Patent ID: 7224296

Claim:
A signal embedded in a carrier, the signal comprising a runlength limited (RLL) encoded binary d, k channel bitstream, wherein parameter d defines a minimum number and parameter k defines a maximum number of zeroes between any two ones of said bitstream or vice versa, comprising: RLL rows including a number of sections of respectively N successive RLL channel bits, each RLL row representing a parity-check code-word, called row parity-check code-word, in which a row-based parity-check constraint for said RLL row has been realized; wherein column parity-check rows having K sections of respectively N successive channel bits are located at predetermined positions of a group of M RLL rows, K, N and M being integer values, said column parity-check rows comprising a plurality of column parity-check enabling channel words, wherein each of said column parity-check enabling channel words realizes a column-based parity-check constraint for all corresponding segments of at least said M RLL rows of said group that correspond to a specific column parity-check enabling channel word, for outputting a column parity-check codeword.