Actually, there was a modification for this decoder that converted (I think) the 45J setting to UHJ
that was actually provided in the Integrex kits. Unfortunately, I'm not actually sure that it was
the 45J that changed - I didn't label it it the time (it was, um, obvious :-[
and it isn't clear in the paperwork I have from Integrex. - and I'm not convinced that it's a good
idea to power the box up to measure it...
Dave
On 22/08/2011 19:49, Eero Aro wrote:
Hi Richard and Gang
It is pretty difficult to see the encoding from the oscilloscope
picture as this is an acoustic SFM organ recording. There haven't been
any single point sources at any direction in the church, not to mention
center front.
If you have a center panned mono signal encoded into UHJ center
front, it will appear to have that certain phase difference between
L and R channels. You can see this with multitrack recordings
that have been mixed "Ambisonically".
There is a hardware solution to your problem:
The Wireless World decoder has settings for 45J and Matrix H.
UHJ didn't exist at that time. You just need to build this decoder.
The schematics are in the Motherlode:
http://decoy.iki.fi/dsound/ambisonic/motherlode/source/Surround%20Sound%20Decoders%20Pts%20567%20WW%201977.pdf
Please note that the article is missing the AB/MS stage. You need to pay
attention that this design assumes that M = R + L and S = R - L.
I once built the WW decoder but I don't have it anymore.
But if you just wish to hear the surround soundfield, I would say go
and decode with a UHJ decoder. You wouldn't hear the difference.
I don't, and I am just a sound designer. :-)
Peter's suggestion on converting the recording into G-Format is a good
one. Do that.
And... as Geoffrey said, don't bother to call Calrec. They'll just get confused.
It's great that you have found another missing Ambisonic recording.
It isn't listed in the Ambisonic Discography yet:
http://members.cox.net/surround/uhjdisc/ambindex.htm
On another point, I feel this record need archiving
Absolutely.
Funny that there isn't the name of the recording engineer. Usually these
LP's had.
Eero
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