Yes, I've been told that sound negative exposure is a very tricky procedure. Someone once also told me that for a big feature, they used to expose three negatives at slightly different exposures, then listen to them and select the best sounding one.
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Mark,
Actually it was very scientific and methodical.
At NT Audio the client would order how ever many OSTNs were required for the release with their different versions / regions.
Every batch of sound negative stock (typically Kodak 2374) that was received, cross-modulation tests would be performed for silver, high-magenta and cyan printing for each lab. In the heyday it was DeLuxe, Technicolor and FotoKem. Once the results were analyzed, a chart would be posted on each camera for the recordist to use depending on the work order.
NT would shoot the OSTN (Optical Sound Track Negative), develop it and run it through a negative QC rig before sending it out for printing.Comment
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David,
In the SDDS DFP-2000 system there are three clocks that have to be working in order to play out audio.
1. The master clock on the APR-6 board.
2. The photo-interrupter clock behind the sprocket. Perhaps the interrupter wheel needs dusting out.
3. The clocking of data from the film that is being read.
If one or more of those are not functioning properly, the system will not play audio.
Regarding board failures: Typically the DEC board with the ATRAC chips would fail due to the heatsink not making good contact with the chips and them going into thermal breakdown.
Hope this helps.Comment
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