Also IBA technical reviews can be accessed here http://www.ntlpa.org.uk/memorabilia
Courtesy of the NTL Pension Association ! Regards Andrew ----Original message---- >From : st...@mail.telepac.pt Date : 05/01/17 - 16:27 (GMTST) To : sursound@music.vt.edu Subject : Re: [Sursound] The BBC & Quadrophony in 1973 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 _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
