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DTS 70mm
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Read more
at in70mm.com The 70mm Newsletter |
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| Written by: Peter Fearn, DTS Service Engineer & Paul Rayton | Date: 15 January 2007 | ||||||||||||||||
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More
in 70mm reading: What is DTS 70mm Internet link: DTS Free Techcenter DTS Europe 5 Tavistock Estate Ruscombe Lane Twyford Berkshire RG10 9NJ UK Tel: +44 118 934 9199 Fax: +44 118 934 9198 |
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| To play "special venue" DTS, you of course must already have the two
"inner" sound channels available, including the amplifiers and the
speakers. Most contemporary films are not mixed to use these channels,
so many cinemas today are not equipped with them. So, first of all, you
must make sure they are available -- and working. For getting the DTS "special venue" sound to these proper speakers, you need some way to re-direct the sound channels from the DTS processor into the proper pre-amplifiers and thence into the appropriate auditorium speakers. There are various ways to accomplish this, and the specifics vary somewhat depending on what type of DTS processor you have. There are several DTS processors out there now, including -- among others -- the DTS-6, DTS-6AD, and the DTS-XD10. The DTS-6 cannot be used as Special Venue it is the DTS-6D that can be upgraded. The simplest method is to simply make up an "adapter wire", which you can plug into the output of your DTS processor, and which re-directs the sound to the appropriate pre-amps, etc. This is cheap to prepare, but requires time to install (and/or remove) whenever you change formats. And you will need to consult with DTS and/or your theatre's audio technician to get the pin assignments for the sound coming out of your processor. Care must be taken in this, as you can end up with screen dialogue sound coming out of surround speakers, or other undesirable effects. If you have the newest systems from DTS (the XD-10), sound is held on the system's hard drive (the XD10 does 6.0 as well as 5.1 and 8 channel. This is all included in the Audio license). In that system, sound may be taken out in the AES-EBU digital format and routed into the theatre system digitally. To do this definitely requires a consultation with DTS and your theatre's audio technician, and some aspects of that will depend on what other equipment is installed in your cinema. There is also at least one extra chip (from DTS) which must be installed in the processor. This chip is essential to allow the audio for the extra channels (channels 2 and 4) to be treated as full range audio, and be routed appropriately. This chip must be obtained from DTS as it is programmed by them to work with their processor. It's not all that expensive, but it is necessary. And again, that's why you need to have DTS (or a certified engineer) come over at least once to modify the equipment for such sound playback. There are ways to make relay boards that can be manually switched between DTS modes, but such relay boards are not available "ready to order", but DTS may be able to help you. It's relatively easy to do all this to get the original sound mixes to play. But it has to be done correctly, or sound will be in the wrong places in your auditorium! |
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How do I upgrade to DTS Special Venue? |
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| To upgrade to
DTS 70mm Special Venue all that is needed is an extra APTX I/C
(integrated circuit). This is placed in the spare socket (bottom row,
middle socket) on the D536 audio board. Unfortunately the D536 needs to be Rev D, the later Rev H cards do not use APTX I/Cs to decode DTS. The APTX I/C went obsolete and the board was redesigned. There are a few other things you need to have for Special Venue to work: 1. V1.46 time code software, and 2. AQRM_RC or latter, unit software (the latest version is V2.54.40). 3. A good idea would be to have the SV setup disc to check channel assignments. Unfortunately DTS do not do a Special Venue test film, but the Special Venue setup disc will only self play in a Special Venue 6D player. Below is the upgrade kit, it has all you need to convert a 5.1 6D to a 6.0 6DSV. Unfortunately it assumes you have a rev D, D536 audio card: |
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Types of files on DTS Special Venue Discs |
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| There are 3 different types of file on the disc for Special venue.
Basically it is down to if there is time code on the film. If there is then a 70mm reader head is required and all should work. If there is not time code on the film and it is less than one disc in length (only on CDrom not two) then the unit can reed SMPTE from the tachometer. If there is no time code on the film and the sound needs to be put on two discs, then an E175 (Tach to time code converter) is needed. You input the serial number of the film into the E175 and it automatically goes to the next reel number as the Tach signal increments. |
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| Go: back
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- news index Updated 26-01-10 |
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The DTS 70mm digital sound process for motion pictures is designed to play
in cinemas that are equipped for 70mm projection and 6-track stereo. It is
a dual system in that the digital audio data is recorded on CD-ROM discs.
A special time code is printed on the 70mm motion picture film and is
located outside the sprocket holes. DTS 70mm prints do not have
conventional magnetic striping, so, analog sound cannot be used. For
fail-safe operation, a second DTS playback unit is required.
The
70mm reader on a DP75