US3922663A
Expired / Lapsed
US
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Seismic human footstep detector
Assignee: Honeywell Inc
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Filing: 1974-05-30
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Granted: 1975-11-25
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Expires: 1994-05-30
Abstract
Abstract The apparatus includes logic for examining the signature of the signal received from a seismic sensor, for measuring the duration of the disturbances and the time interval between successive disturbances and for determining, on basis of such information, whether the disturbances are or are not caused by human footsteps.
Inventors
- 👤 Roger A Lubke
- 👤 Charles P Varecka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:39
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654; G08B13/1663
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A seismic apparatus for detecting and identifying seismic disturbances caused by human footsteps, said apparatus comprising: a seismic sensor for detecting seismic disturbances, and for providing at its output electrical pulses corresponding to said seismic disturbances; a first timing means for receiving said pulses from said seismic sensor and providing a signal at its output whenever the duration of a pulse does not exceed a first predetermined time period; a second timing means for receiving said pulses from said seismic sensor and providing a signal at its output whenever the time separation between successive pulses does not exceed a second predetermined time period; a third timing means for receiving said pulses from said seismic sensor and providing a signal at its output whenever the time separation between successive pulses is greater than a third predetermined time period; and signal processing means for receiving signals from said first, second, and third timing means, and, in response thereto, providing at its output a signal representing a valid footstep.
Claim 2
Dependent Claim
166 words
A seismic apparatus for detecting and identifying seismic disturbances caused by human footsteps, said apparatus comprising: a seismic sensor for detecting seismic disturbances, and for providing at its output electrical pulses corresponding to said seismic disturbances; a first timing means for receiving said pulses from said seismic sensor and providing a signal at its output whenever the duration of a pulse does not exceed a first predetermined time period; a second timing means for receiving said pulses from said seismic sensor and providing a signal at its output whenever the time separation between successive pulses does not exceed a second predetermined time period; a third timing means for receiving said pulses from said seismic sensor and providing a signal at its output whenever the time separation between successive pulses is greater than a third predetermined time period; and signal processing means for receiving signals from said first, second, and third timing means, and, in response thereto, providing at its output a signal representing a valid footstep.
Claim 3
Dependent Claim
12 words
Apparatus according to claim 1, wherein said seismic sensor is a geophone.
Claim 4
Dependent Claim
31 words
Apparatus according to claim 1 wherein a footstep counter is provided for accumulating signals from said first timing means and providing an output upon accumulation of a predetermined number of signals.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 1 wherein said first predetermined time period is 250 milliseconds, said second predetermined time period is 320 milliseconds, and said third predetermined time period is 1,6 seconds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |