Communications: electrical – Systems – Selsyn type
Patent
1991-06-27
1993-03-30
Crosland, Donnie L.
Communications: electrical
Systems
Selsyn type
340310R, 375 36, 375 37, 370 6, H04B 2300, H04M 1100
Patent
active
051987961
ABSTRACT:
In a communication system in which outbound information in the form of multi-bit messages is carried by cyclic waveforms over an electric power distribution network, the signal is detected independently at any of a plurality of locations remote from the source by obtaining signal data by sampling the cyclic waveform over a predetermined portion of successive cycles. The predetermined portion is divided into a plurality of predetermined ranges. From a predetermined number of bits at the start of each message, the particular predetermined range which contains the greatest signal strength is selected. For the remaining bits of the message, only those samples in the selected range are analyzed to detect the outbound message. To reject cross-talk, preselected ranges in which cross-talk signals are likely to appear are monitored, and the in-phase messages are rejected when theh signal strength in the in-phase range is less than the signal strength in at least one of the cross-talk ranges.
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patent: 4218655 (1980-08-01), Johnston et al.
patent: 4400688 (1983-08-01), Johnston et al.
patent: 4914418 (1990-04-01), Mak et al.
patent: 4996513 (1991-02-01), Mak et al.
Crosland Donnie L.
Distribution Control Systems, Inc.
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