SQ Shadow Vector Soundfield Mapping

[surround.sound.enthusiast]

Would it interest anyone if I were to port the decoder to VLC? I haven't done any coding for VLC but it seems well documented and cross-platform. Only question is if there is any interest?

Late to the game, but: You Bet!!

 

[Owen Smith]

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.

 

[Sonik Wiz]

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

In booklets I have from the NRDC they refer to Basic HJ 2 ch format. It later on was termed UHJ for Universal HJ.

PER: Two-channel UHJ was extended into a hierarchy of C-Formats for 2, 2.5, 3 and 4 transmission channels, termed BHJ, SHJ, THJ and PHJ, respectively. The extra channels are used to augment the two base channels to give improved horizontal surround sound and, for four-channel UHJ (PHJ), periphonic (full-sphere) surround sound. In practice, only two-channel UHJ (BHJ) encoded material has ever been released. For this reason UHJ has become a synonym for BHJ, and UHJ is the symbol you will see on LPs and CDs..

 

[Owen Smith]

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]

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]

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.

 

[malcolmlear]

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.

 

[malcolmlear]

And the QS decoded output waveforms.

 

[BJMarsh]

Excellent, Malcom. Keep me updated on your progress. When do you expect production units? Target price?

 

[Soundfield]

Even though the SV decoder is now moving into production....

Quite the throw away line there Malcolm! Any details you'd like to share?

 

[malcolmlear]

And for reference, the Encode.

 

[malcolmlear]

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.

 

[Owen Smith]

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.

 

[malcolmlear]

Yes, sure no problem.

 

[malcolmlear]

As requested with expanded x axis.

 

[malcolmlear]

And just out of interest, the QS encoded Lt and Rt channels.

 

[furui_suterioo]

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

 

[gene_stl]

me three

 

[BJMarsh]

It’s almost Christmas. Looking for a nice gift. I’d love to see Malcom’s SV decoder under the tree! Any updates, Malcolm.

 

[barfle]

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.