H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 3/12 (2006.01) H04L 5/14 (2006.01)
Patent
CA 2070579
ABSTRACT OF THE DISCLOSURE A signal transmitter-receiver system which comprises first and second two transmitter-receiver units interconnected by a signal transmission line, the first transmitter-receiver unit including first transmission means for delivering one of different kinds of a.c. signals different in phase difference with respect to a reference a.c. signal to the signal trans- mission line at every predetermined communication time, the second transmitter-receiver unit including second receiving means for identifying the phase difference of the a.c. signal on the signal transmission line with respect to the reference a.c. signal at every communi- cation time mentioned, the second transmitter-receiver unit including second transmission means for changing the combination of positive and negative amplitudes of the a.c. signal on the signal transmission line to one of a plurality of kinds at every communication time mentioned, the first transmitter-receiver unit includ- ing first receiving means for identifying the combina- tion of positive and negative amplitudes of the a.c. signal on the signal transmission line at every communi- cation time mentioned.
Fetherstonhaugh & Co.
Nakanishi Metal Works Co. Ltd.
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