Patent ID: 6032035
Filing Date: 2000-02-29
Classification: G08B

Abstract:
An emergency monitoring and alerting system comprising: a plurality of high frequency, amplitude modulation transmitters strategically placed within an area to be monitored each having a stored location code representing a specific location of said transmitter and transmitting means for transmitting said code via a high frequency am spread spectrum frequency hopping technique; a portable transmitter/receiver unit for use by a user of the system, said transmitter/receiver unit having a high frequency am receiver to periodically detect, decode and store said location code transmitted thereto by said transmitter; processing means including storage means to store a unique identity code respecting said transmitter/receiver unit, said processing means also having means to attach said location code to said identity code and to transmit the combined code in response to a command by said user, said transmitter/receiver unit having timing means to test for coded information on a periodic basis and to defer testing for a set interval upon receipt of said location code; and a local receiver for receiving said combined code and determining the identity and the location of said unit and if said code represents a location within a preset group of locations forwarding said data to a central monitoring station, otherwise ignoring said code.