Inverting the bits of the 4-ary output symbols produces an output bit-stream with (g, I) -constraints as in the PRML (g, I) codes used in reverse-concatenation modulation systems.
使所述四进位输出符号的位反相将产生具有(G, i)约束的输出比特流，如在反向串连调制系统中所使用的PRML (G, i)码中那样。
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