Hi,
Linguistically it can be said that "stereo is 3D". "Stereo" has
come to mean two loudspeakers with two separate 'independent' audio
channels. "3D audio in stereo" is then most easily understood to mean
"3D audio using two audio channels".
This then means binaural, and headphone listening, or some
'transaural' technique using crosstalk cancellation to play a
binaural recording over a pair of speakers. Binaural doesn't always
work entirely, even using recordings made using your own ears and
listening back with headphones through the same set of ears.
Its main advantage is that no real extra hardware or extra
transmission channels are required than for normal "stereo".
As I assume you would be mixing several streams of audio together to
make your programs you would need to encode each stream separately
spatially, with one or more suitable encoded global reverbs to aid
distance perception. You could encode to ambisonics (you'd probably
need a decoder and 8 or more speakers, carefully set up, to hear this
properly) then recode to binaural. Because binaural coding uses
complex filtering to encode virtual speaker signals audio artifacts
start to occur, the more audible the more virtual speakers.
The alternative is direct binaural encoding of each stream. This
sounds better probably because the binaural filter is used on a per
source basis rather than on all of them. There is then a problem of
how to make a binaural reverb, possibly truly impossible as really
there is only reverb which is heard binaurally. A compromise would be
an ambisonics based reverb which was binaurally encoded, where the
colouration would be more acceptable.
Other obvious cues as to distance are level (not effective on its
own, especially without movement) and HF absorption ( only happens
appreciably at fairly considerable distance, but useable for artistic
effect).
There are some binaural plug-ins for DAWs around, but fewer for
ambisonics which is much more dependent on the surround audio
architecture of the DAW.
You could try my programs "3DAudioScape" and "3DAudioScape Binaural".
The former is ambisonics which can be recoded to binaural, and the
latter binaural with an ambisonic reverb engine. They are both demos,
Mac only at present, muting every so often for about 4 seconds. I've
tried to make them so you can load programming data from one into the
other and produce acceptable results.
They're designed to work on the multiple outputs of a DAW.
They're at
http://www.3d-audioscape.com
Ciao,
Dave
On 10 Jun 2014, at 17:00, sursound-requ...@music.vt.edu wrote:
On 9 Jun 2014, at 1:05 am, 霖の <951343...@qq.com> wrote:
Hi, there,
I'm radio program producer and recently my boss asked me to think
about how to produce 3D audio in stereo. I understand thus sounds
ridiculous and can't be make out . But what i'm thinking is any
way to make the audio work having clearly distance information and
direction information? I tried to turning Ambisonics audio into
binarual audio which have some feelings like that. However, I can
not make it all the time when it comes to business production. Do
you have any good methods? By recording、editing in DAW or by max
patch, etc.
Thank you very much!
YL
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