Transmission path tester for broadcasting

Details Transmission path tester for broadcasting Transmission path tester for broadcasting

1989-02-07

1991-09-03

Strecker, Gerard R.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 67, 455 70, 455228, 340902, H04B 100, H04B 116, H04B 1700

Patent

active

050461273

ABSTRACT:
A warning broadcast system features control signal means, preferably digital, for confirming transmission path integrity prior to broadcast of a spoken warning message. A radio receiver (1) in an alarm center has an auxiliary carrier reception stage (4) which feeds a decoder (5). A coincidence circuit (6) has a first input (7) connected to the decoder output for inputting the received broadcast control signal and a second input (8) for inputting a directly-coupled control signal via a delay line (9) from the control signal generator (10) of the alarm center. When the control signals at the imputs (7, 8) of the coincidence circuit (6) coincide, an output signal (14) actuates a release (15) for the spoken warning message. If a plurality of transmitters (3) having different frequencies are networked, separate receivers (1,1', . . . ) set to the respective frequencies can feed their respective outputs (14, 14', . . . ) to an AND-gate (16) which triggers release (15).

REFERENCES:
patent: 4334320 (1982-06-01), Liman
patent: 4499603 (1985-02-01), Eilers
patent: 4511887 (1985-04-01), Fiore
Blaupunkt Public Information & Notification System, Mar. 1987.

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