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- ********************************ANNOUNCING***********************************
-
-
- FOCAL POINT(tm)
-
- 3D Audio For The Macintosh II
-
-
- FOCAL POINT brings directional binaural sound to the Macintosh. Multiple
- sounds or audio icons come from anywhere around the listener, localized and
- animated in real time. Sounds come from Macintosh soundfiles, synthesizers,
- or outside sound sources.
-
- FOCAL POINT is an INIT for the Macintosh. It goes in the System Folder, uses
- about fifty kbytes of memory, and creates a group of new function calls similar
- to Toolbox calls which provide system-wide access to 3D sound. Each 3D sound
- channel requires one Digidesign Audiomedia card, up to as many as you want to
- install.
-
- On startup, FOCAL POINT DSP code loads into the Audiomedia's Motorola 56001
- processor. Spatial audio processing then goes on independent of the Macintosh.
- Applications or INITs using 3D sound don't slow down.
-
- Using FOCAL POINT, you can quickly
- -create a multi-object spatial audio display system
- -create a spatial audio interface for the visually impaired
- -create a many-voice teleconferencing system
- -create the audio equivalent of the Graphical User Interface
- -use directional audio icons to declutter the graphical screen
- -use directional audio as a navigation tool in your application
- -create MIDI-driven 3D sound objects
- -create 3D sound edits with Soundtools, Audiomedia, and other editors
- -add 3D sound to your multimedia presentations
-
- Some of these uses can be demonstrated right away by simply turning on audio
- mouse pointing in the FOCAL POINT Control Panel. FOCAL POINT will work while
- you're running a related application or INIT which produces its own sounds.
-
- FOCAL POINT's output is two channels just like stereo but with spatial
- information built into the signals. It's equalized for headphones but for
- some applications, particularly sound editing, loudspeakers work too.
-
- FOCAL POINT convolves the audio signal with head-related transfer functions
- to generate binaural outputs for the left and right ears. Transfer functions
- are computed in the Motorola 56001 processor, not the Macintosh. Audio is
- 44.1 KHz, 16 bit CD quality.
-
- Adding FOCAL POINT 3D audio to an application is easy. There are only two
- main calls, Init3D() and Set3D(). They act like part of the Toolbox and can
- be called from any programming environment. Init3D(Ptr channel) is called once.
- It installs FOCAL POINT 3D code in the DSP and returns a pointer to the channel
- if an Audiomedia card is available. Set3D(Ptr channel,int az,int el,int dist)
- changes a sound's location. Its arguments are channel, azimuth, elevation, and
- distance. Set3D() is fast and can be updated in the main event loop without
- waiting around.
-
- Sample applications which support headtracking and RS232 host functions come
- with FOCAL POINT. Also included are the THINK C library objects for these
- extra functions so programmers can use them to build new applications.
-
- FOCAL POINT is available for quantity licensing. The FOCAL POINT 3D DSP code
- also quickly ports to other platforms with the Motorola 56001 processor.
-
- PRICES
-
- FOCAL POINT INIT and software package, per channel $295.00
- Digidesign Audiomedia card with required modification at no cost $995.00
- ________
- COST PER CHANNEL $1290.00
-
- Customer-supplied Digidesign Audiomedia cards can be modified and tested for
- $245.00 each. Shipping is additional.
-
- Order FOCAL POINT from:
-
- BO GEHRING
- 318 W. Galer Street
- Seattle, WA 98119
- 206-286-8922
- gehring@dgp.toronto.edu
-
-
- FOCAL POINT is a trademark of Bo Gehring
- Audiomedia and Soundtools are trademarks of Digidesign Inc.
- THINK C is a trademark of Symantec Corporation
- Macintosh is a trademark of Apple Computer Inc.
-
- =================
-
- Date: 25 Oct 91 01:39:07 EDT
-
- >[MODERATOR'S NOTE: I sent Tim the general info we have on citations, but
- >if someone can send to him or us (Mark and me) the current information for
- >Crystal River Engineering and Gehring Inc. (Focal Point), as well as any
- >other 3D sound systems, we can include the info in a FAQ. Thanks. -- Bob
- >Jacobson]
-
- Bo came to Boston in August, 91. I invited him to give the 2nd half of a VR
- lecture that I gave for the Greater Boston SIGCHI group. We stayed up til very
- late talking about the old days of SigGraph, etc. What a neat guy!
-
- His company, Focal Point sells a board with some of his software on it.
- The input to the board is 1 mono analog audio channel and x,y,and z position
- for the output. The output is 2 analog audio channels that effectively place
- the sound at the specified location for the headphone wearer. The output can
- also be applied to speakers and does surprisingly well, though I was much more
- interested in headphone use.
-
- The board is a slightly modified Audiomedia card made by Digidesign.
- It plugs into the Macintosh nubus. It contains the Motorola 56001 DSP chip
- and CD quality A to D conversion and D to A conversion. One of the most
- impressive demos I listened to was simply feeding 1 channel of a CD player and
- the mouse position [just x and y] into the board. The correspondence between
- the position of the mouse and the location of the sound was very clear. His
- software allows you to make a large virtual screen so that the mouse can
- indicate positions quite far from the actual physical screen.
- [I wish visual virtual screens were this cheap!]
-
- You can also control the position via RS232 or MIDI. Bo supplies some Think C
- routines so that you can control the sound via your own programs. The updating
- of position parameters can be fast and glitch-free, though it doesn't do
- dopler shifting. Each card can only control the position of 1 input channel at
- a time. It also does not do any reverb, an important environmental cue. [You
- can, however, reverb the input channel before it enters the card, or even
- reberb each output channel with off-the-shelf hardware.] Bo's distance cue was
- simply volume, which is realistic for wide open spaces but not interiors or
- inner cities. For close sounds [several feet], not doing any reberb is just
- fine.
-
- The last verson of the Convolvotron that I heard [at VPL, March, 91] could do
- 4 channels in real time and had programmable reverb for each channel. Note
- that my listening to each was several months apart so its difficult for me to
- even state a decent subjective impression of the difference in localization
- quality amonst the two. The Convolotron has one H*ll of a lot more compute
- power [300 MIPS as I recall] in it than the single 56001 in Bo's system. Bo
- has come up with a particularly clever algorithm and gets away with much less
- processing power.
-
- Perhaps the most dramatic difference between the two for the end user is
- price. The Audiomedia board costs about $1K and the software an additional
- $500 [August 91 prices]. Four of them would cost you $6K. The Convolovtron
- costs something like $20K [March 91 prices, may well have fallen since].
-
- Contacts for Bo:
- 318 W. Galer St., Seattle, WA 98119
- But phone or fax him in Toronto 416 963-9188
- Internet: gehring@dgp.toronto.edu
-
-
-