OT: Component Video (ooppsss !!)

[Guests]

[ukvac] OT: Component Video (ooppsss !!)
LOL.... Well it is Friday !!!

Bloody web refence table, Bugger Me !!!

Cheers,
Colin ( feels the flames gently warming his humble pie )

 

[Guests]

Re: [ukvac] OT: Component Video (ooppsss !!)
At 14:46 14/11/03 -0000, Colin Davies wrote:

>> > Component Video. The separate Red, Green and Blue signals that are
>> > normally combined in the composite video signal.

>> Component video is Y luminence and sync and R-Y and B-Y which is

>LOL.... Well it is Friday !!!
>
>Bloody web refence table, Bugger Me !!!

Don't worry, you're both right.

Component video is defined as a signal where the colour signals each have a
seperate signal path.

So can include systems with three or more full bandwidth video channels
such as RGB, and Y R-Y B-Y, both are equal to each other in quality and can
be converted from one form to the other by simple addition and subtraction.

Component video also inludes systems where the colour difference signals
are bandwidth limited, ie YUV, YCrCb, YPrPb, which are technically lower
quality, (but usually unnoticeable). These can be converted back to RGB in
the same way as the full bandwidth systems, but a little quality is lost.

However, with the introduction of Component Video inputs/outputs on
consumer equipment in the states, it is generally taken to mean an Y R-Y
B-Y system (or more accurately a YPrPb system).

Cheers,
Dave (who knew that one day the four years spent designing broadcast video
stuff would come to some practical use).



DATA Imported from archives: originally posted by Dave Roberts (daverob@cwcom.net)

 

[LukeWells]

Re: [ukvac] OT: Component Video (ooppsss !!)
Dave, you seem to be ukvacs resident video expert, so speaking on behalf of
ukvac, we challenge you to design the simplest low cost component to rgb
converter that will work with gorf boards

Regards

Luke

 

[DesG]

RE: [ukvac] OT: Component Video (ooppsss !!)
Dave,

Component inputs on domestic equipment is Y-Cr-Cb unless I am very much
mistaken.

Mind you, anything S-video or above keeps me happy except for vv large
screens.

But you hear so much tosh talked by americans that componet input is the
best quality input for your TV I always correct people

As always your source is critical, it doesn't matter if you use RGB or
component if the source is composite, the picture is still gonna be crap

Cheers, Des.

>

DATA Imported from archives: originally posted by Des Gibbons (des@fastcarz.com)

 

[Guests]

Re: [ukvac] OT: Component Video (ooppsss !!)
Luke Wells wrote:

>Dave, you seem to be ukvacs resident video expert, so speaking on behalf of
>ukvac, we challenge you to design the simplest low cost component to rgb
>converter that will work with gorf boards

You could make the challenge, but there are three problems to overcome,

1 - I have no gorf boards

2 - I have not got enough spare time at the moment

3 - I'm one of those engineers who can talk about something a lot, but
never seems to get around to actually doing it. Proof of this can be seen
by looking at my 'untested' pile of boards, and the number of machines in
my collection that are still 'undergoing restoration' ;-)

I've designed a similar circuit for this in the past (betacam YUV to scart
RGB+sync). A consumer grade version of this circuit could be made with just
a quad op-amp and a bunch of resistors.

But the fact that there is a delay line on the Gorf board may make it a bit
more complicated than that, and a simple solution like this might leave a
shadowing effect or other distortions around the graphics on the screen.

I still have one of the YUV-RGB boards around somewhere, it would be
interesting to try it out on a Gorf board, and see if the design is useable.

Des Gibbons wrote:

>Component inputs on domestic equipment is Y-Cr-Cb unless I am very much
>mistaken.

You could be right, Y-Cr-Cb and Y-Pr-Pb are essentially the same system,
and both terms seem to be interchangeable nowadays.

The original definition that was taught to me was that American NTSC kit is
Y-Pr-Pb, the rest of the world (PAL) uses Y-Cr-Cb. Though as most equipment
is multi-standard nowadays the distinction between the two systems seems to
have been lost, and it is just a matter of manufacturers preference as to
what their inputs are called.

Some sites are now stating that Y-Pr-Pb is for progressive scan video and
Y=Cr-Cb for interlaced, and this may be a new definition that I was unaware
of. (I've been working in GSM for the last 5 years so my video knowledge
may be a little out of date!).

Cheers,
Dave.



DATA Imported from archives: originally posted by Dave Roberts (daverob@cwcom.net)