To:
Sent: Tuesday, March 13, 2007 4:58 AM
Subject: Re: [Nature Recordists] X-Y -> M-S & Perfect Reversals
At 8:48 PM +0000 3/12/07, John Lundsten wrote:
>JL- I recon (not 100% sure) if you set the decode with the same gain on
>both M&S, unity say. Then boosted / attenuated as needed the L&R output
>channels by the inverse of the amount used on the En-Code, you may (poss)
>get back where you started.
Rob Danielson Replied
That's what I tried on test #4. Test #3 also without the +6dB gain.
http://www.uwm.edu/~type/audio-reports/M-SDecodeAccuracyTest/+matrix_2ndPlu=
gSettingsUndoFirstNoGain/
JL- I think there IS a difference
I suggested "you set the decode with the same gain on both M&S"
Rather than the offset gains you used
The thinking is:--
The Encode will have the quantity of both M&S one decided in setting the
faders -- An important point to realise is the quantity so defined will go=
in equal amount to BOTH outputs (for M these will be in phase with each) fo=
r
S IDENTICAL QUANTITIES will again be sent but with a polarity inverse on th=
e
right.
So if you were say to just add/sum the encoded signals the S signal will be=
at what ever level you though suitable But with equal amount sent to both
outputs) and it will cancel out But cancellation will only will happen for=
signals that are in antiphase and are the same level.
best regards
John
|