Telegraphy – Systems – Printing
Patent
1975-02-18
1976-03-09
Claffy, Kathleen H.
Telegraphy
Systems
Printing
179 15A, H04L 514
Patent
active
039432840
ABSTRACT:
A communication system using a single transmission line for the simultaneous bidirectional transmission and reception of a plurality of asynchronous digital data signals. At each end of the transmission line, transmitting means are provided for converting a plurality of individual digital data signals into a multi-level signal. The system permits simultaneous bidirectional transmission of these multi-level signals without requiring the incorporation of a clocking signal into the transmitted signals for decoding purposes. Multi-threshold receivers at each end of the transmission line provide for unclocked decoding of a received multi-level signal, the resulting decoded signals being applied to a pulse discriminating filter for removing spurious pulses which may be introduced during the unclocked decoding as a result of phase shift errors in the signals being decoded. A dynamically variable biasing circuit controls the biasing of the receivers in accordance with the instantaneous value of any multi-level signal being simultaneously transmitted from the same end as the receivers so as to cause the receiver thresholds to appear substantially constant to a received multi-level signal, thereby permitting simultaneous bidirectional transmission and reception along the single transmission line.
REFERENCES:
patent: 3340363 (1967-09-01), Bour et al.
patent: 3519743 (1970-07-01), Herter
patent: 3801748 (1974-04-01), Cotten
patent: 3803355 (1974-04-01), Fredler
patent: 3832494 (1974-08-01), Seim et al.
RCA Institutes, Inc. "Digital Communications", 3rd Ed., 1968, p. 1.7.
Thrasher, P., "Time Multiplex Filter", IBM Tech. Disclosure Bulletin, Vol. 6, No. 1, June 1963.
Burroughs Corporation
Cass Nathan
Claffy Kathleen H.
Kemeny E. S.
Penn William B.
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