Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With electromagnetic wave
Reexamination Certificate
2007-09-17
2010-11-09
Tarcza, Thomas H (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With electromagnetic wave
Reexamination Certificate
active
07830750
ABSTRACT:
A system and method for calibrating an acoustic detector. The method includes the steps of simultaneously transmitting an acoustic signal and an electromagnetic signal to an acoustic detector, receiving both signals, calculating a timing difference between the reception of the acoustic signal and electromagnetic signal, and setting a first time threshold used to determine if a glass panel is broken using the calculated difference and storing the first time threshold. A sensitivity level is also set based upon the determined timing difference. A unique key signature in the acoustic signal and electromagnetic signal is detected and matched with a stored signature to determine whether the signals are from a calibration signal. The timing difference is only calculated if both signals are calibration signals.
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patent: 5524099 (1996-06-01), Rickman et al.
patent: 7057497 (2006-06-01), Sakai
patent: 2005/0264413 (2005-12-01), Eskildsen
Honeywell International , Inc.
Husch Blackwell Sanders Welsh & Katz
Ratcliffe Luke D
Tarcza Thomas H
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