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Author Topic: Audio Described Films
Andy Johnson-Smith
Film Handler

Posts: 1
From: Spalding, Lincs, UK
Registered: Apr 2013


 - posted 08-13-2013 07:57 AM      Profile for Andy Johnson-Smith   Author's Homepage   Email Andy Johnson-Smith   Send New Private Message       Edit/Delete Post 
Hi there. We have been approached by a customer enquiring about audio described films. We have a system in the building to deal with it, but all we get from our processor on channel 7 & 8 seems to be suuround noise. Any ideas? [Cool]

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Edgar Prass
Film Handler

Posts: 32
From: Tartu, Tartu county, Estonia
Registered: Mar 2013


 - posted 08-13-2013 09:03 AM      Profile for Edgar Prass   Email Edgar Prass   Send New Private Message       Edit/Delete Post 
I think that you may be confusing audio description (which are headphones that can play narration of action scenes for blind filmgoers) with hearing impaired system (which boosts movies volume in headphones). Those two have totally different purposes.

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Harold Hallikainen
Jedi Master Film Handler

Posts: 678
From: Denver, CO, USA
Registered: Aug 2009


 - posted 08-13-2013 10:24 AM      Profile for Harold Hallikainen   Author's Homepage   Email Harold Hallikainen   Send New Private Message       Edit/Delete Post 
Many, but not all, movies now have a VI-N track. Look for VI in the DCP name (see http://www.digitalcinemanamingconvention.com/unabridged.asp ). According to the Interop channel map at http://isdcf.com/papers/ISDCF-Doc4-Interop-audio-channel-recommendations.pdf , VI-N is typically placed on track 8. If the digital cinema server is doing 1:1 routing, this would appear on AES/EBU channel 8.

Some processors only handle 8 channels, which is fine for 5.1 with HI/VI-N. But, if you're running 7.1, you need more channels. Fairly often people route Lrs/Rrs to AES/EBU channels 7 and 8 (either in the server or by hard wiring). This leaves no path for the VI-N on 8. But, if you're running a 5.1 auditorium, you SHOULD be able to get VI-N on channel 8.

To handle situations where you need just a couple more channels converted from AES/EBU to analog, USL provides the DAX-202.

Good luck!

Harold

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Dave Macaulay
Film God

Posts: 2039
From: Toronto, Canada
Registered: Apr 2001


 - posted 08-13-2013 10:51 AM      Profile for Dave Macaulay   Email Dave Macaulay   Send New Private Message       Edit/Delete Post 
To give you a real idea of how to get this, we need to know what server and sound processor you have, also what external D-A converter if you don't have a digital-in processor. There are a lot of possible solutions to get a headphone system with HI and VI sound.

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Marco Giustini
Film God

Posts: 2535
From: Reading, UK
Registered: Nov 2007


 - posted 08-13-2013 03:07 PM      Profile for Marco Giustini   Email Marco Giustini   Send New Private Message       Edit/Delete Post 
If you have surrounds from your channel 7/8 I suspect you are listening to the back surrounds.

If your system is 7.1, your cabling should prevent that.
If your system is NOT 7.1, you should not run 7.1 CPLs.

Either way, there is something wrong:)
Please let us know the equipment being used.

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