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Dragged back to mathematical work….Screaming

2 Feb

After adapting the EV-4 decoding process to include H.O.P. i felt that i’d had enough of working on these matrix systems and decided that enough was enough.

That was until a conversation with a pal over the pond with regards the BBC’s second quad matrix system got me trying out its possible compatibility with the early Ambisonic system 45j, which actually proved not to be the case.

The problem with stating it’s not compatible is you need to prove it, so i created a basic decode process to check, which actually ended up becoming a full-blown process.

Like it’s slightly older brother, Matrix HJ has proven to be the nightmare it promised to be, but it’s finally done, and it includes H.O.P. That means there will be no upgraded version in the future as it’s the first decode process to be the best decode from the start.

To ask a question before it’s asked, what of Matrix H and any chance of an upgraded process?

The answer is a tentative ‘yes’.

Recently some information has been received that the Matrix H test broadcasts were complicated by the encode process being altered during the test phase, which was actually only until September 1977, which was when work on Matrix H was stopped in favour of its replacment, Matrix HJ. Although the difference is small, it’s enough to complicate the process of accurately decoding it, therefore needing two different versions of the process depending on which of the encoders was used on what material.

To further complicate matters, there is no list of which was encoded by which version, so it’s going to mean a method of deciding which version of Matrix H was used needs to be created.

Another issue that has arisen with both H & HJ is that most of the available recordings are ‘off air’, normally done on cassette decks. This further complicates things as both systems H & HJ are intolerant of phase/azimuth errors, making a decode almost impossible.

So, in an effort to ‘rescue’ these recordings it’s also going to need a process to enable the possible repair of these recordings, plus it may need reduced versions of the decoding process’ to enable a clean enough decode to be made.

That’s quite a bit of work still to be done to get the BBC’s two matrix systems from their year-long test transmissions in 1977/78 to a point where we are with the other systems.

This will be undertaken ‘as and when’ time allows, there is another project that is long over due and needs to be done, all i’m waiting for is some new hardware to arrive any day now, then its going to be full steam ahead.

What is it? I’m afraid you’ll have to wait and see. A couple of people know what it’s to do with, but at this moment in time the whole project is in my head, theoretically it should work… and we all know what happened to theory!!!


Norrie Paramor – 40 Years Of BBC T.V. Themes

13 Jun

Norrie Paramor - 40 Years Of Television DS393f frontWithdrawn due to pending new ‘Hydra’ decode

Released in 1976 and marked as stereo, it is actually an un-marked Matrix-H encoded album. This discovery takes the number of known commercially released Matrix-H albums to four!

Release: DS393f

Source: Matrix-H LP

Process: H-77/II


Lone Star – The BBC Quadraphonic Session

26 Feb

Lone Star - The BBC Quadraphonic Session DS354f front

Withdrawn due to pending new ‘Hydra’ decode

Three tracks produced by Tony Wilson for the ‘Alan Freeman Saturday Show’

Release: DS354f

Source: Matrix H CD

Process: H-77/II


Alan Freeman’s Saturday Show ‘Xmas Eve Quad Special’

24 Dec

Alan Freeman Quad Christmas Eve Show DS330f front

Withdrawn due to pending new ‘Hydra’ decode


During the BBC’s experimental quadraphonic broadcasts during the second half of 1977, producer Tony Wilson took the bull by the horns and remixed some of the sessions recorded for the John Peel and Alan ‘Fluff’ Freeman radio shows for broadcast on Alan’s three-hour Saturday rock show. One thing about these quad mixes is that they were mostly artists that never had any commercial quad releases, which makes them even more interesting.

Alan’s show was held in such a high regard that Pink Floyd allowed the quad mix of ‘Wish You Were Here’ to be broadcast, complete without interruption, during one show.

Although the experiment ended during autumn of that year, due to Matrix H being scrapped, during his Christmas eve show Alan broadcast a one hour special highlighting a small selection of “Tony Wilson’s quadraphonic creations”. In reality it would have been easy to fill the whole three hours of his show, and it is sad to say this was the last time any of the quad mixes were broadcast.

This release has been decoded from a reel-to-reel recording of that show, which thankfully in the most part was in good enough quality to allow an ‘almost’ faultless decode.

Artists include: The Steve Gibbons Band, Racing Cars, Andy Fairweather Low, Colosseum II, The Stranglers, The Motors, Phil Manzanera & Lone Star

“Alright?…  Not ‘Arf”

Release: DS330f

Source: Matrix H Radio Recording

Process: H-77/II


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