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Author Topic: Cinema room calibration test tone suggestions Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-14-2015 05:11 PM                     How do you measure it?  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-14-2015 05:30 PM                     Pink noise CPL from server.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-14-2015 05:40 PM                     What meter?  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-14-2015 05:44 PM                     ops, sorry. WinRTA.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-15-2015 04:06 PM                     quote: Marco Giustini Automatically, when a 5.1 format is selected on a 7.1 system? That was not the case when I tried, I had to dial a -2dB manually. I was checking with PN from the server. You need to enable this in format options. Don't know since which firmware revision it is there, it was there when we installed our AP20 two years ago. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-16-2015 04:19 PM                     There is a "surround offset" which can be manually set. But last time I checked, when running 5.1 levels were not automatically adjusted.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-16-2015 07:36 PM                     It's under format and decoder options (also for HDMI 5.1/6.1/7.1) surround handling. I went into it today. A 7.1 capable CP without that function is pretty useless. But as I said, the AP20 has enough format specific config options to adjust it also on the levels page. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-17-2015 02:55 AM                     Unless you mean the "5.1 DCP on 7.1 system", which does what it says but does not pad the level, can you post a screenshot? I remember the similar option in the HDMI decoder option, never tested that because the lack of a 5.1/7.1 pink noise DVD/BD.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-17-2015 10:46 AM                     No, they are not 'automatically' adjusted, that is true. 5.1 and 7.1 are two separate formats on the AP20, unlike on the Dolby CP750, where 7.1 is an add-on function on top of a 5.1 setup. If you set the '5.1 on a 7.1 setup' format option on the AP20, it shows the signal routing and gives a hint that surround levels should be padded by 2dB, and if you do this, it is automatically applied to all surround channels. -Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-17-2015 03:28 PM                     Yep. Better approach than QSC but I feel it should be automatic with the possibility to tweak the level manually if needed. ALSO, they really need to make sure the pink noise levels are NOT affected by the "surround offset"...  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-18-2015 02:38 PM                     Here is some interesting read regarding pink noise in the cinema environment: http://www.ohl.to/about-audio/how-pink-is-pink-noise http://www.meyersound.com/pdf/cinema_technical_papers/cinema_calibration_tech_report.pdf - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-18-2015 03:23 PM                     Oh cheers, I was actually looking for that! I remember reading it somewhere but could not remember where!  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-18-2015 03:56 PM                     SMPTE is working on an official cinema pink noise pattern and reference DCP, so, once this is done, we will have an official standard independent from specific cinema processors or external generators. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-18-2015 04:17 PM                     It's just taken 20 years!  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-19-2015 06:09 AM                     We've had reference Pink Noise in both magnetic and optical form. However, the playback medium has been the limitation and said reference film has been used to just calibrate the playback device (optical or magnetic head). So those of you that want to tune with a DCP reference...how long is this test material? Who wants to either have it looping or keep pressing play again after it runs out? And after that, to what benefit? How different is the various pink noises going to be as compared to the speakers, rooms, microphones and the various analyzers used to measure it? The only value I could see is after you've tuned a room, to use it as a reference level source to fine tune the levels. That and also come up with an offset to the internal PN of your favorite processor. At least with the color targets for calibrating the projector, one can pause the show and freeze the target for as long as it takes to make a stable measurement.  |  IP: Logged

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