| 摘要 |
PCT No. PCT/AU88/00244 Sec. 371 Date Apr. 14, 1989 Sec. 102(e) Date Apr. 14, 1989 PCT Filed Jul. 8, 1987 PCT Pub. No. WO89/00364 PCT Pub. Date Jan. 12, 1989.A transmission arrangement includes a switched resonant circuit (5) for switching data states of digital signals on a pair of transmission lines (1, 2) and a regenerative circuit (7) for feeding power back on the lines. The switched resonant circuit has a switching device (22) connected in series with an inductance (20) and parallel with a capacitance (21). A digital logic system (8) controls the switching device such that switching occurs at a line current zero crossover point. Where a change of data state is to be transmitted to a receiver (6), the logic system (8) turns the switching device on at an appropriate time. The switching device is switched off when the voltage (+Vm) on the lines reaches approximately the same magnitude in the opposite sense (-Vm). The change in the line voltage indicates a change of the data state to the receiver. |
