×

Alerting device and system for abnormal situations

  • US 5,572,201 A
  • Filed: 08/05/1994
  • Issued: 11/05/1996
  • Est. Priority Date: 08/05/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A system for broadcasting an emergency warning throughout an area about a site, the system comprising:

  • a source at the site of an audible or visual warning signal detectable by at least one of the human senses;

    a transmitter at the site for broadcasting an electromagnetic warning signal within a tunable bandwidth of a standard radio receiver for receiving commercial broadcasts, with at least part of the electromagnetic warning signal encoded in an RDS compatible format;

    a power amplifier within the transmitter whose power rating provides an effective range of the electromagnetic warning signal that complements an effective range of the audible or visual signal and is approximately coextensive therewith; and

    , means for detecting the electromagnetic warning signal within is effective range and in response thereto tuning the receiver to a carrier frequency of the electromagnetic warning signal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×