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Topic: Buying Dolby SR chips
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 10-11-2002 02:44 AM
I think Josh heard that the SR/NR cards were using home entertainment "S" chips. I don't know how true this is, but I think he wants the non-household chips if that is what they are.....or at least upgraded ones. I seriously doubt if they could be obtained from anywhere other than Dolby Labs. Josh, if they are solder-in chips, better make sure you have the right equipment to do the job if you are fortunate enough to "land" some. It might be cheaper to upgrade to state-of-the-art cards, and find a buyer for the old cards you have. I suggest you find out what your cards are worth on the fair market and act accordingly. I never looked inside the cards, so I really don't know what is in them. I don't have the equipment or facilities to work on them anyway. With the new and improved version of the chips, (if there are any) beware of other circuit changes that might have been necessary to make them work. Remember....Screwdriver getwitzen and gerfingerpolkin make for sparkin und spitzen...  I swiped the idea out of the PRO-35 manual. 
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 10-11-2002 11:51 AM
Frank said:
quote:
"Dolby is using consumer NR chips? In what? Not in its Cinema Processors, one would hope?!"
Frank, I am with you on this one. Apparently, he is not happy with the sound of them. If the modules sound like companders, maybe there is another problem with the CP-55 or he has some really old modules. What do you think? Maybe he wants them to build something himself. In that case, Gordon is on target.
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Ray Derrick
Master Film Handler
Posts: 310
From: Sydney, Australia
Registered: Sep 2001
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posted 10-12-2002 09:57 AM
Josh, the Dolby Cat222/SR card does indeed use the "Dolby S" chips, which were originally developed for home entertainment products. The S-type chip is an LSI analog chip which provides a single level of noise reduction. The 222/SR card uses two S-type chips in series (per channel) to try to emulate the SR process, which actually uses three levels of NR. The 222SR also makes use of some shortcuts to reduce circuit compexity which results in some audible abberations. AFAIK there is only one version of this chip - no upgrades. In contrast, the Cat280, Cat300 and Cat350 cards all use a near identical circuit that uses discrete ciruitry and which is "real" SR. IMHO the Dolby SR process is one of Ray Dolby's finest achievements. The Cat280 is a masterpiece of design. It is a real shame that the 222SR card was ever allowed to see the light of day.
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Ray Derrick
President/Chief Engineer
Panalogic Corporation Sydney, Australia
Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935
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