Communications: electrical – Selective
Patent
1976-12-29
1978-11-07
Farley, Richard A.
Communications: electrical
Selective
340 1C, 343112PT, G01S 518, G01S 966
Patent
active
041248384
ABSTRACT:
The disclosure is directed to an apparatus for position determination in a data space, the position determination preferably being in the form of rectangular coordinates. First and second orthogonally oriented elongated microphones are provided. The microphones approximately define adjacent edges of a substantially rectangular data space. A passive movable element, such as a stylus or puck, is provided as being movable in the data space. Means are provided for periodically generating sound waves at a source position spaced from the movable element. Preferably, the source of sound waves is located such that the sound waves emanate from about the corner of the data space defined by the intersection of said adjacent edges. Timing means, coupled to the microphones and synchronized with the generation of the sound waves, are provided for measuring the transit times of the sound waves reflected off the movable element to the microphones. To obtain the position of the movable element in a desired coordinate system, computing means are employed to determine the positional coordinates of the movable element, such as in rectangular coordinates.
REFERENCES:
patent: 3653031 (1972-03-01), Hlady et al.
patent: 3838212 (1974-09-01), Whetstone et al.
patent: 4012588 (1977-03-01), Davis et al.
Farley Richard A.
Novack Martin
Science Accessories Corporation
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