Pulse or digital communications – Repeaters – Testing
Patent
1987-07-21
1989-02-21
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 54, 375 67, 375 85, 329104, H04L 2718
Patent
active
048072516
ABSTRACT:
A modem system is disclosed which has an improved reliability of detection of PSK data using a simple signal delay detection scheme. A transmission signal is produced which has a phase reference portion provided at at least one of the front and rear portions of a time slot. In a first half of the remaining portion of the time slot the phase of the transmission signal changes stepwise in a first predetermined direction for a "mark" state while in a second half of the remaining portion it changes stepwise back to the reference value. For a "space" state the phase changes stepwise in a second predetermined direction, opposite the first, in the first half of the remaining portion and then in the second half it changes stepwise back to the reference value. In a second aspect of the invention only one of the two digital states causes a corresponding phase change while for the other state the transmission signal retains the phase reference value throughout the time slot.
REFERENCES:
patent: 3032745 (1962-05-01), Hamer
patent: 3242262 (1966-03-01), Melas et al.
patent: 3419804 (1968-12-01), Gorog et al.
patent: 4580277 (1986-04-01), Angello et al.
patent: 4726038 (1988-02-01), Ikegami et al.
Safourek Benedict V.
Sumitomo Electric Industries Ltd.
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