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» Film-Tech Forum   » Operations   » Film Handlers' Forum   » Weird Dolby Digital Error Display

   
Author Topic: Weird Dolby Digital Error Display
Ray Derrick
Master Film Handler

Posts: 310
From: Sydney, Australia
Registered: Sep 2001


 - posted 04-19-2002 07:13 AM      Profile for Ray Derrick   Email Ray Derrick   Send New Private Message       Edit/Delete Post 
I was speaking with a projectionist recently who reported a curious error display on his DA20's any time he ran the Charlotte Gray trailer. As the trailer began, the error rate indicator displayed the following numbers in sequence:

0,1,2,3,4,5,6,7,8,9,R,6,C,D,E,F
followed by:
0,1,2,3,4,5,6,7,8,9,R,6,C,4

30 seconds later the same thing happened again except the second string was slightly shorter.

The film played in digital the whole time.

My first thought was that there is actually somebody at Dolby with a sense of humour, but of course that is a ridiculous proposition

Then I thought maybe it has something to do with code downloading from the film to the DA20 (but on a trailer?).

Does anyone know what this all means? I am curious.


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Ray Derrick
President/Chief Engineer
Panalogic Corporation Sydney, Australia
Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935

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Bruce Hansen
Jedi Master Film Handler

Posts: 847
From: Stone Mountain, GA, USA
Registered: Dec 1999


 - posted 04-19-2002 09:41 AM      Profile for Bruce Hansen   Email Bruce Hansen   Send New Private Message       Edit/Delete Post 
Did something on the trailer trigger a display test function? If the "R" is realy an "A", and the second "6" is realy a "b", then that is hex 0 through 15 (0-9, and A-F).

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Ray Derrick
Master Film Handler

Posts: 310
From: Sydney, Australia
Registered: Sep 2001


 - posted 04-19-2002 06:24 PM      Profile for Ray Derrick   Email Ray Derrick   Send New Private Message       Edit/Delete Post 
Yes that occurred to me too, but I couldn't remember if the error display is alpha-numeric or just numeric. If it is the latter then it would indeed be a hex count. But why did this happen in the first place?

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Ray Derrick
President/Chief Engineer
Panalogic Corporation Sydney, Australia
Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935

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Gordon McLeod
Film God

Posts: 9425
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 04-19-2002 07:13 PM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
Possibly the trailor contained update for the software in the DA20 and that was it uploading

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Joe Redifer
You need a beating today

Posts: 12859
From: Denver, Colorado
Registered: May 99


 - posted 04-19-2002 07:43 PM      Profile for Joe Redifer   Author's Homepage   Email Joe Redifer   Send New Private Message       Edit/Delete Post 
Question:

When a print has an update for the Dolby Digital unit, does it upload and update the unit each time the film is played? Or does the decoder know it has been updated and ignore that particular code?

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Joe Beres
Jedi Master Film Handler

Posts: 606
From: Minneapolis, MN, USA
Registered: Nov 2000


 - posted 04-19-2002 07:47 PM      Profile for Joe Beres   Email Joe Beres   Send New Private Message       Edit/Delete Post 
Another Question: I don't know DA-20s specifically, but if the film was updating the software, wouldn't have kicked into analog for a moment to re-initialize the digital decoding software?

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Stephen Jones
Master Film Handler

Posts: 314
From: Geelong Victoria Australia
Registered: Jun 99


 - posted 04-19-2002 08:51 PM      Profile for Stephen Jones   Email Stephen Jones   Send New Private Message       Edit/Delete Post 
When a print has a software update for a DA20 encoded into the Digital track it does what ray has described eg. 0 - 10 and in the reverse 10 - 0 and it only does that once.When the print is played again in that theatre the DA20 reconizes that it has the software update and won't load it again, this of course happens in each theatre you run that print in that has a DA20.
But it is unusual to get a update on a trl I have only had them on prints.Dolby dont say which prints have updates on them you only know when the DA20 does the 0-10 thing etc.The sound remains in digital while this happens.

Steve


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Mark Hathaway
Film Handler

Posts: 31
From: Australia
Registered: Nov 2001


 - posted 04-19-2002 09:03 PM      Profile for Mark Hathaway   Email Mark Hathaway   Send New Private Message       Edit/Delete Post 
almost as weird as the cat673 card flashing "HELP ME" after comming back from dolby for repair

Mark hathaway

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Rick Long
Jedi Master Film Handler

Posts: 759
From: Toronto, Ontario, Canada
Registered: Nov 1999


 - posted 04-19-2002 10:47 PM      Profile for Rick Long   Email Rick Long   Send New Private Message       Edit/Delete Post 
I would love to see this. Can anyone list any current trailers that have updates on them? Thanks.

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Pete Naples
Phenomenal Film Handler

Posts: 1538
From: Dunfermline, Scotland
Registered: Feb 2001


 - posted 04-22-2002 12:20 PM      Profile for Pete Naples   Email Pete Naples   Send New Private Message       Edit/Delete Post 
Yup, it's dynamic upload going on. I thought they only did this on feature prints. We used to get a 'heads up' warning when an update was going to be released, so that you could then field all the calls from projectionists going 'my DA20/CP500 has gone nuts, then it rebooted'. Joe, yeah the DA20 or the DA20 sus-section in the CP500 must re boot when the new code is loaded so it can be utilized. It will of course revert during that reboot. I can't remember as I haven't seen it for ages, but I have a feeling that the re boot will appear in the CP500 event log.

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