Nothing like writing a quickie while I waited for the bus.
Correct second option will follow tonight. Sorry
Fat fingers and tiny keys
> On 4 Oct 2018, at 18:57, Borja Marcos [naturerecordis=
ts] <> wrote:
>
>
>> On 4 Oct 2018, at 16:10, Duncan Whitley [nature=
recordists] <> wrote:
>>
>>
>> Hi all
>>
>> Wondering if anyone with mid-side knowledge can help me out on this one.=
I made some recordings last night and in the dark mistakenly plugged the S=
into the left-channel of my recorder, and the M into the right. Usually th=
is wouldn=92t be problem for me to rectify as I tend to record in MS on dis=
crete mono channels and decode later - however, on this occasion I decoded =
to XY stereo inside the matrix box of the mic.
>>
>
> Fortunately MS encoding/decoding is a linear, reversible operation.
>
> L =3D (M + S) / 2
>
> R =3D (M - S) / 2
>
> If you have exchanged M and S you have two options.
>
> 1) Reverse the phase of the R you decoded from the exchanged ; and S
>
> 2) You can undo the process by getting the resultant XY decoding back to =
MS. After doing that, exchange M and S and decode again
>
> Something like:
>
> M=97-\. /=97=97-\
> Convert to XY =97-- Convert to XY again
> S =97-/. \=97=97/
>
>
>>
>> Is it possible to recover the original M and S channels from the XY ster=
eo decoded recordings? My intuition says =93no=94, but wondered if anyone h=
ad any knowledge on this.
>>
>> It=92s easy enough to derive the M and S from the XY stereo when the cha=
nnels have been decoded to stereo correctly in the 1st place, but I=92m not=
sure in this case if it still works.
>>
>> Thoughts?
>>
>> Duncan
>>
>
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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