Telegraphy – Systems – Printing
Patent
1977-09-09
1979-09-25
Birmiel, Howard A.
Telegraphy
Systems
Printing
178 691, 364728, H04L 900
Patent
active
041692128
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.
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patent: 3402265 (1968-09-01), Couvillon, Jr.
patent: 3463911 (1969-08-01), Dupraz et al.
patent: 3509277 (1970-04-01), Moore et al.
patent: 3566268 (1971-02-01), Webb
patent: 3586776 (1971-06-01), Salava
patent: 3648237 (1972-03-01), Frey, Jr. et al.
patent: 3654390 (1972-04-01), Puckette
patent: 3723878 (1973-03-01), Miller
patent: 3823266 (1974-07-01), Van Elk et al.
Kinch, Jr Frederick A.
Morgan Barrie O.
Birmiel Howard A.
Datotek, Inc.
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