--- In Lou Judson <> wrote:
>
> Found it - the print edition of Electronic Musician, August 2008,
> page 30: "Sweet Space" (not online yet). Made by a British company,
> http://www.airsound.net/ so glad you made me look it up online. There =
> are links to a variety of implementations, from home theater to small =
> iPod speakers you can hang around your neck. Wow, imagine carrying
> your own soundscape recordings so you cam walk around in a bubble of
> natural sounds, an oasis in the city! (I should write ad copy for
> them...)
Thanks Lou.
Based on the info below,
taken from a review based on a white paper,
it appears to me that the circuitry is
an implementation of the time worn Hafler
circuit.
The new angle is having the sound emanate
from a (near?) point source, i.e. both
the main signal and the out-of-phase
information are coming from the same
physical box, with the 'ambient' info
coming from a dipole (i think), co-located
with the monopole for the 'mid' signal.
there's also mention of use of the
'surface effect' principle, but that
one is not clicking in my mind just yet.
this seems to be very new - no mention on
any of the audio forums that I could find -
Audio Asylum, Head-fi, Taperssection,
Gearslutz, Audiogon, Stereophile, Sound
on Sound, etc.
a brief mention on Sursound - back in December.
thanks again,
clay
http://www.twice.com/article/CA6570501.html
"Airsound-equipped speakers, which incorporate amplifier and
non-DSP-based electronic processing, work like this: A front-firing
main driver is complemented by two smaller side-firing speakers that
operate in reverse polarity. The front speaker reproduces the main
signal, and the side drivers deliver spatial signals. Circuitry in the
amplifier derives a main signal and separate spatial signal from a
regular left- and right-channel stereo input. The circuitry adds the
left and right stereo channels together (L+R) to create the main
signal, which incorporates all of the information common to both the
left- and right-channel inputs. The main signal is sent to the front
driver. The circuitry also subtracts the left signal from the right
signal, "canceling out all of the common signal information and
leaving just the spatial information," then sends the spatial signal
to the side drivers, a company whitepaper said.
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