Telegraphy – Systems – Printing
Patent
1974-10-15
1976-11-23
Claffy, Kathleen H.
Telegraphy
Systems
Printing
178 68, H04L 514
Patent
active
039938670
ABSTRACT:
A driver circuit that permits full duplex transmission of digital data on a single signal line includes means for enabling a receiver of a station having a transmitter and a receiver to ignore outgoing digital signals from the transmitter of the same station and receive incoming signals. The circuit includes means that combine the incoming and outgoing digital signals in the signal line to form a composite multi-level signal which shifts between predetermined amplitude levels and means that recover the incoming digital signals from the composite signal. An offset bias level is added within the receiver signal processing to the transmitter pulse level to reduce noise susceptibility. Using such a circuit a full duplex transmission system of a plurality of stations connected to a common single signal line is provided. Such a system can be operated in a broadcast mode wherein one station can transmit signals to the remainder of stations.
REFERENCES:
patent: 3369229 (1968-02-01), Dorros
patent: 3519743 (1970-07-01), Herter
patent: 3531594 (1970-09-01), Dickerson
patent: 3573370 (1969-03-01), Blauert
patent: 3824344 (1974-07-01), James et al.
Isberg, Ranson, "D. C. Duplexor," IBM T.D.B., June 1962.
Claffy Kathleen H.
Kemeny E. S.
Motorola Inc.
Parsons Eugene A.
Weiss Harry M.
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