Sorry to come late to this party, I've been out of the country.

I don't know the Calrec stuff at all well. There's Derrick Cantrell's Organ Recital at Hepstonall Parish Church, which I think was the first; catalogue number AS1 I think.

If it's from 1974, then it could well be 45J. When I was at EMI (1976) we were still using 45J - I remember producing badges that said "45J - The Best Sounds Surround" and that would have been 1976-ish.

You should be able to decode with any available UHJ decoder to suit your speaker array. Worst case I think you'll find the soundstage rotated a few degrees.

By G-format, Peter C is talking about decoding to a square 4-speaker array, the default for creating a conventional multichannel disc from Ambisonic content without requiring the listener to have a decoder (ie you decode it for them to a configuration that will work for most real surround listening environments), see:
http://ambisonic.net/pdf/ambisonics_around.pdf. (PDF, 950K)

Peter also mentions the Meridian software decoder, which is not available. However there are plenty of software decoders available for download.

Hope this helps,

Best,
-_Richard Elen

On 09/08/2011 05:49, Richard wrote:
Hi all

I have a couple of questions that I suspect may be hard to answer, and that is 
regarding the encoding of a LP I have.

I bought this 'Ambisonic' LP in 1977, but it has a recording date of 25th March 
1974. It is on the 'Calrec Audio Ltd' label and clearly states the involvement 
of the N.R.D.C

Now the questions I have are:

1, If this is truly an early Ambisonic recording, could it be an early version 
of UHJ where Y= (0.3225 +- 0.00855j) instead of what is now used Y= (0.3277)

2, Would there be anyway of checking?

3, If it is, is it possible to accurately decode it?


Richard


I believe.... because nothing's impossible

Dreaming-Spires: My home for people with 4 ears
http://the-quad-blog.blogspot.com/
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