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Emergency alert system signal handling method and apparatus

  • US 6,020,913 A
  • Filed: 04/29/1997
  • Issued: 02/01/2000
  • Est. Priority Date: 04/29/1997
  • Status: Expired due to Fees
First Claim
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1. A communication system including a transmission channel, a relay having first and second states, an operating power port, a first signal input port, a second signal input port and a signal output port, a power supply for supplying power to the relay to place the relay alternately in the first and second states, first and second sources of program material to be selectively and alternately transmitted in the channel, the first and second sources of program material characterized by at least one program material frequency, the first signal input port of the relay coupled to the first source of program material, the signal output port of the relay coupled to the transmission channel, a first inductance for coupling the power supply to the operating power port, the relay including a second inductance for controlling the relay state, and first and second capacitances for coupling the second source of program material to the second signal input port.

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