Re: Averlogic AL250 and scan doubling

Paul Carpenter wrote:

For a fixed input to LCD you will have to use NTSC YUV mode and note
that the effective 24 bit colour input is cropped to 16bit colour by the
chip.
Anything non-square pixel or using 601 formats requires a CRT that hopefully
can sync to that rate. Anything using an LCD would need register setups to
CROP the image.

In my case I'm coming analog RGB NTSC to standard analog VGA HD15. I think that the AL250 requires digital inputs, so I think I'd need to front the AL250 with an AL875.

> Logic Devices make various chips for digital
processing which can be
setup quite easily to do various interpolation schemes, even changing
horizontal
resolution for full image display.

Thanks for the pointer, I'll check there.

A good resource for this type of thing is the book

Video Demystified (I have first and fourth editions)
By Keith Jack (ex Brooktree engineer)

ISBN 0-7506-7622-4

Excellent. Thanks for the reference. I've actually looked at that book before.

Thanks

Keith
.