasters to make more money). Although, at present, much material is actually recorded in 1050line format.
 

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#9
Spiney

I have to disagree with you about the scart socket. This purely an analogue socket, for both video and audio. Even setting the option for RGB output still outputs in analaogue - althought superior to composite.

I thought the HD format was 1080 not 1050, or was that a slip of the keyboard? :-doh!

PaulR
 

Llew

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#10
Perhaps spiney means RGB is digital in the sense that the signals switch the CRT guns on and off during the scan to make up the colour picture ;)

Otherwise, as you say, all signals available from the scart are analogue, supplied by the MPEG decoder's D/A converter.

Llew
 

workshoppete

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#11
Maybe the reason for the big push is because when the likes of sky sport is blown up to a picture plasma/LCD size of 32 inches or more ,the picture becomes muddy and ragged,(and that's standing well back from the display!), emphasising the lack of fidelity compared to analogue. The HD format takes care of that (at a cost).
Maybe it will catch on in pubs,clubs and enthusiastic households but dont see Mr Average rushing in for a while yet.
 
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#12
nope, SCART is the digital output! At some point, the stream of 1s and 0s must be converted into a time varying voltage, to operate some type of display device, whatever that might be. Just as with digital audio, for operating an amplifier and loudspeaker. Otherwise, how on earth could you display the picture? What proceedure would turn the 1s and 0s into brightness and colour?

(Since this voltage is in incremental steps, and not infinitely variable, it is in fact a true digital output!).

Analogue output would normally refer to baseband composite PAL, or modulated UHF.

As for 1050/1080, what's 30 lines between friends?
 

Llew

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#13
spiney said:
nope, SCART is the digital output! At some point, the stream of 1s and 0s must be converted into a time varying voltage, to operate some type of display device, whatever that might be. Just as with digital audio, for operating an amplifier and loudspeaker. Otherwise, how on earth could you display the picture? What proceedure would turn the 1s and 0s into brightness and colour?

(Since this voltage is in incremental steps, and not infinitely variable, it is in fact a true digital output!).



The digital stream has already been converted before it appears at the scart - if you check the RGB outputs with a scope with the timebase running at line frequency you will see the amplitude of the R, G and B signals varying over the line period, e.g. the time it takes to scan the screen.

These will be fed to the RGB drive amplifiers to operate the CRT guns. Nothing to do with 1's and 0's at the scart output.

Llew
 
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#14
thanks, but I understand all the technology extremely well!

Point is, exactly what would count as a "digital output". You can certainly have a digital videostream, a la EBU standards, but you can't directly display it.

"It might be a plug to you, but it's a socket to me!"

(Rowan and Martin's laugh-in, NBC tv, circa 1968).
 

rolfw

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#15
Moved/copied this thread to the AV discussion forum, closing this one.
 
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