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From: dxt@hyperion.haystack.edu (David Tetenbaum)
Newsgroups: rec.audio.high-end
Subject: New audio product
Message-ID: <7212@uwm.edu>
Date: 25 Oct 90 12:50:36 GMT
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I was leafing through the trade rag "Research and Development" (Oct 1990)
when I spotted the following:

"Three-dimensional audio signal generator (Sound Retrieval System)
dynamically processes and adjusts conventional stereo signals to provide
a stereo sound system with a noticeable depth feature using only two
speakers."
"The system electronically sums (L+R) and subtracts (L-R and R-L) the
conventional left and right stereo signals and, after processing and
equalization, reconstructs them into new left and right signals."
"The difference signals of a stereo sound sytem provide the spatial
information and directional cues to the human hearing system. Microphones
have flat responses to sounds coming from the sides and front and are
dead to sounds from the back. Conventional stereo systems can produce
incorrect spectral responses to the front and side sounds."
"The system emphasizes and restores the reflective or side sounds that are
inherent in the difference signals. It also acoustically creates a 
center component that locks on vocals and dialogue."


Hughes Aircraft Co. manufactures this device, which is recognized by the
magazine in the year's 100 best High-Tech awards. 

Anyone listened to one?

David Tetenbaum
M.I.T. Haystack Observatory
Westford, MA.

e-mail: dxt@hyperion.haystack.edu