[photo-3d] 3D Sound

[Philip Steinman <philipsteinman@xxxxxxxxxxxxx>]

I've made binaural recordings long before (since 1990) I knew what
3D photography was (1998).  There is a group called DAT-Heads, see
http://www.solorb.com/dat-heads/Info.html
that record live concerts on DAT (Digital Audio Tape).  (Many people
now use mini-disc instead.)  Many of us use Core Sound binaural mics to make
great 3d recordings, see http://www.core-sound.com//mics.html
These are the best $230 mics you'll ever hear.  They record everything
from concerts (with no distortion at high levels) to nature sounds.
I clip them on the sides of my glasses next to my ear and get perfect
binaural sound.

Philip
------------------------------

 From the DAT-Heads microphone faq at
<http://www.josephson.com/mic-faq.html>.
What is 'binaural recording?'
Binaural recording actually predates stereo recording. In binaural
recording two microphones are placed near or in a listener's ears
(or alternately, an acoustically accurate dummy head's ears). The
sounds that the two microphones record are exactly what the
listener hears, including the effects of the outer ear (the pinna),
the acoustic shadow of the head, and inter-ear phase and
frequency response differences that provide localisation
cues (the information that lets you determine where a sound
is coming from).   When the binaural recording is played back
over headphones, the ambient sound field of the recording
location is reproduced more-or-less exactly. The sense of
being there is amazing and you can pick out voices in the
surrounding crowd and the placement of instruments to an
unparalleled degree. Until you've heard a binaural recording
played back over a good set of headphones, you haven't
heard how realistic a sound recording can be.

What microphones are available to do binaural
recordings?
Both Core Sound and Sonic Studios offer a range of miniature
microphones that mount near your ears and are suitable for
binaural recordings. For binaural recording purists, Core Sound
offer a set of in-ear microphones that mount in your ear canals
using custom made ear moulds. [lm]

{47}
I've heard that binaural recording are supposed
to be listened to over headphones. How do
they sound over speakers?
They sound good but different. Because binaural microphones
have nominally omnidirectional pickup patterns, you get roughly
the same effect as a spaced-omni microphone setup. But
because the microphone spacing is a bit narrow (7 to 9 inches
instead of the more typical 24 to 36 inches) the stereo image
may sound a bit compressed. Some binaural microphones can
be conveniently used with wider spacing. These provide the
usual spaced-omni performance. [lm]

{48}
Do you have to hold your head perfectly still
while making a binaural recording?
No. Slow movements or movements over a small range during
recording are normally unnoticeable during playback. Fast,
large movements can be perceived as a shift or rotation in
soundstage.



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