"Dave Plowman (News)" wrote in message
...
In article ,
John J Armstrong wrote:
Or for that matter their late 50's stereo tests on a Saturday morning
using BBC TV sound and BBC Third Programme as the two channels. I
remember my dad moving the (very large) radiogram into the correct
position......and my mother's horror!

I do indeed remember them. And given how important accurate phase is
across the full frequency range for decent stereo I wonder why they even
bothered.

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*People want trepanners like they want a hole in the head*

Dave Plowman London SW
To e-mail, change noise into sound.

I remember the two FM experiments of the 70s, but not the earlier radio/TV
ones.

As to why bother, I suppose it was probably enthusiasm over ignorance. As a
school-boy, I experimented with stereo using very unmatched channels, and
was nevertheless fascinated by the results. I can imagine BBC engineers
wanting to see what was possible with what they had. I would further assume
that coming out of these experiments was the knowledge that phase matters.
Having read some of Blumlein's papers many years ago, I don't recall that
there was a lot of emphasis on the importance of phase, but a great deal on
amplitude differences and arrival times at the ear.

S.
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