Device for video conversion from RGB progressive to interlaced

[Jimmerthy]

I was wondering if anyone knows of any I.C. on the market at the
moment which functions as an interlacer, taking say 50Hz progressive
RGB in and outputting 50 fields/25 Frames interlaced RGB out.

I'd guess that it would operate by copying out the even scan lines
from frame A and then the odd lines from frame B then back to the even
lines again on C.

My motivation to build such a device is so that I can drive my TV's
RGB SCART input (european) from my PC's VGA port.

With PowerStrip, my graphics card (Radeon 8500) is capable of scanning
down to 50Hz interlaced and produces a very well defined picture on my
TV when directly hooked up through SCART, but there is a driver issue
which prevents DVD playback working properly in interlaced modes.

So I'm looking for this device as a workaround so that I run my
display adapter in progressive but at a coherent scan rate which could
be alternate frame interlaced to give me a working system.

Please reply if you have any opinions on whether this idea for
progressive to interlaced conversion - i.e. would be sensible or not.

If you're interested in the direct VGA to RGB scart connection then
read my posting on www.avsforum.com
http://www.avsforum.com/avs-vb/showthread.php?s=&threadid=126946&highlight=success

James

[gagir]

Look at Analog Devices

gagir

"Jimmerthy" <jwe...@hotmail.com> wrote in message
news:83k1aukqlmhjpje7c...@4ax.com...

[Iwo Mergler]

Jimmerthy wrote:
>
> I was wondering if anyone knows of any I.C. on the market at the
> moment which functions as an interlacer, taking say 50Hz progressive
> RGB in and outputting 50 fields/25 Frames interlaced RGB out.
>
> I'd guess that it would operate by copying out the even scan lines
> from frame A and then the odd lines from frame B then back to the even
> lines again on C.
>

50Hz non interlaced runs at double line rate, which means
you need something like an A/D - FIFO - D/A structure to
convert between the modes. Feed every second line into
the A/D and run the D/A at half the sampling rate. Apart
from that, you need to generate sync pulses for the interlaced
signal. It could be done with a CPLD.

I don't know of a dedicated chip for this, but either way,
it could be easier to get the manufacturer of your driver
or DVD player to fix the interlace problem. You try to
fix a software fault with hardware, which is not the
traditional way of doing things... :^)

Regards,

Iwo

[Speedy]

"Jimmerthy" <jwe...@hotmail.com> wrote in message
news:83k1aukqlmhjpje7c...@4ax.com...

Look at Averlogic www.averlogic.com , they have the AL128. You can also
purchase an already made evaluation board, although I don't know how much.
It has SCART too.

Ryan