Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent
1985-06-24
1987-01-27
Swann, III, Glen R.
Communications, electrical: acoustic wave systems and devices
Echo systems
Presence or movement only detection
340552, 342 5, G08B 1316
Patent
active
046399020
ABSTRACT:
An intrusion detector is configured to transmit signal(s) of a very short ration and then process the returned signal(s) reflected from various surfaces and objects within the propagation path in a room to be secured. The return signal(s) is a succession of peaks whose return times represent the location of respective objects. As configured, the intrusion detector apparatus includes, inter alia, a microprocessor that stores processed facsimiles of the return signal(s) for an unoccupied room and continually makes comparisons with subsequent returned signal(s). When the returned signal(s) changes, as a result of an unauthorized entry into the room, for example, a visual and/or audible alarm indication is produced.
REFERENCES:
patent: 4242743 (1980-12-01), Salem
patent: 4382291 (1983-05-01), Nakauchi
patent: 4499564 (1985-02-01), Sirai
patent: 4512000 (1985-04-01), Masako
Leverance Robert A.
Longas Socrates A.
Swann III Glen R.
The United States of America as represented by the Secretary of
Walden Kenneth E.
Wein Frederick A.
Wynn John G.
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