Alert condition system usable for personnel monitoring

Abstract

To generate an alert signal indicating that an unauthorized subject is in a first region within seven feet of a passageway, a radio transmitter is worn by the subject and received by a receiver at the passageway. A second signal is generated upon satisfaction of a second condition, such as an open door at the passageway, which second signal indicates the likelihood of the subject passing through the passageway. A first display indicates if the first signal is present and a second signal if the second condition occurs.

Description

BACKGROUND OF THE INVENTIONThis invention relates to apparatuses and methods for monitoring personnel.In one class of personnel monitoring system, a detector is positioned near exits or in passageways to determine when a person or an object is moving through the passageway or door. At that time, a signal is transmitted to a monitoring station indicating that a person or object is going through the door. Among other uses, such systems are used as security systems to determine if unauthorized patients are leaving a nursing home or the like. One such system is disclosed in U.S. Pat. No. 4,095,214.In some such systems, a first signal is generated when the patient enters a first region. If a second condition occurs, such as the opening of a door, an alarm signal is given. A system of this type is disclosed in U.S. Pat. No. 4,682,155. In some of the known systems, a person carries an active device such as a transmitter, and an others, the person carries a passive device which receives sig...

AI Technical Summary

Benefits of technology

From the above description, it can be understood that the alert system of this invention has several advantages, such as: (1) it provides a warning that will cause persons monitoring a passageway to be alert to a possible exit of an unauthorized person or object; (2) it can compensat

Problems solved by technology

The prior art personnel monitoring system of this class may generate a signal when the personnel being monitored are near a passageway but do not provide an alarm or warning unless a monitored person gives further indications of trying to go through the passageway.

The prior art personnel monitoring systems have several disadvantages, such as for example: (1) they do not provide advanced warning that a monitored person may be about to go through the passageway; (2) the signals may be given at a time when the central station doing the monitoring is unattended, thus permitting the persons to proceed a substantial distance before it is detected that they have left: (3) the systems can be defeated by a careful perso

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