Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1982-09-30
1985-03-19
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367108, 367907, G01S 1504
Patent
active
045063540
ABSTRACT:
A system measures the (x, y) coordinates of a target, for example, a pointed finger on a flat surface such as a rectangular plate. A pair of ultrasonic transducers are placed on the plate so that one transducer is located at each of the two left corners of the plate or at each of the two top corners of the plate. The transducers transmit short ultrasonic pulses which are reflected as echos off the target and then received by the transducers. The time elapsed between the transmitting of each pulse and receiving its echo is converted into distances between the transducers and the target, which distances are then converted into the target's (x, y) coordinates.
The system is designed to clamp onto a number of flat surfaces, thereby allowing the system to be used with printed representations of keyboards, graphs, CRT monitors and standard television screens. The system is interfaced with any of a variety of computers and provides a signal representative of the location of the target to the computer.
The system is also designed so that it can be placed inside any new or existing frame around the flat surface.
REFERENCES:
patent: 3653031 (1972-03-01), Hlady et al.
patent: 4124838 (1978-11-01), Kiss
Farley Richard A.
Position Orientation Systems, Ltd.
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