Ambisonic uhj-b format

Hi,
I have an Ambisonic recording, Runrig - The Cutter & the Clan that I want to decode. I have searched the web and links posted in this forum section but cannot find anything suitable. There are references to Angelo Farina's web site but he no longer has the FIR impulse responses available to use under plogue bidule or audiomulch. Another reference led me to "Ambisonics.exe" an alledged command line decoder, but again nothing.
The state of Ambisonics on the web is poor, seems like a lot of information but no structure !

Any help appreciated.

Malcolm

anything at http://www.ambisonic.net/index.html ??

I checked again, and deep in the depths of Daniel Courvilles site I found the impulses.

Hooray !! now I will decode this cd and see what it is like surround wise.



Malcolm

Malcolm, it sounds interesting
Can you post your decoding method? I've found a site with lots of Ambisonics samples and their DTS 5.1 decoded files. It would be nice to A/B them
I can't remember where actually :xp:

Using the method here :-
http://pcfarina.eng.unipr.it/Aurora/conversion_between_uhj_and_b.htm
I set up Audiomulch, the impulses etc. as shown but the decoding is a mess, no definition or separation. I will try again later today although I cannot see what I am doing wrong.

Malcolm

Malcolm, I tryed with VST plugins and I really can't get much out of it.
Hope you'll get something acceptable.
BTW, the link I found had tests files on it, I saved them in my pc. If you need'em let me know.

Found thi googling:


"MATRICES IN THE 70S



Ambisonics at the time of the mid-70s used a matrix known as 45J.

BBC Matrix H was developed from an earlier Ambisonic matrix (H), to which the BBC added their own tweaks for improved performance.

There followed Matrix HJ which unified Matrix H and 45J.

UHJ included Duane Cooper's work, which was an important contribution.

The "U" for "Universal" comes from the marrying of Matrix HJ with UD-4 technology to create the final matrixing scheme. BBC continued to use Matrix HJ after Ambisonics went to UHJ as a consumer format conveyed by two channels compatible with stereo equipment. The general move to UHJ dates from around 1980."

Does this mean UHJ is close to Matrix H?

Here's some more info on wikipedia

http://www.ambisonia.com/wiki/index.php/Playback_Software

Lucanu the term UHJ came from a Matrix H and Matrix 45J derivative. I have a Compcor decoder that does both 45J and Matrix H, I may just try that and see what comes out of it.

I have scoured the web for information, lots of dead links and technical discussion but UHJ decoding is elusive. The sad thing is that just over 1 year ago I sold my Minim AD-10 ambisonic decoder as I no longer had a use for it.

Malcolm

Malcolm, I scored a VST plugin that does decode Ambisonic. Here's a direct link
http://www.computermusic.ch/files/pc_vst_ambisonic.zip

Thanks for the link, I have that already. It is a B-Format decoder that does not accept UHJ. I used it in the Audiomulch decoder.

Malcolm

Ok, there's another link that encodes UHJ to b-format. http://www.radio.uqam.ca/ambisonic/uhj_b.html
You can decode b-format next to achive 5.1 I suppose

:banana:
You'll need to make a PCB, but you could do it the old analogue way too http://www.geocities.com/ambinutter/pictures/Ad7.jpg

RK

Here's the easy way!

Kal

Sure is. And almost for free! :sun

Rolv-Karsten

rolvkarsten said:

Sure is. And almost for free! :sun

Rolv-Karsten

Click to expand...

In effect, it was as I got the 861 for entirely other reasons and was not aware of this function until after.

Kal

Kal Rubinson said:

In effect, it was as I got the 861 for entirely other reasons and was not aware of this function until after.

Kal

Click to expand...

Hi Kal
Ambisonics is a fine surround system. How do you like it? I would expect your Meridian DSP implemented version to be far better than my analogue Minim AD-7.
Does you Meridian decode only UHJ, or does it handle B-format also? Have you also tried out the "Superstereo" and "Trifield" modes?

Regds
RK

rolvkarsten said:

Hi Kal
Ambisonics is a fine surround system. How do you like it? I would expect your Meridian DSP implemented version to be far better than my analogue Minim AD-7.
Does you Meridian decode only UHJ, or does it handle B-format also? Have you also tried out the "Superstereo" and "Trifield" modes?

Regds
RK

Click to expand...

UHJ & B-Format.

I rarely use any of these modes. Occasionally, I use Ambisonics when I suspect that the recording was made for this purpose and TriField for "effect" to expand large ensembles on a stereo source. Generally, I use direct or stereo, as appropriate.

Note that I am a little different from most folks here in that I am dedicated to getting the most accurate reproduction I can and multichannel is one important component. I am not dedicated to quad or surround, per se.

Kal

Yes, Kal, I know, and you are one of those I read with pleasure.
Thanks for your reply!