Thanks for the reply. this gets more and more interesting, doesn't it. I
thought the NRDC were responsible for the introduction of UHJ/Ambisonics, but
then I could be wrong. Am very hazy about what happened when I'm afraid.
I'd really like to get to the bottom of this, really because I'd like to hear
it decoded.
If you'd like I can scan the relevant parts of the cover for you, it does state
'Ambisonics' a couple of times. But then, your mention of BMX could possibly
point the way.
Still haven't been able to contact Calrec who produced the album.
Now, if it is BMX then it should be decodable in the same way I decode QS (and
SQ) as QS was based on RM
Richard
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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