Clear channel detector for binary digital data transmission syst

Details Clear channel detector for binary digital data transmission syst Clear channel detector for binary digital data transmission syst

1983-03-09

1984-12-18

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

370 89, 3408255, H04Q 900

Patent

active

044894201

ABSTRACT:
A clear channel detector for use in a binary digital data transmission system in which collisions are possible between simultaneously transmitting stations all connected to a common transmission medium. The detector receives the output from each of a pair of different binary symbol detectors in the station receiver. The voltage difference between the binary symbol detector outputs is amplified, and the resulting bipolar voltage is converted to an absolute amplitude. After further amplification, a threshold adjustment is provided at a trigger subcircuit having at least one output signal indicating the presence of a clear transmission channel which is not presently in use.

REFERENCES:
patent: 3619785 (1971-11-01), Farrow
patent: 3925732 (1975-12-01), Tanaka et al.
patent: 4199663 (1980-04-01), Herzog
patent: 4234952 (1980-11-01), Gable et al.
patent: 4375102 (1983-02-01), Van Deal
patent: 4403333 (1983-09-01), Gupta
patent: 4409593 (1983-10-01), Bose
patent: 4439856 (1984-03-01), Vlug
patent: 4442531 (1984-04-01), Gupta

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