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.

What is claimed is:  
     
       1. A method of generating an alert signal comprising the steps of: 
       generating a first signal when an unauthorized subject is in a first region within seven feet of a monitored passageway;  
       generating a second signal upon satisfaction of a second condition that indicates the likelihood of the subject passing through the passageway;  
       displaying a first indication if the first signal is present and a second indication if the second condition occurs;  
       the step of generating a first signal including the step of transmitting a signal from the subject to a receiver.  
     
     
       2. A method in accordance with claim  1  in which the step of generating the second signal includes the step of generating a second signal whenever a door to the passageway is open. 
     
     
       3. A method in accordance with claim  1  in which the step of generating the second signal includes the step of generating a second signal whenever an infrared detector senses a person at the passageway. 
     
     
       4. A method in accordance with claim  1  in which the step of generating second signal includes the step of generating the second signal whenever a person is sensed by a pressure pad in a first locality in front of the passageway. 
     
     
       5. A method in accordance with claim  1  in which the step of generating a first signal includes the step of transmitting a signal from a location adjacent to the passageway. 
     
     
       6. A security system comprising: 
       first means for generating a first signal when an unauthorized subject is within seven feet of a passageway;  
       second means for generating a second signal upon satisfaction of a second condition that indicates the likelihood of the subject passing through the passageway; and  
       third means for displaying a first indication if the first signal is generated and for displaying a second indication upon the generation of the second signal;  
       said first means for generating a first signal including means for transmitting a signal from the subject to a receiver.  
     
     
       7. A security system in accordance with claim  6  in which the second means for generating a second signal includes means for generating a second signal whenever a door to the passageway is open. 
     
     
       8. A security system in accordance with claim  6  in which the second means comprises means for generating a second signal whenever an infrared detector senses a person at the passageway.