A description of all of the Quadraphonic matrix systems used to date


9 Responses to “Matrix+”

  1. Owen Smith June 13, 2013 at 13:52 #

    If Dolby Pro-Logic/II is close to SQ, presumably you could produce scripts to decode it (without a Centre speaker?). But would there be any point? Would the scripts do a better job than modern home cinema amps (I suspect they would since amps have to decode in real time)? And has any music been released in Pro Logic/II? I’ve always wondered whether film soundtrack CDs are encoded for example.

    • oxforddickie June 13, 2013 at 14:08 #

      This is a sticky subject. Dolby Labs stole the SQ equation, turned it around and removed one part of it, but it was still obvious where it came from. Dolby were taken to court and lost, ending up buying certain rights, which makes you wonder why, when devoloping DPII they didn’t revert back to SQ. Just think of what that would have meant.

      Unfortunately, that leaves DP & DPII incompatible with SQ.

      I did somework on the ‘Dolby Surround’ deoding,basically because of the number of Dolby encoded CD’s out there, including the Tomita one. The one thing the process had over the decoder was the same as all the other process, it removed the unwanted information, giving the sound a better feelof separation, even though the rears are still mono.

      I’ve never understood why DPII was never used for music, never seen any encoded, just a few games. Waste of an oppertunity.

      The Soundtrack albums are normally either re-recordings, or re-mixes (Tommy being a perfect example)

    • Owen Smith June 13, 2013 at 18:24 #

      Indeed had Dolby reverted to SQ for DPII we’d have all had real time digital SQ decoders in our home cinema amps by now. What a shame.

      However I’ve seen statements that Dolby wanted the DPII decoder to do a reasonable job decoding Dolby Surround and given that half the time when faced with a stereo matrix surround DVD you have no idea which encoder was used for it (since they don’t print it on the label) I can see the point. I leave my amp set to DPII all the time for stereo surround DVDs.

      Whether DPII really achieves that compatibility with Dolby Surround and whether reverting completely to SQ would have hurt that is unclear to me since I’m not familiar with the matrix equations. There’s also the Centre speaker for DPII, not sure how they could have kept that if they’d reverted to SQ. It seems possible though, it’s just processing on the stereo front soundstage.

      • oxforddickie June 13, 2013 at 18:30 #

        The center channel didn’t actually exist in either DS or DP. It was artifically created in the decoder using this equation:

        Ct = 0.707 Lf + 0.707 Rf

  2. sacdtodvda April 10, 2013 at 23:14 #

    Congratulations on the EV-4 decode! Although your first release isn’t to my taste, It sounds like you are closer to some DY releases. Looking forward to some Brothers Wilson & Co.

  3. beukenoot April 10, 2013 at 16:54 #

    Thanks for the explanation. I hope you will do UHJ as well (special Alan Parsons)

    What is by the way the difference between Dolby Surround and DS “Prologic” ??
    They used the same source. I once owned a DS decoder and a Laserdisc player with movies in DS. That was not bad at all. (Back to the future 1,2,3)..

    (now I have them as dvd and blu ray and it is every time fun when my wife is away for few days to play the whole story .. takes whole evening and night lol. )

    • oxforddickie April 10, 2013 at 17:05 #

      UHJ is on the list……

      The difference between ‘Dolby Surround’ & ‘Dolby Pro-Logic’ is that additional logic type similar to that used in advanced SQ/QS decoders was incorperated into the basic ‘DS’ decoder to give the impression of increaded Front/Rear separation.

      Of course, the rears were still just band-width limited mono. Stereo rears didn’t happen until Dolby released ‘DS P/II’, which never took off, as it was released too late because the digital revolution had overtaken it.

    • Owen Smith April 10, 2013 at 19:49 #

      I use Dolby Pro Logic/II all the time when watching TV (except for 5.1 programmes on Freeview HD). It definitely produces better results than straight Pro Logic.

      • oxforddickie April 10, 2013 at 19:57 #

        Yes, it would give a better effect as they ‘almost’ reverted back to the original SQ equations they stole for the original DS.

        AND NO!!! it does not mean DS P/II is SQ compatible. They changed the equation enough to make it incompatible in the hope nobody noticed. But they did, and they ended up having to buy SQ from Columbia.

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