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Alphatron
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1994-09-26
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From tws@xenon.stanford.edu Mon Sep 26 13:39:49 1994
Date: 14 May 1994 23:46:36 GMT
From: Toni Walter Schneider <tws@xenon.stanford.edu>
To: sci-virtual-worlds@uunet.uu.net
Newsgroups: sci.virtual-worlds
Subject: 3D-SOUND: Crystal River Announcement
COMMERCIAL
Crystal River Engineering Inc. announces the ALPHATRON, another
price/performance breakthrough in 3D Sound systems. An Alphatron
system plays back two sounds (wavefiles) and places them
anywhere in a three-dimensional space surrounding a listener.
Up to eight systems can be combined into a PC and controlled by
one software library to spatialize 16 concurrent sound sources.
The complete development kit is priced at $695 per system.
Alphatron uses HRTF filters, the only real-time 3D sound method,
that can accurately display sounds anywhere around a listener
and which has been verified by psycho-acoustic researchers around
the world. The Alphatron features Crystal River's HRTF compression
method (patent pending), which allows full range, Convolvotron
quality, spatialization on affordable hardware. Spatial Sound
can be presented over conventional stereo headphones or near
phones (stereo speakers placed near the listeners ears).
An Alphatron development system consists of a single ISA (PC)
slot signal-processing card, and a C software development
package, complete with DOS and Windows libraries, example code
and an extensive test and demo program.
The first Alphatron will ship June 15, 1994.
Performance:
-two spatialization channels per card, using compressed (equivalent
to 256 coefficient/ear) HRTF filters.
-40MHz Motorola 56001 DSP.
-update rate: 44Hz (88Hz if only one channel is used).
-sample rate: 44100Hz.
-average delay: 23msec.
-input: 64 x oversampled, 16-bit A/D converters.
-output: 8 x oversampled, interpolating filters.
-stereo crosstalk: 100Hz -100dBV, 1kHz -80dBV, 10kHz -60dBV.
Contact: Stephanie Cadet Scott Foster
Crystal River Engineering Crystal River Engineering
490 California Ave., Ste. 200 12350 Wards Ferry Road
Palo Alto, CA 94306 Groveland, California 95321
tel: (415) 323-8155 tel: (209) 962-6382
net: info@cre.com