Re: On Screen Display Project Board

["Darko" <babaroga999@xxxxxxx>]

Keith, do you remember Genlock from the days of Amiga ?

We could then mix computer video + composite TV signal.  That kind
of stuff would be ideal for on screen displays if it still exists
and been upgraded to something like SVideo or RGB....

I just found this link (upgraded version), although, it's a "bit"
pricey

http://www.micronica.com.au/catalog/genlock/

regards


--- In ukha_d@xxxxxxx, "Keith Doxey" <ukha@d...> wrote:
> The STV5730A chip itself could work on just one of the colour
signals to
> give you a grren overlay but it also has RGB capability although
the
> circuitry would be more complex. I havent tried that yet but there
is a
> description.
>
> The HomeVison would need to be modified to work with RGB as it
wouldnt have
> any sync on the colour signals. It may be possible to use HV on S-
Video
> (Y/C) or Component (Y-Cr-Cb)(YUV) by feeding the Y signal via
Homevision.
> This would give overlay in Monochrome only as you are adding it to
the
> Luminance signal which also carries the sync.
>
> You would need to add some extra length to the Chroma or Cr-Cb/UV
leads to
> ensure that all signal paths were the same length otherwise the
colours
> would shift left or right of the image detail. You also would only
be able
> to do this in Video Overlay mode not Solid Background  mode
because the
> background would come out a shade of grey with white text and the
colour
> information from the original signal would still be reaching the
display.
> the sync would also be internal so the coloured splogde may also
be sliding
> all over ths display. Psychadelic OSD :-)
>
> You are hereby nominated as official tester of my theory :-)
>
> Keith
>
> www.diyha.co.uk
> www.kat5.tv
>
>
> > -----Original Message-----
> > From: Paul [mailto:groups@xxxxxxx...]
> > Sent: 27 July 2003 10:30
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] On Screen Display Project Board
> >
> >
> > Can any of these overlay devices (including HV overlay) be
> > used on a RGB / YUV system?
> >
> >
> >
> > My main viewing device is my plasma which is fed from Node0
> > by RGB and then converted in the AV Room to YUV, fed through
> > my amp and then into the plasma. Can you just feed one of the
> > RGB lines through the HV OSD or would this introduce
> > timing/sync problems?
> >
> > Paul.
> >
> >
> >
> > -----Original Message-----
> > From: Frank Mc Alinden [mailto:fmcalind@xxxxxxx...]
> > Sent: 27 July 2003 09:43
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] On Screen Display Project Board
> >
> >
> >
> > Hi Tracey
> >
> >   Apparently that chip is no longer being made..did some pic
> > stuff with it myself ....
> >
> > Frank
> >   ----- Original Message -----
> >   From: Tracey Gardner
> >   To: ukha_d@xxxxxxx
> >   Sent: Sunday, July 27, 2003 6:19 PM
> >   Subject: [ukha_d] On Screen Display Project Board
> >
> >
> >   I don't know if this would be of interest to anyone on the
list?
> >
> >   Tracey
> >
> >   http://www.stv5730a.co.uk/
> >
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