Emergency alert system signal handling method and apparatus

Details Emergency alert system signal handling method and apparatus Emergency alert system signal handling method and apparatus

1997-04-29

2000-02-01

Lee, Michael H.

Television

Special applications

Manufacturing

348705, 348 6, 307113, H04N 716

Patent

active

060209135

ABSTRACT:
A communication system includes 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 supplies power to the relay to place the relay alternately in the first and second states. The system further comprises first and second sources of program material to be selectively and alternately transmitted in the channel. The first and second sources of program material are characterized by at least one program material frequency. The first signal input port of the relay is coupled to the first source of program material. The signal output port of the relay is coupled to the transmission channel. A first inductance is provided for coupling the power supply to the operating power port. The relay includes a second inductance coupled across the power port for controlling the relay's state. First and second capacitances are provided for coupling the second source of program material to the second signal input port.

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