How do I Encode to Mid - Side?

robwithhair · 2nd February 2009

Hi there guys,

Got an idea for a piece of hardware the other night while I was trying to get to sleep. Stayed up all night with stuff going around in my head so please help me get a good nights sleep!

I know how to decode a M-S signal from say a mic. But just so I don't drive myself crazy and get some sleep tonight. Would you remind me of how to Encode a M-S signal from a L-R signal.

From my nights insomnia I thought that S=L-R and M=L+R. I see how summing the channels will give the mid but that will still give me some side in the mid. The side seems quite obvious but the mid is confusing me. Probably because I've not hand any sleep.

Anyway, if i encode mid side like this and then decode using the usual method will this give me exactly the same signal?

Oooh, my brain hurts.

Thanks for your help

Robert

Matt Syson · 2nd February 2009

Hi
You can already buy them!
Side is L-R and if it is done with sufficient fidelity then it should all come out in the wash.
Google 'M+S recording or whatever and some articles should pop up.
Good luck
Matt S

_Morph_ · 3rd February 2009

Quote:

Originally Posted by robwithhair

Anyway, if i encode mid side like this and then decode using the usual method will this give me exactly the same signal?

Yes.

tINY · 4th February 2009

Copy the R, flip the phase on the copy and call it "-R".

Sum L and R to make M.

Sum L and "-R" to make S.

And then, for $hits and giggles, you can reverse it by copying S and flipping the phase to get "-S"

L is the sum of M and S

R is the sum of M and "-S"

This is easy in the box....

-tINY

2nd February 2009	#1
robwithhair Gear interested Join Date: Sep 2006 Posts: 11 Thread Starter	How do I Encode to Mid - Side? Hi there guys, Got an idea for a piece of hardware the other night while I was trying to get to sleep. Stayed up all night with stuff going around in my head so please help me get a good nights sleep! I know how to decode a M-S signal from say a mic. But just so I don't drive myself crazy and get some sleep tonight. Would you remind me of how to Encode a M-S signal from a L-R signal. From my nights insomnia I thought that S=L-R and M=L+R. I see how summing the channels will give the mid but that will still give me some side in the mid. The side seems quite obvious but the mid is confusing me. Probably because I've not hand any sleep. Anyway, if i encode mid side like this and then decode using the usual method will this give me exactly the same signal? Oooh, my brain hurts. Thanks for your help Robert __________________ robwithhair http://www.fortressstudios.co.uk

2nd February 2009	#2
Matt Syson Lives for gear Join Date: Sep 2004 Location: UK Posts: 4,567	Hi You can already buy them! Side is L-R and if it is done with sufficient fidelity then it should all come out in the wash. Google 'M+S recording or whatever and some articles should pop up. Good luck Matt S __________________ Matt S www.mseaudio.co.uk

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4th February 2009	#4
tINY Gear Guru Join Date: Jul 2004 Location: Orygun Posts: 10,206	Copy the R, flip the phase on the copy and call it "-R". Sum L and R to make M. Sum L and "-R" to make S. And then, for $hits and giggles, you can reverse it by copying S and flipping the phase to get "-S" L is the sum of M and S R is the sum of M and "-S" This is easy in the box.... -tINY