Emergency civil defense alarm and communications systems

Details Emergency civil defense alarm and communications systems Emergency civil defense alarm and communications systems

1974-10-07

1976-08-17

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

325308, 325 57, 178DIG13, H04N 718

Patent

active

039755835

ABSTRACT:
In a cable television distribution system, an emergency pre-empt system is located at a transmission station separate from the distribution station. This pre-empt system contains circuitry for interrupting the normal distribution of cable television signals and for enabling an emergency operator to present desired audio and video information to the viewers of the receivers serviced by the distribution system irrespective of the channel to which a receiver may be tuned.

REFERENCES:
patent: 3130396 (1964-04-01), Hughes et al.
patent: 3521168 (1970-07-01), Kaiser et al.
patent: 3761914 (1973-09-01), Hardy et al.
patent: 3860746 (1975-01-01), Takeuchi
patent: 3876940 (1975-04-01), Wickord et al.

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