Dolby Atmos & Correlated Audio

Mix engineer Dave Stagl looks at decorrelation in Dolby Atmos and when it happens.
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SOCIAL MEDIA
/ fohdave1
/ goingto11
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00:00 - Start
00:28 - What is Correlated Audio?
02:01 - Why Correlation Matters?
03:18 - Correlated Audio and the Atmos Binaural
04:55 - Decorrelation in Speakers?
08:02 - When Does De-Correlation Take Place?
10:13 - A Note About Size
11:34 - Wrap-Up

[@JamesArthurHurley]

8:33 I feel like ANY amount of "Size" as an object yields the SAME decorrelation amount.

[@ArielQuesada]

I love your videos David

[@goingto11]

Thanks!

[@JamesArthurHurley]

So generally speaking, my take away from this is, DON'T use size lol or don't use size with objects at least... I never liked it in the resultant mix. It feels great when you are isolating things, sometimes, but when you add it back into a mix things get lost. To me anyway

[@goingto11]

I probably would only use size with an object. I think there's probably a case out there for using size, but I'm still figuring that out. ;)

[@fkg360]

Man, you rock. I really enjoy your videos and I think Atmos is a blessing and sometimes a burden. But sticking to the wall is very usefull but also a pity as I really would like to use objects more. Anyway, keep going. To 1️⃣1️⃣

[@goingto11]

@@fkg360 I'm glad you're enjoying the videos.
I think you can still use objects and stick to the wall. I do that for some autopanning stuff all the time. When I was at an Atmos masterclass with Bob Clearmountain a week or so ago, he brought up a good point in regards to the walls: basically, he said he felt like when you bring stuff off the walls into the room, the mix starts to collapse to mono and you lose immersion.

[@freddiespellsmusic]

👌🏾

[@thisiswhereiwatch]

Never liked the sound of the size function.

[@atellsoundtheory8774]

I'm afraid you're not using your terminology correctly. What you are seeing in the correlation matrix is not decorrelation but anticorrelation. Anticorrelation is correlation with a negative correlation coefficient. A decorrelating process moves signal towards an uncorrelated state, where the correlation coefficient is close to zero. Uncorrelated signals don't have any phase issues when summed, by definition. Anticorrelated signals mostly cancel when summed, correlated signals mostly amplify when summed.

[@keywestjimmy]

I agree. Have you heard Atmos over speakers? Do you think Atmos is properly propagating uncorrelated audio?