14 Mar
2007
14 Mar
'07
9:02 a.m.
On 14 Mar 2007, at 10:10, Joern Nettingsmeier wrote:
Steve Harris wrote:
Hi Joern,
Hmm, interesting, though it sounds like you'd need a specialised UHJ
ambisonic decoder to play it back. That probably narrows the audience
even further.
- Steve
On 13 Mar 2007, at 09:15, Valent Turkovic wrote:
i'm very new to ambisonics, so i may be wrong, but i think there
are indeed stereo compatible first-order ambisonics streams. iirc,
the format is called UHJ, and it matrixes WXY (lossily) into L/R
(i.e. no height information).
i've changed the subject to bait fons :-D
if we're lucky he knows an implementation of 2-channel UHJ.
i found this article: http://www.ambisonic.net/ambi_AM91.html
but it does not give details as to how the matrix encoding is
accomplished. Hi,
is it possible to record multi channel speech audio and down
sample it
2 stereo channels BUT with horizontal audio positioning of each
audio
channel ie. like dolby surround effect.
Sure, but you might be disappointed by the
results, Pro Logic is
not very sophisticated (eg. there's no separate rear left and
right channel, and the bandwidth is limited). Also the only free
software implementation that I know of is not state of the art,
partly due to patent problems, and partly due to lack of interest.
There's a LADSPA plugin: http://plugin.org.uk/ladspa-swh/docs/
ladspa-swh.html#id1401
which does Pro Logic matrix encoding, you will need some other
software to mix your independent streams into LCR channels (you
can do it by ear with a 3+ variable send bus mixer), but once you
have that you can feed it to the plugin and get a pro logic
compatible stream out.
PS ignore the documentation, it has been tested, and it does work,
just not brilliantly. You will get better results if you EQ the
mics a bit to cut the level of the highs and lows a bit,
especially in the rear channel.
You would get much better results with an ambisonic stream, but I
don't /think/ you can make stereo-compatible ambisonic streams,
and not many people have ambisonic decoders. Other people on this
list know a lot more about ambisonics though.