(n-1) -encoding device and method for encoding bit information word into n-bit channel word, and decoding device and method for decoding channel word into information word

摘要

An encoding apparatus is disclosed for encoding (n-1) -bit information words into n-bit channel words to obtain a channel signal of concatenated channel words. The channel signal is a bit sequence having a characteristic of generating up to k '0's between'1's, and the encoding apparatus comprises: input means (1) for receiving the (n-1) -bit information words; ), Conversion means (2, 4, 5, 7, S _{1 to} S ₉ ) for converting the (n-1) -bit information words into n-bit channel words, and the channel signal of the connected n-bit channel words. It comprises an output means 9 for supplying. The converting means comprises inserting means 7.9 for inserting one bit of the first or second binary value between the specific first and second neighboring bit positions 2.8, 2.9 in the (n-1) -bit information words. , S ₅ ). The number of preceding '0's at the leading end of the information word exceeds a specific first integer p-1, or the number of trailing'0's at the trailing end of the information word specifies a specific second integer q In the case of -1) or in both cases, a '0' bit is inserted between the particular first and second neighboring positions in the (n-1) -bit information word. The converting means also sets the logical value at the particular third bit position 7.1 to the value '1' if the number of preceding '0's exceeds the particular first number, and the trailing'0's. Setting means (S ₁ , S ₉ ) for setting the logic value at a particular fourth bit position (7.17) to a value '1' when the number exceeds the specific second number, wherein the particular third bit position is Said setting means (1) being one of a particular third number (p) of preceding bit positions of an information word, said particular fourth bit position being one of a particular fourth number (q) of bit positions trailing of said information word; S ₁ , S ₉ ). The particular first and second numbers have a relationship with k. A corresponding decoding apparatus is also disclosed.