Can I have your email address as I suspect we can't attach files here
Richard
Yeah - do scan the cover, could be informative. NRDC were, indeed, very much
involved in the
introduction of UHJ/Ambisonics but there was a lot of experimentation going
on before the final
system was developed.
Dave
On 22/08/2011 16:16, Richard wrote:
> 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
> /*********************************************************************/
> /* Dave Malham http://music.york.ac.uk/staff/research/dave-malham/ */
> /* Music Research Centre */
> /* Department of Music "http://music.york.ac.uk/"; */
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> /* Heslington Fax 01904 432450 */
> /* York YO10 5DD */
> /* UK 'Ambisonics - Component Imaging for Audio' */
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