Service channel signal transmission system

Details Service channel signal transmission system Service channel signal transmission system

1983-02-01

1984-09-11

Ng, Jin F.

Telecommunications

Audience survey or program distribution use accounting

455 3, 455 22, 455 21, 375 3, H04B 336, H04B 714

Patent

active

044714912

ABSTRACT:
A service channel signal transmission system in which a service channel signal is constantly fed to at least two radio channels in parallel. Each intermediate repeater station has a service channel demodulator which is constantly connected to either one of the radio channels. A combining and switching circuit automatically switches over the service channel demodulation to the other radio channel in response to an alarm output which indicates an abnormality in a received signal at a receiver associated with the one radio channel. The service channel is completely switched from one to the other without resorting to line switchover control signals from terminal stations.

REFERENCES:
patent: 3204204 (1965-08-01), Buxton et al.
patent: 3681694 (1972-08-01), Sarati
patent: 4242756 (1980-12-01), Huffman et al.

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