SMPTE Question

[Tim Farrant]

Originally Posted by stevep

when locking the multi track , to pro tools
using the tape as master

can i use the big ben clock in the Apogee 16x while locked to smpte with the sync io ?

No, you need to use the clock out of the Sync IO because it is locking to the timecode.

also can i use the sync io to generate smpte to lock the consoles automation or do i need to print smpte on a audio track on pro tools.

No, no need to print it, you can do a split of the multi track timecode with a Y cable and feed 1 into Sync IO and 1 into the console automation. Thats what we used to do anyhow.

Tim

[stevep]

What if I make Protools the master, and the studer the slave, then can i use the word clock in the 16X ?


Thanks,





steve

[XSergeantD]

yes, if you have a pair of synchronizer units. Rewind time will be slow as the studer will not chase till the synchro see's a burst of TC from PT.

[by-tor]

I am pretty sure that you could tell pro-tools to clock off of the apogee but chase incoming timecode. In the session set-up window just choose clock source as wordclock (or whatever) and positional reference as LTC and go online. Pro-tools will wait for incoming TC.

To answer your other question. Yes the sync i/o can generate TC. Just make sure you choose Generate in the session set-up window and you must be ONLINE for it to actually output TC.

Hope that helps.

[stevep]

Thanks guys,







steve

[Rail Jon Rogut]

Originally Posted by by-tor

I am pretty sure that you could tell pro-tools to clock off of the apogee but chase incoming timecode. In the session set-up window just choose clock source as wordclock (or whatever) and positional reference as LTC and go online. Pro-tools will wait for incoming TC.

Sure -- but if the SMPTE isn't synchronous with the word clock and resolved to the same clock you're not going to achieve lock -- you'll achieve trigger. For true synchronization you need TWO things... speed and location -- both devices need to be running at the same speed. If you have a MicroLynx synchronizer you can feed Word Clock to both Pro Tools and the MicroLynx and use LTC to trigger playback of Pro Tools... and because they're both resolved (clocked) to the same clock source they'll run at the same speed.

When you print your SMPTE make sure the generator is clocked to the same clock reference you'll use later so that the synch words are synchronous with the word clock -- so when you resolve it later it plays back at the same speed.

Most professionals use video black burst to clock for analog transfers.

Rail

[by-tor]

Originally Posted by Rail Jon Rogut

Sure -- but if the SMPTE isn't synchronous with the word clock and resolved to the same clock you're not going to achieve lock -- you'll achieve trigger. For true synchronization you need TWO things... speed and location -- both devices need to be running at the same speed. If you have a MicroLynx synchronizer you can feed Word Clock to both Pro Tools and the MicroLynx and use LTC to trigger playback of Pro Tools... and because they're both resolved (clocked) to the same clock source they'll run at the same speed.

When you print your SMPTE make sure the generator is clocked to the same clock reference you'll use later so that the synch words are synchronous with the word clock -- so when you resolve it later it plays back at the same speed.

Most professionals use video black burst to clock for analog transfers.

Rail

Yeah. Good point. I was just thinking sure...here, use your apogee clock. But yeah. It would not be totally "locked"....

[XSergeantD]

Does the Microlynx have wordclock in and how is that utilized? Most synchronizers I know reference via it's internal crystal , tach pulse or an external video reference, not wordclock.
How is wordclock referenced to SMPTE? SMPTE has 2 main characters, rate and type. Type consists of drop/non-drop and rate being 30 or 29.97 which can be referenced to color or BB (then there's also 24 and 25). An LTC databit contains 80bits to render each frame and the last 16 bits make up the sync word which tells the reader the frame boundary, tape direction, and the bit-rate of the sync tone.

I hope this doesn't sound sarcastic as I do want to know if I've been missing something

[Rail Jon Rogut]

Yes, the MicroLynx can accept Word Clock (as I stated in my previous post).

SMPTE should be synchronous to your Word Clock in a digital system or with video reference if you're using analog and want repeatable playback speed.

There is a cached document I found via Google: Link

Rail

[XSergeantD]

Ah, I'll check the link, sounds like word is clocking the internal crystal or video ref which in turn would clock the LTC, that would make sense. I couldn't see where word clock would 'sync' up w/ LTC's sync word.

[Rail Jon Rogut]

No, instead of using the internal crystal (which has thermal drift), or video reference.. it's using the external clock to line the synch words up with the leading edge of the word clock on frame boundaries.

Rail