Hi Richard,
Oddly enough, I don't actually remember this - odd, in that I was already interested in
Ambisonics at this point (and was completely convince by MAG's Soundfield mic presentation at the
AES in London the next year). It isn't mentioned in either FELLGETT, P.B. 'Ambisonic Reproduction of
Directionality in Surround Sound Systems' NATURE, Vol 252 December 13, 1974 pp 534 - 538. or
Michael Gerzon, 'Surround Sound Psychoacoustics', Wireless World, vol. 80, pp. 483-486 (1974 Dec.).
However, it _does_ mention in the latter article that "The National Research and Development
Corporation has recently bee developing, with the author, a two-channel decoding apparatus for BMX
or RM-encoded sounds, too feed four loudspeakers ...." so if it was published (as well as recorded)
around 1974, I'm afraid that there is yet another possibility - it might BMX or RM :-) I would
think that the only people around who are really likely to know for certain are Geoffrey Barton,
Peter Carbines or Peter Craven - pretty well everyone else has gone...
Dave Malham (just back from holiday - so couldn't respond earlier)
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
--
These are my own views and may or may not be shared by my employer
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