Method and apparatus to detect an external source

Details Method and apparatus to detect an external source Method and apparatus to detect an external source

G - Physics

08

B

G08B 23/00 (2006.01) G01V 3/10 (2006.01) G08B 13/08 (2006.01) G08B 13/24 (2006.01)

Patent

CA 2497220

A method and apparatus to detect an external source are described. The apparatus comprises an oscillation circuit to generate an oscillation signal using a marker. The oscillation circuit modifies a characteristic of the oscillation signal in response to an external source. The circuit also includes a sensor to receive the oscillation signal, detect the modification, and generate a detect output signal in accordance with the detection. The method comprises generating an oscillation signal using a marker; modifying a characteristic of said oscillation signal in response to an external source; detecting said characteristic modification; and generating a detect output signal in accordance with said detection.

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