Avid Pro Audio Community

Avid Pro Audio Community

How to Join & Post  •  Community Terms of Use  •  Help Us Help You

Knowledge Base Search  •  Community Search  •  Learn & Support


Avid Home Page

Go Back   Avid Pro Audio Community > Pro Tools Post Production > Post - Surround - Video

Reply
 
Thread Tools Search this Thread Display Modes
  #291  
Old 04-11-2015, 04:06 AM
Cheesehead Cheesehead is offline
Member
 
Join Date: Sep 2006
Location: London
Posts: 965
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.
__________________
Mac Pro 7,1 16 core, OSX 12.7.3, HD-Native TB, Trinnov MC, MTRX Studio, 2xRME ADA-4, Sync HD, AJA IO XT, Avid Dock, Avid S1, PT Control, Soundflow, PT 2023.12
Reply With Quote
  #292  
Old 04-11-2015, 07:39 AM
joachim's Avatar
joachim joachim is offline
Member
 
Join Date: Dec 2010
Location: Germany, München
Posts: 1,687
Default Re: NEW UPDATED Room Calibration for Film and TV Post

From some manual I copied this one, see attachment.
Attached Images
File Type: jpg Dolby Pot.jpg (20.9 KB, 0 views)
__________________
PT 11.3.2 HD , RME Fireface 800 , Genelec 5.1 ,
Win7 64bit Professional , i7 3930 Hexcore , 48GB Ram , SSD System + SSD PT Session/Audio + SSD Video (all Samsung 840 Evo) + Spinner 1TB Data , 2x Radeon HD 5450 \\ SD 633 Femto MKH8060 MKH8070 MKH30/MKH40 DPA4060
Reply With Quote
  #293  
Old 04-11-2015, 01:08 PM
Cheesehead Cheesehead is offline
Member
 
Join Date: Sep 2006
Location: London
Posts: 965
Default Re: NEW UPDATED Room Calibration for Film and TV Post

Thanks Joachim,

I owe you a virtual beer.

Martin
__________________
Mac Pro 7,1 16 core, OSX 12.7.3, HD-Native TB, Trinnov MC, MTRX Studio, 2xRME ADA-4, Sync HD, AJA IO XT, Avid Dock, Avid S1, PT Control, Soundflow, PT 2023.12
Reply With Quote
  #294  
Old 04-11-2015, 01:19 PM
joachim's Avatar
joachim joachim is offline
Member
 
Join Date: Dec 2010
Location: Germany, München
Posts: 1,687
Default Re: NEW UPDATED Room Calibration for Film and TV Post

Gulp, gulp, gulp, .... ahhhhh.
__________________
PT 11.3.2 HD , RME Fireface 800 , Genelec 5.1 ,
Win7 64bit Professional , i7 3930 Hexcore , 48GB Ram , SSD System + SSD PT Session/Audio + SSD Video (all Samsung 840 Evo) + Spinner 1TB Data , 2x Radeon HD 5450 \\ SD 633 Femto MKH8060 MKH8070 MKH30/MKH40 DPA4060
Reply With Quote
  #295  
Old 02-24-2016, 09:10 PM
SyneWave SyneWave is offline
Member
 
Join Date: Feb 2016
Location: USA
Posts: 4
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 !
Reply With Quote
  #296  
Old 12-11-2020, 05:20 PM
CCash CCash is offline
Member
 
Join Date: Dec 1999
Location: Los Angeles
Posts: 1,423
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
Reply With Quote
  #297  
Old 12-12-2020, 05:13 PM
dr sound's Avatar
dr sound dr sound is offline
Member
 
Join Date: Jul 2002
Location: Burbank, CA
Posts: 2,220
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.
__________________
Marti D. Humphrey CAS
aka dr.sound
www.thedubstage.com
IMDB http://www.imdb.com/name/nm0401937/
Like everything in life, there are no guarantees just opportunities.
Reply With Quote
  #298  
Old 04-16-2021, 07:58 PM
aholicsound aholicsound is offline
Member
 
Join Date: Apr 2021
Location: Los Angeles, CA
Posts: 17
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
Reply With Quote
  #299  
Old 04-16-2021, 09:12 PM
BScout BScout is offline
Member
 
Join Date: Mar 2007
Location: Los Angeles, CA
Posts: 4,122
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)
__________________
Pro Tools Ult 2024.3, HDX 2, MTRX/SPQ, RME BBF Pro + MADIface ProS1 x 2, Fire HD10 + Max11, Dock, iPad Air5 Mac Mini 14,12, 12 core, macOS 13.6.5RAM 32GB, SSD 4TB, GPU 19 coreQNAP TVS-872XT 148TB TB3
Reply With Quote
  #300  
Old 08-17-2022, 07:50 AM
DJEJPRO DJEJPRO is offline
Member
 
Join Date: May 2015
Location: Dallas
Posts: 26
Default Re: NEW UPDATED Room Calibration for Film and TV Post

In relation to the last few posts on this thread, I've noticed something about the frequency response of the signal generator in pro tools.

The attached image shows both on SPAN (set to AVG, 1/6 octave smoothing, Slope 3.00; to get a 'flat' visual).

Basically, the Dolby Pink looks pretty flat across the whole spectrum. The Pro Tools Pink varies up to 2db at around 60hz and 1.7khz

The SPAN plugin was duplicated with all the same settings, so this is a subjective hard comparison between the Pro Tools signal generator and the Dolby Pink audio file.

I've read how the PT signal gen plugin isn't desired for various reasons, but don't recall anything about the frequency response.

Quote:
Originally Posted by BScout View Post
Pro Tools pink noise is trash.
Use the Dolby -- the crest factor is important.
Is this anomaly I'm seeing crest factor related?

With an RTA..wouldn't these frequency anomalies cause some problems???

Is this an intentional freq. resp for PT Pink? Or should it have looked like the Dolby Pink freq. response? (SPAN plugin: PT on the left, Dolby on the right)
Attached Images
File Type: jpg PT_Pink_VS_DOLBY_Pink.jpg (33.5 KB, 0 views)
File Type: jpg TracksView.jpg (41.4 KB, 0 views)

Last edited by DJEJPRO; 08-17-2022 at 08:05 AM. Reason: edited
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Room Calibration - ATSC Standards - Help mikevarela Post - Surround - Video 20 08-29-2013 09:26 AM
D-Control output calibration for film... Pete@twenty7pix ICON & C|24 2 02-28-2011 10:10 PM
Meters for room calibration idris Post - Surround - Video 3 09-23-2010 05:27 PM
Calibration in a small room... joeyk Post - Surround - Video 3 05-08-2006 10:02 PM
Room Calibration and Levels for LE Starcrash Post - Surround - Video 8 08-03-2005 10:40 AM


All times are GMT -7. The time now is 11:49 PM.


Powered by: vBulletin, Copyright ©2000 - 2008, Jelsoft Enterprises Limited. Forum Hosted By: URLJet.com