Abstract: A method of converting m-bit information words to a run-length constrained modulated signal includes converting the information words into n-bit code words. The available code words are distributed over at least one group (G1) of a first type and at least one group (G2) of a second type. The selection of a code word belonging to the group of the first or second type establishes a coding state of the first type (S1) or one of a number r of coding states (S2, S3) of the second type, depending on the current information word. For each information word, a subset of code words is available, this subset having at least one disjunct code word for each of the r coding states. The selection from the subset of the code word to be delivered is based the coding state, on dynamically verifying the run-length constraint for the sequence of code words, and on an additional criterion, like the low frequency content of the modulated signal.

Abstract: The invention relates to a modulation code system, including an encoder and a decoder and two corresponding modulation code methods. More specifically, the encoder 100 serves for transforming an original signal s into an encoded signal c satisfying predefined second constraints. Such encoder signals are, for example, transmitted via a channel 300 or stored on a recording medium. After receipt or restoration, said encoded signal c is decoded by a decoder 200 in order to regenerate the original signal s again. It is the object of the present invention to improve the known modulation code systems and methods in such a way that their embodiment requires less hardware. This object is solved in that the encoder 100 comprises a series connection of a modulation code encoder 110 and of a transformer encoder 120 allowing an N-time integration of the output signal of said modulation code encoder 110.

Abstract: This invention relates to a digital modulation method and apparatus used for recording an audio or video signal, computer data, and etc on a recording medium such as an optical or magneto-optical disc. Data words of m bits are translated into code words of n bits in accordance with a conversion table. The code words satisfy a (d, k) constraint in which at least d “0”s and not more than k “0”s occur between consecutive “1”s. The n-bit code words alternate with p-bit merging words which are selected such that between the leading “1” in the code word following the merging word and the trailing “1” in the merging word are at least d “0”s, and further that between the trailing “1” in the code word preceding the merging word and the leading “1” in the merging word are at least d “0”s.

Abstract: This invention relates to a digital modulation method and apparatus used for recording an audio or video signal, computer data, and etc on a recording medium such as an optical or magneto-optical disc. Data words of m bits are translated into code words of n bits in accordance with a conversion table. The code words satisfy a (d, k) constraint in which at least d “0”s and not more than k “0”s occur between consecutive “1”s. The n-bit code words alternate with p-bit merging words which are selected such that between the leading “1” in the code word following the merging word and the trailing “1” in the merging word are at least d “0”s, and further that between the trailing “1” in the code word preceding the merging word and the leading “1” in the merging word are at least d “0”s.

Abstract: The invention relates to a modulation code system, including an encoder and a decoder and two corresponding modulation code methods. More specifically, the encoder 100 serves for transforming an original signal s into an encoded signal c satisfying predefined second constraints. Such encoder signals are, for example, transmitted via a channel 300 or stored on a recording medium. After receipt or restoration, said encoded signal c is decoded by a decoder 200 in order to regenerate the original signal s again. It is the object of the present invention to improve the known modulation code systems and methods in such a way that their embodiment requires less hardware. This object is solved in that the encoder 100 comprises a series connection of a modulation code encoder 110 and of a transformer encoder 120 allowing an N-time integration of the output signal of said modulation code encoder 110.

Abstract: In a device for encoding a stream of databits of a binary source signal into a stream of databits of a binary channel signal the bitstream of the source signal is divided into n-bit source words. The device comprises converting means adapted to convert a block of p consecutive n-bit source words into a corresponding block of p consecutive m-bit channel words, such that the conversion for at least most of the n-bit source words is parity preserving and/or parity inverting, where m>n≧1. The converting means comprise memory means which contain for each n-bit source word a number of m-bit channel words, arranged in coding states, and a corresponding state number, indicating the state for a next m-bit channel word. After each block of source words q dc-control sourcebits are added, which are converted into r dc-control channelbits, independent of the conversion of a following source word.

Abstract: In a device for encoding a stream of databits of a binary source signal into a stream of databits of a binary channel signal the bitstream of the source signal is divided into n-bit source words. The device comprises converting means adapted to convert a block of p consecutive n-bit source words into a corresponding block of p consecutive m-bit channel words, such that the conversion for at least most of the n-bit source words is parity preserving and/or parity inverting, where m>n≧1. The converting means comprise memory means which contain for each n-bit source word a number of m-bit channel words, arranged in coding states, and a corresponding state number, indicating the state for a next m-bit channel word. After each block of source words q decontrol sourcebits are added, which are converted into r dc-control channelbits, independent of the conversion of a following source word.