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  #291  
Old 04-11-2015, 04:06 AM
Cheesehead Cheesehead is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

I know the scale relationship of db to Dolby Cinema Processor settings from Danijels excellent 'cheat sheet', but it only goes up to 7 being 85db.

Does anyone know how the db volume increases after 7 on the DCP?

What is 7.5 in db for instance?

Its clearly not linear up to 7.

Thanks all.
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  #292  
Old 04-11-2015, 07:39 AM
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joachim joachim is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

From some manual I copied this one, see attachment.
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File Type: jpg Dolby Pot.jpg (20.9 KB, 0 views)
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  #293  
Old 04-11-2015, 01:08 PM
Cheesehead Cheesehead is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

Thanks Joachim,

I owe you a virtual beer.

Martin
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  #294  
Old 04-11-2015, 01:19 PM
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

Gulp, gulp, gulp, .... ahhhhh.
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  #295  
Old 02-24-2016, 09:10 PM
SyneWave SyneWave is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

Hi guys,

thank you for this great thread with lots of useful info !

Got a quick question, I'm on a simple stereo speaker setup in a small room. Calibrated both speakers to 77 dB SPL using the Dolby pink noise provided at the beginning of this thread @ -20 dBFS, played back in PT.

My ART SPL-8810 SPL meter seems to be a bit unstable, so I am also using a miniDSP UMIK-1 USB measurement mic which in combination with sensitivity data and REW can be used as a pretty accurate SPL meter.

Results match the physical SPL meter, but the measurement mic is more stable in the readings.

My question is whether it is normal that the SPL values have a range of 1 - 1.5 dB difference when playing back the Dolby pink noise ?

So when calibrating to a specific SPL value, what value would you choose to decide what level the signal is at (since the SPL values keep moving around) ? Are you rounding up or down ?

In my first calibration I ended up using the average SPL option in REW, which averages the SPL values over time and gives me a fixed number... do you think that is okay ?

Thank you for your help !
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  #296  
Old 12-11-2020, 05:20 PM
CCash CCash is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

Here's an update for the very first link in the first post (for the Dolby DP564 Multichannel Audio Decoder User’s Manual):

https://developer.dolby.com/globalas...ers-manual.pdf
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  #297  
Old 12-12-2020, 05:13 PM
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dr sound dr sound is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

NEW UPDATE FOR DOLBY PINK NOISE:
Click on Original "New Updated Room Calibration for Film and TV Post"
Post #1 .
There is a NEW Dropbox Link for the Dolby Pink Noise.
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  #298  
Old 04-16-2021, 07:58 PM
aholicsound aholicsound is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

Forgive me if this has been discussed here;

But what do we make of the discrepancy between the Dolby DMU Pink Noise and Pro Tools built in sig-gen? Dolby's is quite a bit hotter and fluctuates more.

They've recommended I use theirs but I can't shake the feeling my system may be over calibrated. I'd love some peace of mind on this!! Would hate to have one of my mixes play low.


Thanks all
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  #299  
Old 04-16-2021, 09:12 PM
BScout BScout is offline
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Default Re: NEW UPDATED Room Calibration for Film and TV Post

Quote:
Originally Posted by aholicsound View Post
Forgive me if this has been discussed here;

But what do we make of the discrepancy between the Dolby DMU Pink Noise and Pro Tools built in sig-gen? Dolby's is quite a bit hotter and fluctuates more.

They've recommended I use theirs but I can't shake the feeling my system may be over calibrated. I'd love some peace of mind on this!! Would hate to have one of my mixes play low.


Thanks all
Pro Tools pink noise is trash.
Use the Dolby -- the crest factor is important.
In the end the "next room" will be calibrated by the Dolby tones. Not Pro Tools. The Pro Tools is only ever good to do some simple -- relative -- levels quickly. (And don't use the DSP mode of the sig generator plugin; there are phase issues that screw up the sound; use native)
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