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Author Topic: distorted audio output (AKA: Robosound) Jorgen Larsen Film Handler Posts: 18 From: Denmark Registered: Jun 2009 posted 05-12-2013 06:44 PM                     This problem is also known in Denmark. We have not yet seen a solution to the problem, but it helps to switch to an analog format (05 or 04) and back again as Steve writes. But you will unfortunately have to "rewind" the movie back a little so the audience can see the sequence again. I hope that soon there will be a solution to this annoying problem. Incidentally, it seems that all digital cinemas in the world are facing similar problems.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 05-13-2013 01:19 PM                     all digital cinemas with CP650 and cat 790! This is not an issue if using any other solutions.  |  IP: Logged Mohd Ridzuan Film Handler Posts: 25 From: K.L , Malaysia Registered: Jul 2012 posted 05-30-2013 04:50 AM                     Hi All, Just want to share mine. i've installed many doremi with cp650. some with 790 some without 790 card. without the 790 card i use USL Dax-602 (D-A converter) and with 790 card it's ok for a while likely about 1 month. After that the popping sound happen. i try to install the odyssey card also sometime its happen. So for now on i just install the USL Dax-602 to prevent any popping sound. Please advise or suggest if there a better method Thanx Mr. Wan  |  IP: Logged Peter Angelo Bua-ay Film Handler Posts: 8 From: Quezon city , Philippines Registered: Mar 2013 posted 05-31-2013 10:25 PM                     Thanks for all your sharing and comments. Since the cinema can't provide DA converter for now, what we did was to disable the surrounds sound (Ls,Rs and back surrounds). We observed that by disabling the surrounds eliminate the popping/robosound but of course with a lesser quality of sound.  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 12-01-2017 09:39 AM                 It has been 1644 days since the last post.  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 12-01-2017 09:39 AM                     I'm back to researching this because I have a site that has had the problem in two different auditoriums recently. I'm not about to disable the surrounds, but I'm quite curious as to how that would prevent this issue from happening. Peter, how exactly did you disable the surrounds, and has it totally prevented the issue from reoccurring, or has the problem returned? (I figure four years would be long enough to determine if the problem is gone!)  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 12-01-2017 10:23 AM                       I would assume they turned the amps off. Don't see what useful info you are hoping to learn here. By now they've probably switched to another processor.  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 12-01-2017 01:33 PM                     I had this problem at one location, and as Sam says, the easiest way to deal with it was to turn off the surround amps. - - But not permanently! Since this was an intermittent problem, that only occurred once every several months, killing the surround amps was the quickest way to "fix" the affected show until a complete re- boot could be done before the next scheduled show. Never had anyone complain about the surrounds being off. I doubt they even noticed. They were just glad the 'noise' was gone. Even though this problem only happened once every 3 or 4 months, the staff kept whining that it was "too much trouble" to go up and turn off a couple of switches in the booth to kill the surround amps, or do a re-boot. So the theater eventually replaced the processor. (But if it were up to me, I would have replaced the staff)  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 12-01-2017 03:18 PM                        When we converted, we had intermittent problems, which sound something like what's being reported here. Our initial installation was with Doremi's D-A converters. Replacing them with USL's converters fixed the problem (drive-in. We don't use processors here). It appears our problem was related to electrical noise, getting into the unshielded CAT-5 lines the installer used to run audio to the converters, which USL's appear to be less sensitive to.  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 12-01-2017 04:05 PM                     What I'm hoping to learn here, Sam, is if the site found another temporary remedy other than stopping the show and rebooting the processor. I would not for a second assume that they replaced the processor. There are tons of these out there still running. Jim, I'm not sure that the problem you describe is the infamous "robosound." I could be wrong, but I thought that was on all channels. Is CP-650 robosound unique to the surround channels?  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 12-01-2017 05:07 PM                       Ken, I guess but there are may more recent robo sound cases than one in Philippines. It can be a maddening issue to sort. I have a couple in my area and yet I've never heard it for myself. Everything I've ever heard about this involves the 790 card and the surround channels.  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 12-01-2017 07:48 PM                     Dolby has a beta CP650 firmware to get rid of the robosound issue. You can contact them to get it if you need it. One side effect the beta software has is a pop in the sound when switching between digital and analog inputs.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 12-01-2017 10:18 PM                     The beta software reduces the issue, but it doesn't fix it completely.  |  IP: Logged

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