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Topic: Optimizing the dolby error rate

Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99

posted 08-27-2002 02:06 PM

quote:
"The processor _Shouldn't_ make a difference. I have had "0" on DA-10, DA-20, CP-500 and CP-650s. If any of those may be fudging things a bit, I'd say it is the CP-650."

I am shocked you didn't know that the processor does or at least *can* make a difference, Steve. A couple of years back we tried this very test. We took a DA20 into an booth with a CP500 and ran a trailer twice in a row, once with the reader hooked into each unit. The CP500 ran 2 points higher than the DA20 did. Granted this wasn't *too* scientific of a test, as we did not get a pool of CP500s and DA20s to see if this was a repeatable fact, but it certainly proved that the processor CAN have something to do with the readings.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 08-27-2002 04:08 PM

First off...I said shouldn't...second, where as the Dolby Digital sections of the DA-20 and CP-500 are identical (same cards), the difference can probably be attributed to the software revision running in each.

Steve

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"Old projectionists never die, they just changeover!"

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Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99

posted 08-27-2002 04:40 PM

It's ok Steve, I'm just teasing you.

Anyway, now you have something to do research on.

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Darren Briggs
Master Film Handler

Posts: 371
From: York, UK
Registered: Dec 2001

posted 08-27-2002 05:51 PM

Well its not uncommon for an average print to run at 1/2 on my Cinemeccanica basement readers with a DA-20.
Tested a BACP penthoude lately and that gave great results on most films which ran on it.
I think its down to the Tech who set the thing up. 2001 35mm prints ran at 0/1 all the way through so the print does make the most difference in my opinion, as this was one of 2 prints made inthe u.k.

Darren

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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002

posted 08-27-2002 09:14 PM

I'm just installing brand new CP650s with 701 heads. The auditoria are still being fed from the CP45s. All we are doing at this stage is testing the connection (we are awaiting those crossovers I mentioned in another thread).

Anyway, I'm getting a 3 for the error rate. Is this okay...for brand new gear?

Should a "fresh-out-of-the-box" 701 require adjustment/optimization?

~Manny.

"I know he can get the job...but can he DO the job!!??"
-- Mr. Waturi in Joe Versus The Volcano

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 08-27-2002 10:09 PM

Generally, the Cat. 701 is "ready" out of the box. The feature you are playing will have a great affect on the tracking quality.

Just curious, which crossovers did you end up going with?

Steve

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"Old projectionists never die, they just changeover!"

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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002

posted 08-31-2002 06:35 PM

I went with the Smart crossovers.

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Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 08-31-2002 07:15 PM

Good Smart decision I have been very happy with them

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Steve Kraus
Film God

Posts: 4094
From: Chicago, IL, USA
Registered: May 2000

posted 08-31-2002 07:36 PM

The other Steve said:
>where as the Dolby Digital sections of the DA-20 and CP-500 are identical (same
>cards), the difference can probably be attributed to the software revision running in each.

Once you're in the digital domain differences should ascribe to the software but I wonder if perhaps individual characteristics of the Cat.670 card which is digitizing the video in the first place can also play a role. If both units were running the same software revision then it would be interesting to see the results of swapping the Cat.670's. This is pure conjecture of course.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 09-01-2002 02:18 AM

Yeah, Gordon but you have been happy with all SMART products!

Steve

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"Old projectionists never die, they just changeover!"

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