Decoding Process’s

Over the time of the blog i’ve continually improved the decoding process’s for the various matrix systems that were used by record company’s to encode four channels onto a stereo LP.

I’m now at a point where i feel that there is very little improvement that can be made using the tools we have at hand at this time, so many of the process’s are being upgraded to include my recent work on solving the individual issues of each system that were not possible to deal with, or talked about, in the 1970’s and will be the end to my research and development of such process’s.

To distinguish these from all previous process’s they are named after ‘mythical’ creatures:

DY: ‘Unicorn’

EV-4: ‘Centaur’

QS: ‘Sphinx’

SQ: ‘Phoenix’

Matrix H: ‘Hydra’

Matrix HJ: TBA

The following process’s remain the same:

Dolby Surround: DS/IV

45J: Ambi-45J


Super-Stereo: Ambi-SS



7 Responses to “Decoding Process’s”

  1. Steven Sullivan June 19, 2017 at 20:17 #

    Also before you shut off the lights, could you post the names of your SQ scripts as they evolved from first to last version?

    • oxforddickie June 19, 2017 at 20:23 #

      The last ‘script’ was SQ-Final, a few years ago now.

  2. beukenoot October 26, 2014 at 22:19 #

    AP – Stereotomy was it in this Ambisonic decoded?

  3. gjwAudio September 2, 2014 at 01:49 #

    Hi OD

    Regarding Amb-SS, can you elaborate on how you use the process to create material for DSQB-II. I imagine it is the tool used to create B-format files from “regular” 2-channel, which are then sent through a subsequent decode-to-quad step.

    Are there parameters to adjust in SS, that will modify the results coming out of the quad-decode ? Do you run a test pass, evaluate, and perhaps go back to the SS stage to “twiddle the knobs” ?

    I’m curious because I have a little project in mind that may benefit from these Ambisonic treatments. Any insight would be much appreciated.


    • oxforddickie September 2, 2014 at 01:59 #

      You are correct in that it is a process that converts a standard two channel source to a quasi B-format format that is then converted into a standard four channel format.

      The two channel to B-Format process is actually pre-set. Once i’d formulated the mathematical process i decided to leave it alone. It would be possible to add controls to vary the width etc, but so far the mathematical equation used seems perfect without any further alteration. Sometimes, basic is best!

      Hope that answers your question.

      • gjwAudio April 30, 2017 at 22:06 #

        Hi OD

        Before you Turn The Lights Out on the blog and drop off the map, may I ask for clarification ?

        What steps do you follow (…and can I replicate at home) to take a 2-channel file through B-Format and into the final 4.0 mode ?

        I have a live show recording I made of The Flower Kings in Montreal which I’m sure would benefit from the “Super-Stereo: Ambi-SS” treatment.

        Thanks in advance for advice (and the benefit of your experience) 🙂

        • oxforddickie April 30, 2017 at 22:26 #

          To convert a standard stereo file using ‘Ambi-SS’ you need to do a specific stereo to B-Format decode. This is different from the standard UHJ to B decode that is normally done when converting UHJ to Quad.

          Sorry to be vague and basically repeating what you already know but the technicalities of my Ambisonic process’s are locked away in my grey matter, and to be honest i’ve not decided what, or if, to do anything with it.

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