Alan Varty wrote:
Hello Eero.
I cannot remember which issues contained the schematics for the
Matrix-H only variomatrix decoder, sorry.
Later, there were some simple mods to change from H to HJ.
Then, along came the Integrex linear decoder with shelf filters and
multi-system selection buttons, which I also built.
Later still, the IBA carried out some experimental 2.5/3 channel
surround sound broadcasts which were compatible with
existing FM stereo receivers. In relation to this there is a proposed
new type of demultiplexer for improved FM stereo or 3-channel
broadcasts by J. Halliday. This can be found in IBA Technical Review
No. 17 of March 1982.
(mysterious) I < believe > that this unknown "experimental 2.5/3
channel Halliday format" was sometimes also called <U>HJ.
This information is classified...
(doc. "IBA Technical Review No. < 17 >" of March 1982 can be consulted
at Her Majesty's GCHQ. You will need some special permission to do so
... O:-) )
Best,
Stefan
Many thanks indeed Eero.
You are welcome.
Actually, is the WW article with the practical schematics this one
mentioned
in the refrences:
Heller, D: Surround Sound Decoders Pts 3 and 4. QS Variomatrix Wireless
World 82
(1488-9) pp. 57-59 August, and pp. 53-56, September 1976 ?
I have never seen that particular article? Anyone with a copy?
Or, was there ever a practical schematic released?
The basic H-Matrix decoder schematics were earlier released in a
Wireless World
article. That was actually a multi-format decoder.
Eero
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