Gary E. Miller <g...@rellim.com>: > Mark Atwood <fallenpega...@gmail.com> wrote: > > > Re IRIG being "primary time source in high end audio and video work" > > > > You are kidding me. SIgh. > > Sadly, not. > > > Can you expand on that for me please? > > My son does a lot of robotics, and some of the robots he works on > are now doing high end work holding high speed cameras filming TV > commercials and movies. NDA prevents me from saying the clients and > technically I should not even know. But you would know some of them > very well. > > Prolly by Xmas time you will be seeing some amazing new photography > styles. > > The audio, video and robotic equipment is all syncronized to IRIG > time. This becomes very important when you get up to 1,000 frame > a second stuff. > > I was also very surprised that IRIG was alive and well in this niche. > > I propsoed to them using NTP to sync the robots to the IRIG signal, but > for now they are slaving the robot on an IRIG time sync box, and running > everything else synce on IRIG.
And that's exactly what they *should* be doing.
This isn't an NTP use case, it's more like a PTP one - local sync with
higher precision requirements than you can get out of NTP. Whether they're
tracking UTC to within a specified number of microseconds isn't a
big deal, the big deal they have to be tracking *each other*.
I wouldn't use NTP for this if I could. They don't want to best-fit
to multiple clocks, they want to nail sync to a single master clock.
And, asnyway, I don't think you're describing a requirement for NTP to
*take in* IRIG as a primary clock source, either. Why do that? If the
IRIG sync box has any kind of digital output, even something as simple
as a one-wire 1PPS export, you run any NTP you want to be downstream of
the master sync clock from that rather than the IRIG.
I don't see any problem here that is best solved by the IRIG driver I just
threw out.
--
<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>
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