Method and apparatus for uniquely encoding channels in a digital

Details Method and apparatus for uniquely encoding channels in a digital Method and apparatus for uniquely encoding channels in a digital

1975-03-14

1976-11-02

Safourek, Benedict V.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 41, 3401461BE, 340147SC, H03K 1332

Patent

active

039900096

ABSTRACT:
In a digital transmission system of the type which employs cross-polarized radio channels, the failure of a transmitter associated with a particular channel can cause an undesired signal cross-over into the receiver of the failed channel. According to the instant invention, each channel in the system is uniquely encoded by a combination of bitstream inversion and bitstream delay at the head end of the system. Thus, if a signal crossover occurs an excessive number of parity violations are detected in the failed channel and a switch to a protection channel is requested.

REFERENCES:
patent: 3069482 (1963-07-01), Frank et al.
patent: 3128342 (1964-04-01), Baker
patent: 3128343 (1964-04-01), Baker
patent: 3500207 (1970-03-01), Ruthroff
patent: 3646516 (1972-02-01), Flinders et al.
patent: 3665395 (1972-05-01), Bochmann
patent: 3665430 (1972-05-01), Hinrichs et al.

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