I think you're talking about the VITC, which is on lines 19 and 20 (so you get it on both fields with interlacing). VITC carries hour/minute/second/frame (same as LTC), but I don't know if it's "program time" (since start of program) or "real time).
There's a bunch of flavors of vertical interval time code, too.. Some put different info on each line, and use up to 4 lines. And don't forget the complexities introduced by 3/2 pulldown. As for what's actually broadcast (as opposed to put on a VTR or distributed in the editing suite) that's a whole 'nother ballgame. On 5/25/09 2:07 PM, "Glenn Little WB4UIV" <glennmaill...@bellsouth.net> wrote: > It appears that the time information is transmitted in line 21 of the > analog TV signal. > This is the same line that carries Close Captions in an analog signal. > It further appears that PBS is the major carrier of these time signals. > See : > http://simson.net/ref/autoclock/Interface-June-01.pdf#search=%27PBS%20time%20s > ignal%20auto%20VCR%20set%27 > > This may explain why you are having problems. > > I do not know how this is handled in the DTV world. > > We translate line 21 captions to CEA-608 and CEA-708 captions for out > DTV transmissions. > > See: > http://ncamftp.wgbh.org/DTV/CEA%20test%20material/Iteration_1/It1.2ReadMe.pdf > > This explains a little about the conversion of analog line 21 to DTV captions. > > It is possible that you can set your recorder to read 608 captions? > > Hope this helps. > > 73 > Glenn > WB4UIV > CE WCIV TV > > At 12:52 PM 5/25/2009, Bill Hawkins wrote: >> Aficionados of accurate time, >> >> I have two Panasonic DVD TV recorders, a DMR-EZ27 and 28. They were set to >> automatically sync time to a TV station. This worked fine until a few months >> ago. Now they are on manual time, but, of course, they drift. >> >> Tried to turn automatic time setting back on this morning. The screen says, >> "This may take a few minutes." It still said that 10 minutes later, as the >> busy indicator continued to rotate through three spots. >> >> Gave up on automatic and asked the only group I know that might know. >> >> Why did TV stations stop broadcasting time signals? HDTV requirements? >> >> Could a cable company interfere with the time signals? >> >> Thanks, >> Bill Hawkins >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.