| 摘要 |
<p>An encoding arrangement for encoding (n-1)-bit information words into n-bit channel words so as to obtain a channel signal of concatenated channel words is disclosed. The channel signal is a bit sequence having the virtue that at most k 'zeroes' between 'ones' occur. The encoding arrangement comprises input means (1) for receiving the (n-1)-bit information words, converting means (2, 4, 5, 7, S1 to S9) for converting the (n-1)-bit information words into n-bit channel words and output means (9) for supplying the channel signal of concatenated n-bit channel words. The converting means comprises inserting means (7.9, S5) for inserting one bit of a first or a second binary value in between a specified first and a second neighbouring bit position (2.8, 2.9) in the (n-1)-bit information words. A 'zero' bit is inserted in between said specified first and second neighbouring position in an (n-1)-bit information word if the number of leading 'zeroes' at the leading end of the information word exceeds a specified first integer number (p-1), or the number of trailing 'zeroes' at the trailing end of the information word exceeds a specified second integer number (q-1), or both. The converting means further comprises setting means (S1, S9) for setting the logical value in a specified third bit position (7.1) into a 'one' value if the number of leading 'zeroes' exceeds said specified first number, and for setting the logical value in a specified fourth bit position (7.17) into a 'one' value if the number of trailing 'zeroes' exceeds said specified second number, the specified third bit position being one of a specified third number (p) of leading bit positions of the information word, the specified fourth bit position being one of a specified fourth number (q) of trailing bit positions of the information word. The specified first and second numbers having a relationship with k. A corresponding decoding arrangement is also disclosed.</p> |
