Motor vehicle security sensor system
First Claim
1. A security sensor for a motor vehicle comprising:
- accelerometer means for monitoring vibrations within said vehicle and for generating force signals in response to said vibrations;
microphone means for monitoring acoustic energy within an interior passenger compartment of said vehicle and generating acoustic signals representative of said acoustic energy;
first acoustic circuit means coupled to said microphone means for sensing acoustic signals representative of acoustic energy within a first narrow low frequency band and generating low frequency acoustic energy present signals in response thereto;
second acoustic circuit means coupled to said microphone means for sensing acoustic signals representative of acoustic energy within a second high frequency band and generating high frequency acoustic energy present signals in response thereto; and
processor means coupled to said accelerometer means, said microphone means, said first acoustic circuit means and said second acoustic circuit means for receiving and processing said force signals, said acoustic signals, said low frequency acoustic energy present signals and said high frequency acoustic energy present signals to detect glass breakage within said vehicle and generate an alarm signal in response to detected glass breakage, said low frequency acoustic energy present signals and said high frequency acoustic energy present signals being sampled in response to force signals exceeding a defined noise level or acoustic signals exceeding a defined sound level.
2 Assignments
0 Petitions
Accused Products
Abstract
Sound, vibration and motion are sensed within a motor vehicle to detect glass breakage and unauthorized intrusion into the interior or passenger compartment of the vehicle. Sound and vibration sensing are used to detect glass breakage with motion detection by means of radar or microwaves being utilized for intrusion detection to provide reliable recurring entry detection. The system may be operated to activate the motion sensing only after glass breakage is detected to permit persons and pets to occupy a motor vehicle having a security sensor system which is fully armed. Numerical values are assigned to specific physical sounds and vibrations with the resulting totals being compared to a threshold to determine whether glass breakage has occurred.
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Citations
15 Claims
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1. A security sensor for a motor vehicle comprising:
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accelerometer means for monitoring vibrations within said vehicle and for generating force signals in response to said vibrations; microphone means for monitoring acoustic energy within an interior passenger compartment of said vehicle and generating acoustic signals representative of said acoustic energy; first acoustic circuit means coupled to said microphone means for sensing acoustic signals representative of acoustic energy within a first narrow low frequency band and generating low frequency acoustic energy present signals in response thereto; second acoustic circuit means coupled to said microphone means for sensing acoustic signals representative of acoustic energy within a second high frequency band and generating high frequency acoustic energy present signals in response thereto; and processor means coupled to said accelerometer means, said microphone means, said first acoustic circuit means and said second acoustic circuit means for receiving and processing said force signals, said acoustic signals, said low frequency acoustic energy present signals and said high frequency acoustic energy present signals to detect glass breakage within said vehicle and generate an alarm signal in response to detected glass breakage, said low frequency acoustic energy present signals and said high frequency acoustic energy present signals being sampled in response to force signals exceeding a defined noise level or acoustic signals exceeding a defined sound level. - View Dependent Claims (2, 3)
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4. A method of operating a motor vehicle security system comprising the steps of:
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(a) generating force signals in response to vibrations within said vehicle; (b) generating low frequency acoustic energy signals in response to low frequency acoustic energy within said vehicle; (c) generating high frequency acoustic energy signals in response to high frequency acoustic energy within said vehicle; (d) sampling said low frequency acoustic energy signals and said high frequency acoustic energy signals in response to one of said force signals exceeding a predetermined noise level to determine a low frequency acoustic energy sample and a high frequency acoustic energy sample; (e) assigning preset analysis values to said force signals; (f) assigning preset analysis values to said low frequency acoustic energy sample; (g) assigning preset analysis values to said high frequency acoustic energy sample; (h) summing said preset analysis values assigned to said force signals, to said low frequency acoustic energy sample and to said high frequency acoustic energy sample to arrive at a sum; and (i) utilizing the sum of said preset analysis values to determine whether to activate an alarm signal indicating glass breakage within said vehicle. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A method of sensing intrusion into a motor vehicle comprising the steps of:
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(a) detecting vibrations within said vehicle; (b) sampling acoustic energy within a first narrow low frequency band within said vehicle if detected vibrations exceed a noise level to determine a low frequency band acoustic energy sample; (c) sampling acoustic energy within a second high frequency band within said vehicle if detecting vibrations exceed said noise level to determine a high frequency band acoustic energy sample; (d) recording detected vibrations within said vehicle over a first selected time period after detecting vibrations within said vehicle exceeding said noise level; (e) comparing vibrations recorded within said first selected time period to a band defined by a maximum vibration signal level and a minimum vibration signal level; (f) sampling vibrations within said vehicle over a second selected time period if at least one of said vibrations recorded within said first selected time period is above said band or at least one of said vibrations recorded within said first selected time period is below said band; and (g) evaluating said low and high frequency band acoustic energy samples, said recorded vibrations and said sampled vibrations to determine whether glass has been broken within said vehicle. - View Dependent Claims (13, 14, 15)
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Specification