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This topic comprises 4 pages: 1 2 3 4
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Author
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Topic: DTS sync.
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Brian Tristam Williams
Film Handler
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Posts: 93
From: Johannesburg, South Africa
Registered: Apr 2002
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posted 07-02-2002 01:13 PM
Hi folks.Yes, I did search for this topic, and received no joy. My question is this: how is it possible for DTS audio to slowly drift out of sync with the picture? We are showing EP2. The distributor insists that we play it in DTS, despite the fact that our largest house also has SDDS and SRD. The technicians come and set the sync, and it's perfect. When they leave, we get complaints. I don't see any problem for quite some time, until I walk into the cinema and the sound is around 1 second out of sync. I rush up to the booth to switch to SR, and by the time I get there the sync is perfect again. I know that if the time-code is lost for more than a few seconds, the switch back to SR is automatic, so I'm assuming it's not that. What we have is a DTS-6D and a Dolby DA20 hooked up to a Sony 3000 SDDS unit. All the readers are on the penthouse. Any tips on this? Even if you can just give me a decent way to trouble-shoot this? I have one idea - monitor the green LED on the reader, using a PC. Is there a way to check the status of this LED, perhaps via the 9-way D-Sub connector? I don't want to have to open the reader up and connect directly to the LED.
------------------ "One man can make a difference."
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Karen Hultgren
Master Film Handler
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Posts: 492
From: Agoura Hills, CA, USA
Registered: Mar 2000
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posted 07-03-2002 12:06 PM
Brian,What model of DTS player do you have? And, it's serial number? Is the whole film out of sync or some reels? Do other films you play also have the sync drift problem? If not, it is a print problem and you should request a new print. If other films do have the same problem, write down the OFFSET setting. Then, get a small flat bladed screwdriver and rotate each (of the two) rotarty switches two full revolutions. Once that's done, return to the OFFSET setting that you wrote down. Sync is determined by counting the number of frames from the DTS reader's lens to the picture aperture and mutiply by 1.25. Subtract one from the result and that is your OFFSET setting. Be sure that is what is selected by the rotary switches on the player. When threading, make the same size loops as you did when measuring the OFFSET. Sync drift is not caused by a faulty reader or bad tension. It could be the rotary switches or the timecode board itself. Please send me an email for more information. Karen at DTS khultgren@dtsonline.com
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Brian Tristam Williams
Film Handler
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Posts: 93
From: Johannesburg, South Africa
Registered: Apr 2002
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posted 07-03-2002 02:37 PM
It's probably not a print problem - we tested it in two other DTS houses, and it performed beautifully. The difference is that those houses have DTS-6ADs, and our largest (yes, it's a huge auditorium, with business-class seats and the largest screen in Africa, possibly larger than anything non-IMAX in Europe, I've been told) 510-seater house has a DTS-6D.What I intend doing tonight is hooking up two processors simultaneously - DTS-6D and DTS-6AD - to the same reader, then comparing their center channels while running through the film. I've borrowed discs from another site. Results tomorrow. By the way, is it true that the DTS disc may have a backup soundtrack? I sincerely doubt this, but this seems to be the understanding of the manager here, who spoke to the technician. The lip sync problem has been apparent with other prints (E.T.), but it was simply 'out', then it was set 'in'. What we have confirmed now, only with Star Wars, is that it is, in fact, drifting.
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Ken McFall
Jedi Master Film Handler
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Posts: 615
From: Haringey, London.
Registered: Apr 2001
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posted 07-03-2002 03:06 PM
I had a similar problem at our cinema in Aberdeen, that I service. with three DTS 6D.I would test the whole thing out and find no problems.... A few days later they would phone and say they had wow and out of sync. DTS suggested I upgrade the firmware to the latest version as this was a known problem, which I've done and no complints since. I've also done the same at my own theatre where we have two DTS 6 units. NO problems of any kind EVER! I can't rememebr excatly what the firmware version I upgraded to is (possibly 1.24 from memory?). It may be worth checking that out. The IC is normally clearly labeled with it's version number so check it out. DTS are VERY helpful in evey way so give them a call and they will keep you right and supply the required IC's. Regards Ken.
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