| 摘要 |
PCT No. PCT/AU82/00166 Sec. 371 Date Jun. 7, 1983 Sec. 102(e) Date Jun. 7, 1983 PCT Filed Oct. 8, 1982 PCT Pub. No. WO83/01360 PCT Pub. Date Apr. 14, 1983.A method and apparatus for transmitting binary sequential data by the multi-level encoding of grouped selected data bits are disclosed. A first number of data bit sequences of the grouped data bits are translated into uniquely chosen ones of a first group of differing level pairs of a multi-level signal and the remaining data bit sequences of the grouped data bits are translated, in a first mode of translation, into uniquely chosen ones of a second group of differing level pairs of the signal, and, in a second mode of translation, into uniquely chosen ones of a third group of differing level pairs of the signal, the mode of translation changing after the occurrence of any of the remaining data bit sequences. The transmission of the signal level pairs representing data is preceded by the transmission of a start synchronizing signal comprising first pair of levels of the signal not contained in the first, second or third groups and is followed by a second pair of levels of the signal not contained in the first, second or third groups.
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