Multi-mode digital enciphering system

Details Multi-mode digital enciphering system Multi-mode digital enciphering system

1975-04-14

1978-03-14

Birmiel, Howard A.

Telegraphy

Systems

Printing

178 58R, 178 691, H04L 902

Patent

active

040791882

ABSTRACT:
The specification discloses an electronic digital enciphering system which is selectively operable in a plurality of different modes. The system may be operated in an off-line mode for preparing enciphered message tapes prior to transmission via teleprinter message circuits. The system may also be operated in an on-line asynchronous mode wherein a sending station may asynchronously transmit enciphered data on-line to a remote receiving unit, synchronization being provided by the start/stop pulses of the individual digital characters. The system may also be operated in an on-line synchronous mode wherein a sending and a receiving unit are automatically synchronized in time by local self-contained clocks in order to bridge fades or interference in a transmission medium such as radio telegraph, or the like. The system may be utilized on either half-duplex or full-duplex communication channels.

REFERENCES:
patent: 2898402 (1959-08-01), Cory et al.
patent: 2993089 (1961-07-01), Negri
patent: 3156767 (1964-11-01), Van Duuren et al.
patent: 3809820 (1974-05-01), Sullivan
patent: 3878332 (1975-04-01), Morgan et al.
patent: 3937882 (1976-02-01), Bingham

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