Communications: electrical – Systems – Selsyn type
Patent
1989-10-10
1991-01-29
Crosland, Donnie L.
Communications: electrical
Systems
Selsyn type
340310R, 370 43, 375 37, H04M 1104
Patent
active
049889729
ABSTRACT:
A transmission signal sending and receiving method using the steps of setting the reference channel and data channels in each cycle of the AC voltage wave for transmission in the sending and receiving means, superposing the reference transmission signal onto the reference channel and the modulated data transmission signals onto the data channels in the sending means, receiving the reference transmission signal and data transmission signals by being separated from the AC voltage wave for transmission in the receiving means, and monitoring data transmission signals by comparing the level and phase of the reference transmission signal received by the reference channel with those of the data transmission signals received in the data channels, and thereby comparing the reference transmission signal with the data transmission signals received in each cycle of the AC voltage wave for transmission.
REFERENCES:
patent: 4400688 (1983-08-01), Johnston et al.
patent: 4563679 (1986-01-01), Arai et al.
patent: 4737657 (1988-04-01), Jatko et al.
T. L. J. Salo-Load Management and Remote Meter Reading System, Apr. 13, 1987, pp. 268-271/IEEE Mates Fifth International Conference on Metering Apparatus and Tariffs for Electricity Supply, Conference publication No. 277.
Crosland Donnie L.
Osaki Electric Co. Ltd.
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