Personal monitoring system

• US 20020063626A1
• Filed: 05/18/2001
• Published: 05/30/2002
• Est. Priority Date: 07/31/1998
• Status: Abandoned Application

• Current Assignee: Beryl E. Pitzer, John O. Ghazarian
• Original Assignee: Beryl E. Pitzer, John O. Ghazarian
• Inventors: Pitzer, Beryl E., Ghazarian, John O.
• Application Number:
  US09/861,099
• Publication Number:
  US 20020063626A1
• Time in Patent Office: Days
• US Class Current: 340/573.1
• CPC Class Codes: B63C 9/0005 by means of alarm devices for persons falling into the water, e.g. by signalling, by controlling the propulsion or manoeuvring means of the boat alarms responsive to presence of persons in a body of water in general G08B21/08
• CPC Class Codes: G08B 21/22 responsive to presence or absence of persons

Abstract

A body worn transmitter periodically transmits a coded rf signal from a rolling code generator, which is received by a base unit at the location where a person is confined, which base unit has a rolling code generator synchronized to produce the same random code signal for comparison. If proper coded signals are not received, a report is sent via telephone to a remote monitoring station. The body worn transmitter is designed to detect and defeat attempts at removal.

The body worn transmitter is also used to detect the presence of a person at a particular location.

By programming the time of rf transmissions, a large number of body worn transmitters can be monitored at a given location.

Claims

1. A monitoring system including a body worn transmitter periodically transmitting a rf signal;

a base unit including a rf receiver receiving said periodic transmissions from said body worn rf transmitter;

a rolling code signal generator associated with said body worn transmitter, said periodic rf signal transmissions includes a corresponding coded signal changing with each successive periodic transmission;

said base unit also including a corresponding rolling code signal generator identical to said rolling code generator included in said body worn transmitter;

said body worn signal generator and said base unit signal generator synchronized to produce an identical random code signals successively, said base unit including means for comparing the coded signal transmitted by said body worn transmitter with the coded signal generated by said based unit signal generator and generating a remote notification signal whenever there is a continued absence of a receipt of a transmission by said base unit of a coded rf signal corresponding to said random code generator signals of said base unit and said body worn transmitter.

2. A monitoring system comprising a series of rf transmitters to be monitored;

a common base unit including a rf receiver for receiving periodic transmissions from each of said monitor transmitters;

said base unit including a scanner means organizing a monitoring time period into a series of time slots and said base unit further including means for activating each of said monitor transmitters in an assigned time slot whereby each of said monitor transmitters transmits only in a unique time slot whereby said base unit receives only a single transmission at a time.