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Author Topic: distorted audio output (AKA: Robosound) Peter Angelo Bua-ay Film Handler Posts: 8 From: Quezon city , Philippines Registered: Mar 2013 posted 04-27-2013 10:36 AM                     Cinema Set up: Server - Doremi showvalt IMB Projector - CP2230 Audio Processor - Dolby CP650 The problem is when it comes to part of the movie/features that has high sound effects, the audio become distorted. And when it become distorted, it will become distorted to till the end and till the last show. Amplifiers are not clipping, audio processor is also working fine (tried also to replace to processor but same problem occurred. Is my assumption that the IMB is the causing problem? Does anyone already experience this same kind of problem and how does it resolved. Admin edited subject for clarity on future searches [ 04-27-2013, 12:48 PM: Message edited by: Brad Miller ]  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 04-27-2013 11:15 AM                     Search the forum for 'Robosound' - it seems the CP650 causes that problem when using the digital inputs from the IMB. I don't think the Doremi causes that problem. - Carsten  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 04-27-2013 12:47 PM                     Ditto to Carsten's comment. Just power cycle the CP650 sound processor the next time it happens and the outstanding odds is it will wake back up and be happy again. There is no known/proven "fix" for this (other than to use an external D to A converter and go into the CP650 via format 11, which is what we do).  |  IP: Logged John Thomas Film Handler Posts: 75 From: Boston, MA Registered: Sep 2011 posted 04-27-2013 06:13 PM                     I thought someone said a replacement Cat. 790 could fix this, if you got a "good one." Is this not the case?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-27-2013 06:33 PM                     It is clear that some CAT 790s are more prone to this than others...we had a customer that had an issue with a CAT 790 (new) and upon replacing it, the Robosound never returned. Dolby is working on a software fix to the problem but nothing has been released, to the best of my knowledge. I try to avoid using the CP650 for DCinema except in mixed film/digital systems and even then just let the CP650 handle the film.  |  IP: Logged Peter Angelo Bua-ay Film Handler Posts: 8 From: Quezon city , Philippines Registered: Mar 2013 posted 04-27-2013 06:42 PM                     I've already replaced the CAT790 board and also the whole processor too. Miller, If this is a bug on cat790 board, is there a fix available now from dolby?  |  IP: Logged Manny Knowles "What are these things and WHY are they BLUE???" Posts: 4247 From: Bloomington, IN, USA Registered: Feb 2002 posted 04-29-2013 09:07 PM                     quote: Brad Miller There is no known/proven "fix" for this quote: Steve Guttag Dolby is working on a software fix to the problem but nothing has been released, to the best of my knowledge.  |  IP: Logged Peter Angelo Bua-ay Film Handler Posts: 8 From: Quezon city , Philippines Registered: Mar 2013 posted 04-30-2013 08:54 PM                     meaning additional cost again to cinema exhibitor for additional converter..  |  IP: Logged Manny Knowles "What are these things and WHY are they BLUE???" Posts: 4247 From: Bloomington, IN, USA Registered: Feb 2002 posted 04-30-2013 11:10 PM                     I think Brad is saying that right now the safest solution seems to be using the analog inputs via a D-A converter. But, in the future, if Dolby can resolve this, it may be something that can be addressed via software. In which case, one would hope it would be offered as a free software update. (Or firmware, etc) One would hope...or expect...the fix would be free. FWIW, I have not experienced Robosound for well over a year now. IIRC it showed up right away and we ended up replacing with a whole new 650 and 790. (Now, I better go knock on wood.)  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 05-02-2013 08:35 AM                     I've read about this issue on this forum over the last couple of years. I only have 7 CP-650's, not a very large number. To my knowledge, unless the staff are rebooting the processor when the issue occurs and not informing me, that site has not experienced this problem. All 7 use the Cat. 790, no external D/A converters. Is the problem isolated to a certain vintage of Cat. 790? Like, bad componentry prior to a certain serial number? Any theories as to why none of my CP-650's (again, to my knowledge) have experience this issue, while others report it happening frequently?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-02-2013 07:24 PM                     I too had zero problems until some DCinema installs in 2012...the problem is...if you have it...it is VERY annoying since it is a show stopper and the CP650 is not the fastest processor to boot up. I have found that either you have the problem or you don't.  |  IP: Logged Peter Angelo Bua-ay Film Handler Posts: 8 From: Quezon city , Philippines Registered: Mar 2013 posted 05-02-2013 10:14 PM                     Robosound happen/experience only with server processor combination of Doremi IMB and dolby CP650 (based on my observation here, just don't know on other countries). We have the same set up but using different server and we never experienced the problem. Are the manufacturers aware on this?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-03-2013 06:29 AM                     Mine have been on Dolby servers.  |  IP: Logged Scott Christopher Film Handler Posts: 69 From: Adelaide, South Australia Registered: Apr 2001 posted 05-12-2013 08:09 AM                     I've had the same problem on 2 out of 3 screens here. All use Doremi servers and cp650's with cat.790's. Cinema 1 (which doesn't have the problem) has a rev.5 board - Cinemas 2 & 3 both have rev.4 boards and both have had problems (robosound and a couple of films have had 'popping/cracking' in the surround channel). I've never had to reboot to solve the robosound, just pressing the format button again clears it up.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-12-2013 06:26 PM                     Repressing the format button or switching off of the format and back sometimes works. But I would not bank on it. Since the CP650 clocks ALL channels off of the 1/2 pair...I was wondering if interrupting that line and re-establishing connection wouldn't clear the issue. -Steve  |  IP: Logged

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