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Topic: Cyan sound track??

Bernard Tonks
Jedi Master Film Handler

Posts: 619
From: Cranleigh, Surrey, England
Registered: Apr 2001

posted 04-22-2001 07:50 AM

I have a pair of RCA 9031 soundheads (Dolby SR) that need converting to red LED.

Grateful to anyone with first-hand knowledge of this equipment.

Thanks.

Bernard.

PS. Why the delay to cyan soundtrack anyway ?

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Steve Guttag
We forgot the crackers Gromit!!!

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

posted 04-22-2001 09:29 AM

>>"PS. Why the delay to cyan soundtrack anyway ?"<<

More to the point....Why bother with the cyan track?

It is an inferior track whose only benefits are for those that will not foot the bill of converting. It is noisier and higher in distortion.

What ever dubious environmental impact the silver redeveloped tracks pose is not an issue with the EPA.

Steve

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"Old projectionists never die, they just changeover!"

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Brad Allen
Jedi Master Film Handler

Posts: 688
From: Evansville, IN, USA
Registered: May 2000

posted 04-22-2001 01:29 PM

Is it possible to hook a reverse scan reader to a mono amp sound system? What tricks involved?
Thanks

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Josh Jones
Redhat

Posts: 1207
From: Plano, TX
Registered: Apr 2000

posted 04-22-2001 03:41 PM

Why would you want to hook it up to a mono system. one of the key benefits of the reverse scan is better stereo separation. I am running stereo out of the cells (direct scan)and into a bank of RCA 9362 optical preamps. I have NO noise reduction and it sounds nice enough for me.

Josh

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Gordon McLeod
Film God

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

posted 04-22-2001 03:53 PM

Even though stereo seperation is one of the pluses of reverse scan better high frequency response is also involved.
As well as the red light source which will be required for cyan tracks.
There appears to be even more intrest from the labs in speading up the conversion since for them it will save on the number of rejected prints due to applicator problems
To hook it up to a mono system just sum the two outputs with a pair of 600-1K resistors depending on the input impedance of the exisitng preamp

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 04-23-2001 07:41 AM

Dolby's website has information about cyan dye tracks:
http://www.dolby.com/tech/ci.os.0012.reddye.html
http://www.dolby.com/tech/ci.ot.0012.ScanRev.html

Here is the Kodak dyetrack webpage:
http://www.kodak.com/US/en/motion/support/dyetrack.shtml

The Ultra-Stereo Lab Technical Forum also has information:
http://www.uslinc.com/

A few dozen cyan dye track prints of "Getting Over It" ("Getting Over Alison") were recently sent by Miramax to theatres equipped with red LED readers, in a successful technology demonstration.

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John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

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Robert Golding
Film Handler

Posts: 65
From: Sutter, CA, USA
Registered: Jan 2001

posted 05-09-2001 02:26 AM

Hi all, a few weeks ago I stated that I was putting in a LED reverse reader with a Dolby sys. Sam Chavez came up with the units and installed everything and I must say that the improvement has been nothing short of AMAZING. Thanks Sam. For those of you who are waiting to see how it goes, get off it and install it. My old sys work great but the new one is such and improvement that I will even watch a movie that is soft as long as it has a good sound track. This weekend we start "driven" and this should really give the new sys a workout. Again the improvement with this new LED reader is so good that you should at least invest in this. Sam has made some improvements so changing out an LED is very easy. I say this as nobody yet knows how long they will last.
For all of you who think I'm nuts, someday you will see the light at the end of the tunnel. I have had nothing but positive coments from my patrons. My only regret is that I didn't do this a long time ago!

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 05-09-2001 08:01 AM

As Robert notes, there are many advantages to upgrading to a new reverse scan red LED reader, even for the current dye+silver analog tracks.

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Matthew Bailey
Master Film Handler

Posts: 461
From: Port Arthur,TX
Registered: Sep 2000

posted 05-09-2001 04:45 PM

Most of the trailers in my home collection
have magenta dye tracks. I run them through a
5 star stereo cell head and play them into
a Zenith FM/AM channger stereo through
an Ultra Stereo processor.

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 05-09-2001 10:00 PM

Matthew: Your recent trailers are likely magenta+silver tracks, or "high magenta". Older color analog tracks were magenta+cyan+silver. Both required the lab to apply a caustic viscous soundtrack developer to only the soundtrack area during processing to "redevelop" the silver needed to modulate the infrared energy in a white light (tungsten lamp) reader. The cyan dye tracks will not need this complex step in the processing:
http://www.kodak.com/US/en/motion/support/processing/h249/h2409_05.shtml

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Steve Guttag
We forgot the crackers Gromit!!!

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

posted 05-10-2001 12:30 PM

John,

Despite your claims, I am finding that in the field about 33% high-magenta the rest conventional.

As to redevelopment...I inquired with a local lab...apparantly, since the wide spread use of the polyester stocks (Kodak's was mentioned) the reject rate due to application related problems have dropped off to near 0. In fact, it is no longer thought about. Then again, this lab is known for quality over quantity...they NEVER contact print more than one stage at a time.

Steve

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"Old projectionists never die, they just changeover!"

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 05-10-2001 12:50 PM

Steve: I didn't "claim" anything. Matthew described his trailers as having "magenta dye tracks", so I indicated they were likely "high magenta" (magenta+silver).

Most labs do a good job when applicating soundtracks, but it is sometimes problematic on certain films, leading to skips or bleeding/blotches/splashes that stain the picture area.

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