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Topic: XD10 w/SMPTE timecode
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Daniel Schulz
Master Film Handler
Posts: 387
From: Los Angeles, CA USA
Registered: Sep 2003
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posted 10-28-2017 11:02 AM
quote: Pete Naples
Was there ever a 'Special Venue' (SV) version of the XD10?
On the DTS 6D SV you can kick switch between DTS and SMPTE TC via a jumper, I used to wire a toggle switch across said jumper to make life that bit easier.
There was some issue with the DTS vs SMPTE TC I recall, had something to do with reel numbers.
There was not a separate SV version of the XD10. In addition to the timecode switch, the 6DSV had an additional APTX processing chip (so 6 instead of 5) so that it could process 6 discrete channels of audio (many Special Venue applications used IMAX-style audio setups, with 6.0 mixes including a Voice of God channel, rather than conventional 5.1). The XD10 was always a full 8 channel unit, so a separate SV variant was not needed.
I don't remember how to switch from DTS mode to SMPTE mode, though.
The main issue with using SMPTE mode (if you can call it an issue) is that it was typically sourced from a tach-to-timcode generator and so ran as a longplay. If at any point you lost sync, or if your print didn't match your soundtrack, it wasn't easy to regain sync. Printed DTS timecode on the film, OTOH, was constantly relaying reel and frame information to the player, so perfect sync was maintained throughout the presentation.
That said, a lot of Special Venue sites ran DTS/Datasat units for years on end in SMPTE mode. It was a pretty robust system.
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Pete Naples
Phenomenal Film Handler
Posts: 1565
From: Dunfermline, Scotland
Registered: Feb 2001
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posted 10-29-2017 05:10 PM
quote:
quote: Pete Naples
Was there ever a 'Special Venue' (SV) version of the XD10?
On the DTS 6D SV you can kick switch between DTS and SMPTE TC via a jumper, I used to wire a toggle switch across said jumper to make life that bit easier.
There was some issue with the DTS vs SMPTE TC I recall, had something to do with reel numbers.
There was not a separate SV version of the XD10. In addition to the timecode switch, the 6DSV had an additional APTX processing chip (so 6 instead of 5) so that it could process 6 discrete channels of audio (many Special Venue applications used IMAX-style audio setups, with 6.0 mixes including a Voice of God channel, rather than conventional 5.1). The XD10 was always a full 8 channel unit, so a separate SV variant was not needed.
I don't remember how to switch from DTS mode to SMPTE mode, though.
The main issue with using SMPTE mode (if you can call it an issue) is that it was typically sourced from a tach-to-timcode generator and so ran as a longplay. If at any point you lost sync, or if your print didn't match your soundtrack, it wasn't easy to regain sync. Printed DTS timecode on the film, OTOH, was constantly relaying reel and frame information to the player, so perfect sync was maintained throughout the presentation.
That said, a lot of Special Venue sites ran DTS/Datasat units for years on end in SMPTE mode. It was a pretty robust system.
Thanks Daniel,
I only ever dealt with the 6DSV. Many years ago I had to replace a failed 6DSV with a 6D, moving that IC you mentioned to turn my replacement 6D into a 6DSV. Nerve wracking stuff as I was in the middle of nowhere and didn't have the appropriate IC extractor. However with some Macgyvering I managed.
The DTS / SMPTE TC switch was accomplished via a jumper, I can't remember if it was on the MB or one of the DTS boards. Anyway as I said I wired a toggle switch across it to make the switching simple.
The venue in question went to DTS TC from the films because, initally they had been playing true SV films, which tended to be around 40 minutes long. Laterally they started playing feature length 8/70 films and 5/70 films. There was some issue once you hit the 1 hour mark with the TC generator, I can't remember the details now. Too long ago.
The place in question was still using a Peavey CinemAcoustics processor until last year! It had been fed by the DTS6DSV via the proprietary DTS digital output.
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