APPARATUS AND METHOD FOR CALIBRATING AN ACOUSTIC DETECTION SYSTEM
First Claim
1. A method of calibrating an acoustic detector comprising the steps of:
- transmitting simultaneously an acoustic signal and an electromagnetic signal;
receiving the electromagnetic signal at an acoustic detector;
receiving the acoustic signal at an acoustic detector;
calculating a timing difference between the reception of the acoustic signal and electromagnetic signal; and
storing the calculated timing difference as a first time threshold for determining if a glass panel is broken.
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Accused Products
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.
7 Citations
22 Claims
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1. A method of calibrating an acoustic detector comprising the steps of:
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transmitting simultaneously an acoustic signal and an electromagnetic signal; receiving the electromagnetic signal at an acoustic detector; receiving the acoustic signal at an acoustic detector; calculating a timing difference between the reception of the acoustic signal and electromagnetic signal; and storing the calculated timing difference as a first time threshold for determining if a glass panel is broken. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 22)
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9. An calibration device for calibrating an acoustic detection system comprising:
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a. an acoustic signal generating section for generating an acoustic signal having a unique signature corresponding to the calibration device; b. a speaker for transmitting said acoustic signal to an acoustic detector; c. a signal generating section for generating a electromagnetic signal having a second unique signature corresponding to the calibration device; and d. a transmitter for simultaneously transmitting the electromagnetic signal to the acoustic detector. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An acoustic detector comprising:
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a sensor for detecting an acoustic signal; a receiver for detecting a electromagnetic signal; a timer for recording a reception time of the electromagnetic signal and a reception time of the acoustic signal; a calculating section for determining a timing difference between the reception times of the electromagnetic signal and the acoustic signal; and a controller for storing the timing difference as a first time threshold for determining if a glass panel is broken. - View Dependent Claims (16, 17, 18, 19)
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20. A system for calibrating an acoustic detector comprising:
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an impact sensor for transmitting a signal to an acoustic detector; and a calibration device for simultaneously emitting an acoustic signal to the acoustic detector, wherein said acoustic detector determines a time of reception of the signal and the acoustic signal, calculates a difference in the reception time of the signal and the acoustic signal and sets the difference as a first time threshold for determining if a glass panel is broken.
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21. The system for calibrating an acoustic detector, wherein said acoustic detector determines a distance from a window to the acoustic detector based upon the difference and sets a sensitivity level for the acoustic detector based upon the distance.
Specification