ECHOVISION FEATURES

INTELLIGENT AUDIBLE ALARM:

The ECHOVISION products utilize an audible warning signal that alerts the
operator to the presence of an obstacle in the monitored zone. An audible warning
leaves the operator's eyes free to do normal surveillance of his surroundings
unencumbered by a requirement to locate, read and interpret a visual display. The
audible signal is designed to intuitively represent the location of an object in the
monitored zones. For example, in the Echovision rear system the monitored area is
divided into outer and inner zones. In the outer zone the signal starts as a lower
pitched pulsed tone whose pitch rate increases as the object gets closer to the
vehicle. As the object enters the inner zone, the audible warning becomes an
alternating high/low tone at approximately 3 feet from the sensor. The inner zone
becomes, in effect, an electronic bumper

AUTOMATIC ACTIVATION:

The ECHOVISION products are automatically activated, requiring no
operator intervention. They only operate when they are needed. The rear system is
activated when the vehicle is placed in reverse gear.

SYSTEM VERIFICATION:

The ECHOVISION products perform a critical self-test that includes the
entire transmitter/receiver/computer and audio system. If a fault is detected, a red
light warns the operator of a system malfunction. U.S. Patents 5,160,927 and
5,235,315 have been awarded for the methods of self-test used in the ECHOVISION
products.

SMART PROGRAMS:

The signal processing in the ECHOVISION Products is accomplished with a
microprocessor. Thus we can use the microprocessor program to better tailor the
response of the system to the operator's needs and specifically to eliminate certain
responses that could be distracting to the operator. By utilizing a unique ultrasonic
beam focusing method and specialized software, allows the detection scheme to have
enhanced signal discrimination eliminating the chance of false alarms.

FLEXIBILITY:

The ECHOVISION system is designed with microprocessor based circuitry
and modular construction giving us the flexibility to customize the product to the
unique requirements of large fleets. The main product options are discussed below.

MAXIMUM RANGE-- The ECHOVISION system determines range by
measuring the elapsed time between the emission of a transmitter pulse and the
detection by the receiver of that pulse as it is reflected from the obstacle. We can set
a range window in our microprocessor program that accepts only pulses whose
elapsed time indicates that they were reflected from an object within our desired
range. Thus any practical maximum range can be selected for the system by putting
the corresponding number in the program when the system is built. The typical
maximum range for a back system is 10 feet.