my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Dolby Surround EX (Page 2)

This topic comprises 2 pages: 1  2

Author Topic: Dolby Surround EX Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 12-11-2003 03:08 AM                     I think we ventured into split surround Mag territory when Gordon brought up the subject of the CP200. -Aaron  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-11-2003 07:47 AM                     To bring it full circle...The CP-200, if you pay attention to the wonderful signal diagram in the back of the manual, always had the provision for the never released, Optical Stereo Surround. Steve  |  IP: Logged John McConnel Expert Film Handler Posts: 118 From: Okmulgee, OK USA Registered: Nov 2003 posted 12-11-2003 01:27 PM                        What was the configuration for the Optical Stereo Surround that was never released?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-11-2003 04:54 PM                     The movie TOMMY had split surrounds on the optical track using the QS matrix scheme The Lb and Rb vectors were summed for a standard 4:2:4 matrix yet on that film it was encoded with the LB and Rb like the mag prints and the first CP100 was configured for it  |  IP: Logged John McConnel Expert Film Handler Posts: 118 From: Okmulgee, OK USA Registered: Nov 2003 posted 12-11-2003 09:32 PM                        So what did the TOMMY optical sound track have? Stage Left Stage Right Left Surround Right Surround or what?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-11-2003 09:39 PM                     Left Centre Right P and Q  |  IP: Logged John McConnel Expert Film Handler Posts: 118 From: Okmulgee, OK USA Registered: Nov 2003 posted 12-12-2003 01:04 PM                        5 channels from optical? How is this done? Also, P and Q is unfamiliar terminology to me. What is it?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-12-2003 01:15 PM                     John said"5 channels from optical? How is this done? Also, P and Q is unfamiliar terminology to me. What is it?" I would sugest that you take the time to download and read in this order from the manuals on line Dolby CP100 Dolby SA5 Dolby CP200 After reading that most of your questions will be awnsered The twin surround outputs are possible because a matrix is in effect a circle of vectors and all one needs to do is extract the correct vector. If you look up the history that has been discussed on the site of the various methods of matrixing then the awnsers will become self evident  |  IP: Logged John McConnel Expert Film Handler Posts: 118 From: Okmulgee, OK USA Registered: Nov 2003 posted 12-12-2003 05:18 PM                        Thank you for the sources. I'll have to start reading. I've missed earlier discusions on the issue, but after getting into it recently, I started wondering if perhaps there could be sub-encoding in the encoded channels. The "circle of vectors" is a new expression to me. Initially, I was thinking "inside the box", which for me was four channels derivable from two optical tracks.  |  IP: Logged Bill Gabel Film God Posts: 3873 From: Technicolor / Postworks NY, USA Registered: Jan 2002 posted 12-12-2003 05:55 PM                     The sound format "Tommy" used was called Quintaphonic Sound . There was another decoder unit that you needed to use with the CP-100. My friend has the decoder from the Fox Wilshire Theatre engagement in Beverly Hills.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-12-2003 06:42 PM                     The quintaphonic decoder was for using DBX nr and Qs matrixed 4 track mag print The original CP100 in London installed for Tommy was fitted for 4 track mag with Dolby a on the print and also the option of SVA with split surround using the QS matrix The 116 surround card (used in the early surround adapters with teh cp50 and 100) took the left back and the right back and summed them for a surround output. Tommy did contain the Lb and Rb tracks which normally could be used as summed into a mono surround or standalone by iteself The big problem is if one does the vector diagram the centre back (monosurround) has the greatest distance from the left and right and centre channels than one drawn to the left and right back position since matrixs and logic steering was in its infancy the better the seperation you could get the less the time delay was critical for the haas effect to cancel out bleeding dialogue  |  IP: Logged John McConnel Expert Film Handler Posts: 118 From: Okmulgee, OK USA Registered: Nov 2003 posted 12-12-2003 08:59 PM                        Bill, I saw TOMMY at the Ziegfeld in New York, in Quintaphonic Sound, which was aurally spectacular. And a good movie, too. I presumed it was a 70mm 6-track print. But was it something else? When I played TOMMY in my own theatre in 4-track magnetic, the sound was also really good. But could a 5th channel have been derived?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-12-2003 09:07 PM                     All the mag prints had matrixed surrounds left (surround) back (P) and right (surround) back (q) are matrixed onto left and right tracks also it would have either DBX or Dolby NR on it  |  IP: Logged

All times are Central (GMT -6:00)

This topic comprises 2 pages: 1  2

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.