VI. STEALTH STEALTH is a multimedia presentation that is both preprogrammed and interactive. It comprises an X-Y scanning table and a third scanning rail, all with video cameras. It includes an array of phototransistor and infrared sensors and a pair of joysticks as input devices, and both audio and visual outputs. As it is now configured, STEALTH is shown pictorially in Figure VI-1 and schematically in Figure VI-2.
Fig. VI-1. The STEALTH Table

SubWoofer

Z Axis

Y Axis LCDB IR1 LCDC IR2

X Axis
LCDA & JoySticks Z X&Y
Fig. VI-2. STEALTH Layout
The STEALTH system concept allows for a great deal of flexibility in how the components are arranged and operate. Communication between components is in the MIDI format, allowing interchangeability between quite different functions. A preliminary schematic of the system is shown in Figure VI-3.
Sensorlab MIDI Interface Audio Sampler Dimmers Audio Processor Lights Mono Amp MIDI Mixing Board Stereo Amp Stepper Driver Stepper Driver Stepper Driver Subwoofer
Spkr Spkr X Stepper Y Stepper Z Stepper
Digital Sequence Recorder

Network

Host Computer

Stepper Motor Controller

Projector Laser Disc Camera Power & Signal Box (2) LCDA Matrix Switcher Video Analyzer LCDB LCDC (2) Camera

PRELIMINARY

Fig. VI-3. STEALTH System Schematic
Major components are listed in Table VI-1. Table VI-1. Major STEALTH Components
Component Manufacturer, Model
Host Computer Stepper Controller Stepper Motor Drivers Laser Disc Player MIDI Mixing Board Audio Processor Audio Sampler Digital Sequence Recorder Mono Amplifier Stereo Amplifier Light Dimmers MIDI Interface MIDI Patch Panel Video Camera Power/Signal Box Power Supplies Stepper Motors
Custom built Oregon Microsystems, SRX-4 Centent, CN0142 Pioneer, LD-V8000 Yamaha, DMP7 Alesis, Q2 Peavey, SP Yamaha, QX21 Carver, M400 Fuhrman, SP-20A Leprecon Sensorlab Custom built Custom built TDK, 24-4R5GB and 05-20RGB ASTROSYN , 23LM-C001
Environmental lights are controlled through two six-outlet MIDI light dimmers. The dimmers and controller are shown in Figure VI-4. The X-, Y- and Z-axis stepper motors are operated by the host computer via the stepper controller, shown in Figure VI-5.
Fig. VI-4. MIDI Light Dimmers and Controller
20A Power Supply Stepper Drivers Stepper Controller

5A Power Supply

Fig. VI-5. Stepper Motor Drivers and Controller
STEALTH will operate in a pre-programmed mode if there is no sensor input arising from an action on the part of the viewer. However, phototransistor and infrared motion sensors and joysticks are provided to enable viewer interaction. The joysticks are mounted on a separate stand, along with a liquid crystal display screen that provides feedback to the viewer. They are shown in Figure VI-6.
Liquid Crystal Display (LCD) A

Z Joystick

X and Y Joystick with Pushbutton
Fig. VI-6. Joysticks and LCDA
Several phototransistor sensors are mounted on the front of the table, pointed toward a viewer standing at the joysticks. They are indicated in Figure VI-7, along with several other components.

Video Cameras

Y Stepper Motor

Phototransistor Sensors

Fig. VI-7. Phototransistor Sensor Location Much of the video processing equipment is located in an equipment rack. The host computer and stepper motor controller/drivers constitute another major
block of equipment, as does the audio processing equipment. Although the equipment rack is shown in Figure VI-8, the individual pieces of equipment remain to be identified and labeled.
Fig. VI-8. Video Processing Equipment Rack
STEALTH, like most of the other presentations, is evolving. A possible addition is one or two Islands, each of which includes a low-power laser and beam splitting apparatus. Just how the Islands will be used remains to be determined. One of the Islands is shown in Figure VI-9.

Beam Splitter Laser

Fig. VI-9. Island