| 摘要 |
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 transmission 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 communication 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 including first receiving means for identifying the combination of positive and negative amplitudes of the a.c. signal on the signal transmission line at every communication time mentioned.
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