Pulse or digital communications – Repeaters – Testing
Patent
1987-07-10
1989-05-09
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 57, 375 80, 375 86, 329104, 332 9R, H04L 2718
Patent
active
048295426
ABSTRACT:
A modem system is disclosed which has improved reliability of detection of transmitted PSK data using a simple signal delay detection scheme. A transmission signal is produced in which repetitive digital time slots each contain phase encoded "mark" or "space" data. Each time slot includes a reference phase portion at at least one of a front and rear portion of the tome slot. The phase of the transmitted signal changes in the remaining portion of each time slot in accordance with applied digital data. For a "mark" data signal the phase changes from a reference phase in a first direction to predetermined phase in a first half of the remaining portion of the time slot, and then back to the reference phase before the end of the time slot. For a "space" data signal the phase changes from the reference value in a second direction opposite the first to another predetermined value in a first half of the remaining portion of the time slot, and then back to the reference phase before the end of the time slot. A simple delay detection demodulation system is used to recreate the original digital signal.
REFERENCES:
patent: 4417219 (1983-11-01), Brossand
patent: 4726038 (1988-02-01), Ikegami et al.
Safourek Benedict V.
Sumitomo Electric Industries Ltd.
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