| 摘要 |
In apparatus for transmitting digital symbols over a band-limited channel using a modulated carrier system by encoding the symbols into discrete signals selected by a finite state encoder from a signal alphabet comprised of subsets each corresponding to transitions from a particular previous state to a particular current state of the encoder, the improvement in which at least two of the subsets have a signal in common, and at least one signal belongs to only one of the two subsets.
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