Device for encoding n-bit source words into corresponding m-bit channel words and decoding m-bit channel words into corresponding n-bit source words

A encoding device comprising:

• converting means for converting n-bit source words into corresponding m-bit channel words in such a way that the m-bit channel words lack successive bits having a binary value that results in signal transitions;
• and
• control means for carrying out stochastic DC-control on the binary channel signal by influencing a choice made in the binary value of a single bit position in each of multiple channel words during the conversion, the bit position being the same bit position in each of the multiple channel words.

A method comprising:

• converting n-bit source words into corresponding m-bit channel words in accordance with a conversion of the Jacoby type, where m and n are integers and m>n, the bits having a binary value;
• and
• providing DC-control of the binary channel signal influencing a choice made in the binary value of a single bit position in each of multiple channel words during the conversion, the bit position being the same bit position in each of the multiple channel words.

A channel signal comprising m-bit channel words corresponding to respective n-bit source words in accordance with a conversion of the Jacoby type, where m and n are integers and m>n, wherein, in the binary channel signal, a pair of blocks of p consecutive m-bit channel words, being converted from an identical pair of blocks of p consecutive n-bit source words, is present, the blocks of the pair of m-bit channel words differing from each other in the bit value at one bit position only in the blocks, p being an integer which is larger than 1.

A record carrier comprising a substrate and a recording layer containing a channel signal having m-bit channel words each corresponding to a respective n-bit source word in accordance with a conversion of the Jacoby type, where m and n are integers and m>n, wherein a pair of blocks of p consecutive m-bit channel words are converted from identical blocks of p consecutive n-bit source words, the blocks of m-bit channel words differing from each other in the bit value at one bit position only in the blocks, p being an integer which is larger than 1.

A decoding device comprising:

• means for receiving an input stream of databits of a channel signal and dividing the stream into consecutive m-bit channel words;
• deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m and n are integers and m>n, wherein pairs of blocks of p consecutive m-bit channel words are deconverted into identical blocks of p consecutive n-bit source words, the pairs of blocks of p consecutive m-bit channel words differing from each other in the bit value at one bit position only in the, blocks, p being an integer which is larger than 1.

A player comprising:

• means for reading a DC controlled channel signal from an information carrier;
• means for dividing the channel signal into consecutive m-bit channel words;
• deconverting means for deconverting the m-bit channel words into corresponding respective n-bit source words in accordance with a deconversion of the Jacoby type, where m and n are integers and m>n, wherein pairs of blocks of p consecutive m-bit channel words are deconverted into identical blocks of p consecutive n-bit source words, the pairs of blocks of p consecutive m-bit channel words differing from each other in the bit value at one bit position only in the blocks, p being an integer which is larger than 1.

A decoding device comprising:

• means for receiving a DC controlled input stream of databits of a channel signal and dividing the stream into consecutive m-bit channel words;
• and
• deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m and n are integers and m>n, and the bits have a binary value, and wherein the deconverting depends on a choice made in the bit value of a single bit position in each of multiple channel words during a previous converting of the n-bit source words into the m-bit channel words during the converting, the bit position being a single bit position in each of the multiple channel words, the bit position being the same bit position in each of the multiple channel words.

A method comprising:

• converting n-bit source words into corresponding m-bit channel words in accordance with a conversion of the Jacoby type, where m=2 and n=2;
• and
• providing DC-control of the binary channel signal influencing a choice made in the conversion of source words to channel words during the converting.

A decoding device comprising:

• means for receiving a DC controlled input stream of databits of a channel signal and dividing the stream into consecutive m-bit channel words;
• and
• deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m=3 and n=2, wherein the deconverting depends on a choice made in a previous converting of the n-bit source words into the m-bit channel words during the converting.