This is in reference specifically to MUtility, but it may be of relevance in other Melda plug-ins.
The Coder box in the lower left of the UI has the following options:
Left+Right -> Mono+Stereo
Mono+Stereo -> Left+Right
Left+Right -> Mono
Left+Right -> Stereo
Left+Right -> Left
Left+Right -> Right
First, can I assume Mono and Stereo means Mid and Side? I can't think of anything else that makes sense.
At what point is the requested Coder transformation applied? To the signal at input or at output?
Is there any difference between the first two options as far as internal computations? There's one way to convert between L/R and M/S that uses the same formulas in both directions. So, are those choices there just for clarity?
Finally, is the Coder function completely independent of the Mode (that button in the upper right that defaults to L+R)? I would think it would be but clarification would be appreciated.
Thanks.
Mid/Side Questions
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- KVRist
- 32 posts since 4 Apr, 2015
L+R-R=Mid
L+R-L=Side
If i recall correctly, although almost sure that's right
L+R-L=Side
If i recall correctly, although almost sure that's right
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- KVRAF
- Topic Starter
- 1759 posts since 11 Nov, 2009 from Northern CA
Not quite correct. Here's a conversion formula that will convert M/S to L/R or vice versa. It's good in both directions:AudioTraveler wrote:L+R-R=Mid
L+R-L=Side
If i recall correctly, although almost sure that's right
new-ch0 = (ch0 + ch1) - 3dB
new-ch1 = (ch0 - ch1) - 3dB
or
new-ch0 = (ch0 + ch1) * 0.7079
new-ch1 = (ch0 - ch1) * 0.7079
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- KVRAF
- Topic Starter
- 1759 posts since 11 Nov, 2009 from Northern CA
OK, answering my own questions based on some tests I put together ...
The Coder "Mono" and "Stereo" terms seem to be synonymous with "Mid" and "Side".
The Coder transform is done on the output signal (pretty much as expected).
The LR<->MS transform is not the symmetrical one (mentioned in previous post).
As best I can tell, Mode and Coder operate completely independently.
The Coder "Mono" and "Stereo" terms seem to be synonymous with "Mid" and "Side".
The Coder transform is done on the output signal (pretty much as expected).
The LR<->MS transform is not the symmetrical one (mentioned in previous post).
As best I can tell, Mode and Coder operate completely independently.
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MeldaProduction MeldaProduction https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=176122 - KVRAF
- 14339 posts since 15 Mar, 2008 from Czech republic
Ok, so any questions left?
Anyways from your last 2 posts: it's actually * 0.5, not 0.7079 (hence more like 6dB). But you could think the way you are if you'd apply additional -3dB gain when converting back to LR. Here the gain is applied just once, when converting to M/S.
Anyways from your last 2 posts: it's actually * 0.5, not 0.7079 (hence more like 6dB). But you could think the way you are if you'd apply additional -3dB gain when converting back to LR. Here the gain is applied just once, when converting to M/S.
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- KVRAF
- Topic Starter
- 1759 posts since 11 Nov, 2009 from Northern CA
Yep, I figured that out the approach you are using with a simple test. It was clear you aren't using the symmetrical conversion formulas.MeldaProduction wrote:Ok, so any questions left?
Anyways from your last 2 posts: it's actually * 0.5, not 0.7079 (hence more like 6dB). But you could think the way you are if you'd apply additional -3dB gain when converting back to LR. Here the gain is applied just once, when converting to M/S.
There are still other variations on this. The formula pairs all work fine as long as you are careful to match the LR-to-MS formula with the correct MS-to-LR formula. I kind of like the symmetrical formula because you can't screw it up. Whatever you start with, you are guaranteed to get a correct conversion to the other form.