> On 2017-09-01, at 20:55, HÁRSFALVI Levente <publicmailbox@harsfalvi.net> wrote: > > In the Poynton book (Digital Video and HDTV: Algorithms and Interfaces) > one can find the following sentences about the NTSC standard (and also > for a couple of other references, including PAL ). > > "...The Y’ and C components should be time-coincident > within ±25 ns. Error in chroma timing is known as > chroma-luma delay. " > > (2003 edition, page 514) > > So, to answer one of the original questions, the luma-chroma delay of > standard composite and separate Y/C video should be 0 ns within a +-25 > ns margin. Interestingly I recall some of the equipment having the adjustments for chroma/luma relation in something as seemingly strange as 37ns steps. No idea where it came from. Maybe the rationale was going like if it's something less than 25ns then don't bother but if it's bigger then shifting by 37 (instead of 25) will surely bring it into the "0 ±25 ns" range, even if not exactly on "0", whether it's 26 or 50 or 60, ... -- SD! - http://e4aws.silverdr.com/ Message was sent through the cbm-hackers mailing listReceived on 2017-09-01 22:01:50
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