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US4586031A
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Infra-sonic detector, and alarms including same
Assignee: GUGLIELMETTI VINCENT IMPASSE DES VALLIERES VILLA 1'ESCAPADE 06800 CAGNES SUR MER
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Filing: 1983-09-08
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Granted: 1986-04-29
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Expires: 2003-09-08
Abstract
Abstract A volumetric infra-sonic pick-up may be used in various combinations to form an infra-sonic or low-frequency alarm and intrusion detector. The detection device for alarm, surveillance and/or monitoring comprises an infra-sonic pick-up (1) below the sonic frequency range. The infra-sonic pick-up (1) comprises means acting as a pressure or pressure variation pick-up (2), an amplifier (3), and a filter which eliminates the audio or higher frequency signals. The pressure pick-up (2) is a microphone.
Inventors
- 👤 Raymond Grinneiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:50
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/20; G08B13/16; G08B13/1654; G08B13/1681
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A passive intrusion detector and alarm device comprising in electrical series: an infrasonic detector (1) comprising: a pressure pick-up (2) adapted for sensing pressure variations occurring in the atmosphere of the space to be monitored, and producing a corresponding electric pressure signal; amplifier means (3) for amplifying said pressure signal; low-pass filter means (4) for retaining only infrasonic signals from the signals delivered by said amplifier means; threshold means (6) for comparing the signal from said low-pass filter means to a fixed reference thereby delivering a trigger signal; and alarm means (14) activated by said trigger signal.
Claim 2
Dependent Claim
97 words
A passive intrusion detector and alarm device comprising in electrical series: an infrasonic detector (1) comprising: a pressure pick-up (2) adapted for sensing pressure variations occurring in the atmosphere of the space to be monitored, and producing a corresponding electric pressure signal; amplifier means (3) for amplifying said pressure signal; low-pass filter means (4) for retaining only infrasonic signals from the signals delivered by said amplifier means; threshold means (6) for comparing the signal from said low-pass filter means to a fixed reference thereby delivering a trigger signal; and alarm means (14) activated by said trigger signal.
Claim 3
Dependent Claim
20 words
The device of claim 1, in which the low-pass filter means is adapted to retain only signals below 20 Hz.
Claim 4
Dependent Claim
20 words
The device of claim 2, in which the low-pass filter means is adapted to retain only signals below 1.8 Hz.
Claim 5
Dependent Claim
19 words
The device of claim 1, including sensitivity adjusting means (7) for setting said fixed reference of said threshold means.
Claim 6
Dependent Claim
20 words
The device of claim 1, in which the sensitivity of said pressure pick-up is of the order of 0.1 μbar.
Claim 7
Dependent Claim
14 words
The device of claim 1, in which said pressure pick-up is a microphonic pick-up.
Claim 8
Dependent Claim
14 words
The device of claim 6, in which said microphonic pick-up is an electret microphone.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |