SQ Shadow Vector Soundfield Mapping

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Owen Smith

800 Club - QQ All-Star
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Apr 6, 2012
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Have now perfected SV decoding of the strange H and BHJ locus. I suspect the BBC never got close to decoding their own weird system with any accuracy, even in the digital domain its not easy.

What is BHJ? I know about the HJ matrix but I've never heard of BHJ.
 

Owen Smith

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OK it's the 2 channel matrix version of UHJ. I've heard decodes of that before rendered ambisonically, and when it works the listening experience is sublime. The speakers just vanish, they cannot be identified as point sources. Most or all of the ones I have heard were Nimbus releases (I think Nimbus is the name).
 

quadaholic

Senior Member
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Newtonville MA
Very very interesting. Seeing as it looks like we're going to be in lockdown all winter I will have some time to attempt to figure out how this all works.
 

malcolmlear

Active Member
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Apr 7, 2008
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Colchester UK
A few days ago I noted one of the Surround Master tests was a tough one involving 4 simultaneous tones, one for each channel. Even though the SV decoder is now moving into production it seemed a very interesting test to perform. The test tone generator has now been updated to include this '4 corner' test. Instructions to use can be found in the zip.
 

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  • TestToneWaveGenV031.zip
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malcolmlear

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Here are the test results. I've used the same tone frequencies as used by Involve, i.e. LF=200Hz RF=1.5kHz, LB=5kHz and RB=600Hz.
 

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  • RF 1.5kHz.png
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  • LB 5kHz.png
    LB 5kHz.png
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  • RB 600Hz.png
    RB 600Hz.png
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malcolmlear

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Well as most well know this chip shortage is a real pain and costs/availability will reflect this. However I'm pretty sure first units can be shipped by the end of this year. I'll have a better idea of costs once I've gone through production quotes. I'm putting together a finalized specification and will release this in the next few days.
 
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Owen Smith

800 Club - QQ All-Star
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Here are the test results. I've used the same tone frequencies as used by Involve, i.e. LF=200Hz RF=1.5kHz, LB=5kHz and RB=600Hz.
Can you expand the X axis please? Over 75% of it is unused, and all the useful data is squashed together at the left hand side.
 
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malcolmlear

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As requested with expanded x axis.
 

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  • LF 200Hz 2.png
    LF 200Hz 2.png
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  • RF 1.5kHz 2.png
    RF 1.5kHz 2.png
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  • LB 5kHz 2.png
    LB 5kHz 2.png
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  • RB 600Hz 2.png
    RB 600Hz 2.png
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malcolmlear

Active Member
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Apr 7, 2008
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And just out of interest, the QS encoded Lt and Rt channels.
 

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  • Rt Encode.png
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furui_suterioo

Quad & 70s Enthusiast
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Sep 5, 2018
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kgLoks Agenjegleks, gCagliforgnjiga
Well as most well know this chip shortage is a real pain and costs/availability will reflect this. However I'm pretty sure first units can be shipped by the end of this year. I'll have a better idea of costs once I've gone through production quotes. I'm putting together a finalized specification and will release this in the next few days.

BJMarsh, post: 629233, member: 2930"]
Excellent, Malcom. Keep me updated on your progress. When do you expect production units? Target price?
[/QUOTE]
Soundfield, post: 629234, member: 6638"]
Quite the throw away line there Malcolm! Any details you'd like to share?
[/QUOTE]
Ditto
 

barfle

600 Club - QQ All-Star
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Oct 28, 2005
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667
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Meridian, ID
Well as most well know this chip shortage is a real pain and costs/availability will reflect this. However I'm pretty sure first units can be shipped by the end of this year. I'll have a better idea of costs once I've gone through production quotes. I'm putting together a finalized specification and will release this in the next few days.
Anything new to report? I hope things are going well, but it’s been several months since an update.
 
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