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WilliamVanner

Joined: 02/07/12
Posts: 6

Dolby SR lineup
#1002940 - 11/08/12 08:34 PM

Ok, this is fairly urgent, any help would be massively appreciated!

I need to check the proper way to lineup my Dolby cards for repro. My set up is- Otari MTR-100 with Otari Dolby cards, running through AD converters in PT. The tapes are Ampex 499's, recorded at 200nwb/m +4.

The process I've been using is to phase align with the test tones, then do my test tone lineup, at this stage with Dolby switched off. Still with Dolby off, I using the Otari machine's NR auto align to process whilst the Dolby tone is playing.

When I switch Dolby on and playback, these some quite audible high end humming when I listen!

Yes, yes, I know I'm a major Dolby noob, but I need to get these transfers done for a client and I want to make sure it's right!

Thanks for any help,
Billy

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zoosound
member

Joined: 13/12/02
Posts: 41

Re: Dolby SR lineup new

[Re: WilliamVanner]
#1002966 - 12/08/12 06:53 AM

Have you looked at this, section 4.3?

http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professi onal/151_363_8.Manual.pdf

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Hugh Robjohns
SOS Technical Editor

Joined: 25/07/03
Posts: 18392
Loc: Worcestershire

Re: Dolby SR lineup new

[Re: WilliamVanner]
#1002990 - 12/08/12 11:17 AM

Quote WilliamVanner:

The tapes are Ampex 499's, recorded at 200nwb/m +4.

That's 320nWb/m near as makes no difference

... although it is irrelevant as far as the Dolby line-up is concerned.

Quote:

The process I've been using is to phase align with the test tones

good start...

Quote:

then do my test tone lineup, at this stage with Dolby switched off.

Pointless, because the Dolby system will change the levels, at least at the frequency extremes. if not at 1kHz (depending on the initial calibration).

Quote:

Still with Dolby off, I using the Otari machine's NR auto align to process whilst the Dolby tone is playing.

I'm not familiar with the Otari auto-align process -- I've only ever used separate Dolby codecs and aligned them manually -- but I'm struggling to see how the system can align the Dolby calibration points when the system is switched off!

Quote:

When I switch Dolby on and playback, these some quite audible high end humming when I listen!

I don't think I'm surprised!

Dolby have a wealth of information on their NR systems on their websites, including full alignment proesses for their own gear. That may help with your situation... but I suggest the best way forward would be to find the Otari handbook and follow the relevant instructions for the auto-align process.

hugh

--------------------
Technical Editor, Sound On Sound

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