[Avid-L2] Re: HDCam SR 24p q

There is most definitely timing in the SDI world. There are windows of tolerance that can be exceeded which will cause problems. The tek scopes and others have timing functions. I have seen issues with Kona3 card outputs where a Sony 5500 would not except a 720P signal seeing it as unrecognizable or something like that. Adjusting the vertical timing of the Kona control panel a vertical line's worth got the deck to accept the signal. At the same time a 5800 deck was okay with the signal. IIRC according to Sony the window of tolerance for these decks is 2.5 lines. Of course if the deck was set to input reference that would not be an issue. I actually prefer to run external sync for a 5500/5800 to reduce the chance of punching a hole in the master tape if the Avid dumps out of a digital cut. The garbage the Avid spits out when crashing out of record wreaks havoc on the 5500 servo reference when it is locked to video in. When locked to external I've had fewer instances of this problem. It's hard to narrow it down precisely but after adopting external reference I definately have had fewer problems of that nature, coincidence? I think not.

While there is no subcarrier phase there is both horizontal and vertical timing in an SDI system. Of course in a non linear bay with only one source or record at a time the old issues aren't prevalent as in a linear bay. I'm not saying there is a timing function for the Avid sdi out but there are timing adjustments for studio environments etc... So timing is not just for analogue.

--- In Avid-L2@yahoogroups.com, Dennis Degan <DennyD1@...> wrote:
>
>
> On Jan 8, 2010, at 3:34 PM, johnrobmoore wrote:
>
> > Another way around the issue would be to adjust the phase of the
> Avid's output. Anybody know if adjusting the phase in the video output
> tool effects the SDI output? It is labeled as the component phase so I
> don't know if that would effect SDI. Anybody have an idea?
>
> I answer:
>
> Phase adjustment is analog only (component HD-SD and/or composite SD).
> It doesn't affect SDI, as that is self-clocking/timing.
>
> Dennis Degan, Video Editor-Consultant-Knowledge Bank
> NBC Today Show, New York
>

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