Daniel Courville wrote:
> Maybe it's a question of terminology
Yes. It's a question of terminology.
When using impulse response files from Angelo's site, he has named the
UHJ to
"B-Format" conversion files , as _decoding_ (dec).
_Encoding_ (enc) files are used for conversion from B-format to UHJ.
Sampo Syreeni wrote:
I'd argue there *is* no conversion from UHJ to B-format
I know.
The way I understood Mark Anderson's question, that he is looking for a
_practical_
way to decode his existing UHJ recordings into surround loudspeaker playback
with a software solution, ie. a software replacement for using UHJ
decoding in a
tuner amplifier, such as the Onkyo SV909.
As far as I know, there are no software UHJ decoders into loudspeaker
feeds available
at all. This is easy to understand, because the demand for such software
would be very
little. (Both Onkyo 909 and the Meridian 565 use digital processing and
do decode
UHJ, but they are not what we are talking about.)
I have converted some amount of UHJ recordings into loudspeaker feed
signals in
the way that has been already discussed. I just haven't done it in
Reaper, I have been
using AudioMulch, because it's simply a program that I am used to. This
is what I do:
Conversion from UHJ to W'X'Y' "B-format", then conversion from that into
loudspeaker
signals with a UHJ decoder VST plugin. The subjective listening
experience of this is
good enough for me, it cannot be worse than using an analog UHJ decoder
such as a
Minim or Troy. At least the software process doesn't add noise to the
signal. It doesn't
matter if the decoding isn't theoretically right, using an analog UHJ
decoder doesn't
provide any better accuracy either anyway. As Sampo says, when the
signal has been
UHJ encoded, there is no way to retrieve the original B-Format.
I have quite a lot of Ambisonic UHJ CD:s and I'd rather listen to them
as decoded into a
surround setup than listening to them in stereo with two speakers.
And by the way, the majority of UHJ encoded music releases _was_
recorded with a
Soundfield type microphone, because the largest number of them were made by
Nimbus Records. Nimbus didn't use the Soundfield-made microphone, they
used their
own setup made of two fig of eights and an omni. They did that mainly
because the
Soundfield was too noisy and they didn't need the Z signal, as it
couldn't be encoded
into UHJ and carved onto vinyl anyway.
So, all Reaper users out there, please tell Mark how to do the routing
in Reaper. David
already was in the business.
Eero
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