They just specified slight changes in resistors and capacitors, not the formulae as such. In fact,
when I looked at the Integrex the other day, the label had fallen off and I'm no longer sure if it
was the 45J or the H position that was modified and the documentation that has survived is not clear
on the subject. I have a vague memory (_really_ vague after three and a half decades!) that I had to
phone them up and ask, so it maybe that it was never in the documentation.
Dave
On 26/01/2012 11:30, Richard wrote:
Don't suppose, by any chance, you'd still have details of the changes that were
made. Did they supply any information on the equation changes?
Richard
Paul has probably put his finger on it but unfortunately, unless one of the
remaining few people who were involved back then have the info, we would
probably have to find the original BBC tapes, since they tended to be
reasonably well documented. The information might be somewhere in Michael's
documentation, but I don't have access to that, and I don't think I have
the tapes. Although some did come to me through the John Hayes and Peter
Fellgett collections, I don't remember seeing any BBC ones other the
Charles + Di wedding ones. Of the people on this group, the one most likely
to know is Geoffrey Barton. Otherwise, does anyone know if Bob Harrison (of
the BBC, who seemed most closely involved with the Soundfield experiments
in the late 70's) is still around and contactable? He might know. On the
data for HJ, the November 1977 one seems most likely, as I seem to remember
getting a correction to my Integrex decoder to make matrix H into HJ - and
we bought the kit as soon as it became available.
Dave
On 25 January 2012 22:58, Paul Hodges<pwh-surro...@cassland.org> wrote:
> --On 25 January 2012 20:04 +0000 Richard<zoanne...@yahoo.co.uk> wrote:
>
> But was BBC ever using either of the formats officially?
>>
>
> And given that HJ was defined to include within its tolerance zones both H
> and 45J, they could by definition have simply continued using existing H
> equipment and labelling the results HJ.
>
> Paul
>
> --
> Paul Hodges
>
>
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