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Author Topic: How Dolby Digital and SDDS Works? Iben Jimenez Film Handler Posts: 27 From: Cayey, PR, US Registered: Mar 2006 posted 09-08-2007 07:54 PM                     I know that the analog sound works by detecting the modulation of light created by the varying-width soundtrack. But how does the Dolby soundtrack works? Does the small square with the Dolby logo has some information? What about the SDDS with the green bands?  |  IP: Logged Mark Strube Master Film Handler Posts: 322 From: Milwaukee, WI, United States Registered: Feb 2007 posted 09-09-2007 03:38 AM                        This should be a good start... http://en.wikipedia.org/wiki/Sdds http://en.wikipedia.org/wiki/Dolby_Digital#Applications_of_Dolby_Digital  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 09-09-2007 04:25 AM                     ..and the dolby symbol in the middle of the square acts like a center point (target) for the reader.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 09-09-2007 10:29 AM                        On Dolby's Digital, the four corners have significance since they serve as markers for the other information; just like a surveyor uses stakes to reference other boundaries. Louis  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 09-09-2007 11:02 AM                       quote: Monte L Fullmer and the dolby symbol in the middle of the square acts like a center point (target) for the reader. Huh? I've never seen a Dolby logo on my oscilloscope trace...  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 09-09-2007 11:17 AM                        Use a microscope, Tim, on the actual "square." Louis  |  IP: Logged Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 09-09-2007 12:31 PM                      |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 09-09-2007 01:26 PM                       I was ribbing Monte.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-09-2007 06:37 PM                     Tim, I get the DD insignia on my scopes display... Tektronix 465B.... I don't know what scope you're using but perhaps you need a wider bandwidth scope . Mark  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 09-09-2007 06:49 PM                  I did too Mark on my 465... Dunno what scope Tim is using but it's obviously not capable of aligning modern digital technology...  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-09-2007 07:56 PM                     Yep Phil! Thats exactly the same waveform that I see. Mark  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 09-09-2007 10:36 PM                        So what is the state of Sony's support of SDDS -- I seem to recall people here saying that they only have one guy doing tech support now? Are they still actually selling readers and processors? Or they doing a bye-bye like freaking Dolby and the DA20?  |  IP: Logged Patrick de Groot Expert Film Handler Posts: 161 From: Sprang-Capelle, Netherlands Registered: Apr 2001 posted 09-10-2007 02:27 AM                     quote: Iben Jimenez But how does the Dolby soundtrack works? Does the small square with the Dolby logo has some information? yes quote: Iben Jimenez What about the SDDS with the green bands? yes  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 09-10-2007 04:19 AM                     ...nice fenceline there...  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-10-2007 09:03 AM                     quote: So what is the state of Sony's support of SDDS -- We couldn't get any boards for DFP-3000's and have been waiting for sprockets for same since last November. We retired the 3000's with bad boards and are about to take delivery of custom stainless steel VKF sprockets made for us by LaVezzi to keep the remaining systems going. Since we have quite a few 8 channel houses we are aiming to keep those running as long as there are tracks on the film. So back to your question... Sony's present support is nearing zero! FWIW: Dolby still supports the DA-20 100%. Mark  |  IP: Logged

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