strange clocking with adat and spdif

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Havoc
Posts: 81
Joined: Fri Aug 03, 2001 4:00 pm

Post by Havoc »

When using the pulsar in as slave to adat1 input, and having a cd player connected to the spdif, the pulsar cannot achieve a stable clock. It always looses lock after a couple of seconds. Even when set as master this goes on. I have to delete the spdif source to get it working. With no spdif it runs as master or as slave without problems.

Is this normal? I still run V3.01.
subhuman
Posts: 2573
Joined: Thu Mar 29, 2001 4:00 pm
Location: Galaxy Inside

Post by subhuman »

Many SPDIF devices require themselves to be clock master (most MiniDisk players, CD players, synths with SPDIF out do...) You will only get stable clock from a high quality clock master, and only when you have one master in your system. (Excuse me if you already know all this)

Therefore if you have a device such as an MD player (or similiar) connected digitally, it's probably easiest to set it as master temporarily while you get audio off the device, etc. Remember to set your Master clock back when you're done.

Also keep in mind the SPDIF spec doesn't allow one device to slave while also being master, Pulsar2 has a workaround to allow this.
Havoc
Posts: 81
Joined: Fri Aug 03, 2001 4:00 pm

Post by Havoc »

Yes, that is the strange part of it. Even with one master, it behaves like a 2 master system. Maybe I was no clear enough explaining the setups:

1: CD: master; Pulsar: slave to spdif; adat:sync to opt
2: CD: connected; Pulsar: master; adat: sync
tried also
3: CD: connected; Pulsar: slave to adat1; adat: master

adat or pulsar in 44.1

In all 3 the modes when I want to record from adat the pulsar cannot lock. I have to delete the spdif module, otherwise intermitent clock (pulsar looses lock, adat out of sync).
ohmelas
Posts: 202
Joined: Sat Jul 28, 2001 4:00 pm
Location: Milwaukee, WI USA
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Post by ohmelas »

There might also be 2 cents worth here:

There was an upgrade to Pulsar a while back that worked out this problem with the SPDIF. There was a sync problem with the SPDIF clocks on the Pulsar I boards and the outside world.

The patch that was on CW's website could be downloaded and that fixed the problem. This was back in 2.04 days, though so I don't know what version you're running and I hope that this helps if switching the clocks hasn't worked.
Howard Salter Dot Com
Musician, Marine Corpsman, and Father
Milwaukee, WI USA
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