RGVHV to Component Video (YPrPb)

Typo on the 480p matrix. B should be 0.114. Adding composite sync is trivial. The coefficient depends on the amplitude of your sync. Typical levels have the video at 700 mv and sync at 300 mV (286mV for broadcast NTSC with 7.5IRE setup). BUT making composite sync from H and V is not trivial if you have to maintain interlace. For progressive sync it might be OK to invert the polarity of H sync during V. GG

Thanks I will double check the 480p matrix.

Do you have more detailed information on how to add H and V on to Y?

BTW, I have heard some vga to component transcoders are only good for

480p, do you guys know why is that? Is it only because the color martix? or the sync in 480p/720p/1080i are different? Can anyone explain to me in detail or when can I found the detailed information? any HDTV spec on the net?

Thanks

Not much to check on those matrix numbers. They add up to 1 so Blue has to be 0.114. As for transcoders, you're limited by the speed of the summing amplifiers. I know HDTV transcoders work in analog because it was part of a project I did 5 years back.

The sync for 480i is bi level (negative going only). I believe its the same for 480p. I know that for 720p and 1080i its trilevel +/- 300mV from black (nominally 0V) with the reference timing where tri-level crosses 0.

You should be able to find all sorts of good stuff at Teronix

Also check Gennum and Elantec.

has standards definitions. Many for free.

GG

Always make NEW mistakes.