Re: House Reference Questions

hi as promised some background info.

the relation between the line's in 1080i@25Fps vs 625i@25Fps
is a ratio of 9:5. So every 9th line the rising edge of a trilevelsync will coincide with the falling edge of the SD bilevel sync.
This gives a vertical relation that line 1 of a HDfield 1 will coincide with the first line of a SD field every 625fields.

for 720P@50Fps this relationship with SD is a ratio of 12:5 i never calculated the vertical relation ship. but i'm sure there will be a relation ;-)
that's a thing for a rainy sunday afternoon instead of sudoko ;-).

if bob say's a cheapo kramer VDA will do the job i believe him. It is just that VDA's often play a double role in our installation giving me the need for high quality DA's. Even an old archive tape has to be treated with respect and these will often be CVBS and DA'ted with the same VDA. all though i never had problems please be aware of clamping CVBS DA's if they clamp on the frontporch they maybe can give problems with tri-level.

greet
Maurice



People saying they don't make mistake's often make nothing at all!