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Radio with silent and audible alerts

  • US 6,252,515 B1
  • Filed: 03/31/1994
  • Issued: 06/26/2001
  • Est. Priority Date: 01/22/1992
  • Status: Expired due to Term
First Claim
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1. A radio for communicating radio frequency (RF) call signals comprising:

  • an antenna for receiving a first RF call signal and transmitting a second RF call signal;

    a transmitter coupled to the antenna for generating the second RF call signal;

    a receiver coupled to the antenna for receiving the first RF call signal;

    a first generator for periodically generating, when enabled, a silent alert for a first predetermined number of cycles, wherein each cycle of the first predetermined number of cycles includes a first time period when the silent alert is generated followed by a second time period when the silent alert is not generated;

    a second generator for periodically generating, when enabled, an audible alert for a second predetermined number of cycles, wherein each cycle of the second predetermined number of cycles includes a first time period when the audible alert is generated followed by a second time period when the audible alert is not generated; and

    a processor coupled to the receiver for enabling the first generator when the first RF call signal is received, and, after at least one of the first predetermined number of cycles, enabling the second generator.

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