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Author Topic: Cinema room calibration test tone suggestions Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-19-2015 02:29 PM                     Didn't you bring up the issue with different PN ref levels in different cinema processors? There's your benefit. Not mentioning possible server-side mixdown/level options (SMPTE DCPs, etc.), so the benefit is there as there is a benefit in playing your colors from the server instead of the projector. Who cares about the size of an audio-only (blackj image) long DCP? And who cares about looping? A Doremi will do it as a simple Cinelister-Option, not even a need for a looping SPL. Aside from the fact that THIS SMPTE reference-noise will be built into all future CPs as a logical consequence, instead of proprietary patterns used so far. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-19-2015 03:02 PM                     it'll be a good thing but I feel the PN level issue is in the past now. The differences now are subtle and as mentioned it won't matter if you end up playing your film at 7.0 or 6.7 - not to mention that nobody will do that anyway  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-19-2015 04:21 PM                     When you look at the variations in commercial pink noise sources demonstrated in the links I posted, the variations certainly are not small. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-19-2015 05:15 PM                     In my world I care about Dolby and Datasat and the difference is small. I do notice that when I run PN from the server. As said, it'll be a good thing.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-19-2015 05:21 PM                     The problem starts when you do not trust the PN from your CP (which started this thread) and think you need an expensive accurate external source, and your own metering to confirm this ;-) - Carsten  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-20-2015 07:28 AM                     As I said...it might make the case for a final tweak of the levels at the very end and if you have a preferred sound processor, odds are you can determine what the offset is when tuning that processor (e.g. add 2dB to the level when tuning). I don't dispute the value having reference PN to test against...it will also give all processor manufacturers a reference to test their internals against when designing product too. One would think that after the reference is made, then future designs will be made to match it. Of course, there are forces within the SMPTE and audio community in general to change how we measure and tune sound too.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-20-2015 08:26 AM                     That's right. Once we do have SMPTE DCinema PN patterns, we may soon be urged to not use it anymore because of modernized calibration methods... - Carsten  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 06-20-2015 11:22 AM                        The SMPTE modern calibration group is using pink noise. They are developing a transfer function for the sound system (including auditorium) by correlating the signal driving the sound system with what the microphones pick up. I think that any wideband signal would work. Harold (member SMPTE groups on modern calibration, pink noise, stereo subtitles, immersive sound, and probably a few more)  |  IP: Logged

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