DTS 70mm
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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 Presented in 70mm with digital DATASAT sound (Formerly DTS) Internet link: |
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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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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