Apparatus for modulating digital data and adding control data

A digital data processing device for modulating input data comprising a plurality of code words, each of which comprises 2n bits of digital data, n being a positive integer, so that at least one n-bit part of the code word is influenced by control data, said device comprising:

• (a) modulation means for modulating the plurality of code words so that a portion of a predetermined code word exerts an influence on a part of a subsequent code word;
• (b) detection means for detecting a specific frequency component in the modulated data modulated by said modulation means;
• (c) generation means for generating the control data to be added to the predetermined code word in accordance with a detection result of said detection means;
• (d) inverting means for obtaining invented data of modulated data of the part of the predetermined code word that is influenced by the control data;
• (e) selection means for selectively outputting the modulated data of the part of the predetermined code word that is influenced by the control data and the inverted data obtained by said inverting means according to the control data;
• and
• (f) output means for selectively outputting the control data, an output of said selection means, and data of another n-bit part of the predetermined code word that is mutually exclusive of the one n-bit part and is not influenced by the control data.

A digital data processing device for modulating input data comprising a plurality of code words, each of which comprises 2n bits of digital data, n being a positive integer, so that at least a part of the code word is influenced by control data formed by a single-bit, and adding said control data to every code word, said device comprising:

• (a) separating means for separating each of the code words of the input digital data into two mutually-exclusive n-bit data groups, comprising a first data group and a second data group;
• (b) a 1T precoder for performing a 1T precoder operation on each of the code words, T being a bit period, the 1T precoder alternatively performing the 1T precoder operation on the first data group and the second data group;
• (c) detection means for detecting a specific frequency component in the code word output from the 1T precoder;
• (d) generation means for generating the control data according to a detection result of said detection means;
• and
• (e) inverting means for inverting a code of each of the n bits of the first data group output from the 1T precoder according to the control data generated by said generation means.

A digital data processing device for modulating input data comprising a plurality of code words, including a predetermined code word and a subsequent code word, each of which comprises a plurality of bits of digital data, so that at least a part of each code word is influenced by control data, and adding the control data to every code word, each of the plurality of code words having a plurality of mutually-exclusive data groups, each of which comprises a plurality of bits of the digital data, including a first data group and a second data group, said device comprising:

• (a) modulation means for modulating each of the plurality of code words of the input data so that the first data group of the predetermined code word is influenced by the control data to be added to the predetermined code word, and the second data group of the subsequent code word is influenced by the control data to be added to the predetermined code word;
• (b) generation means for generating the control data to be added, to the modulated predetermined code word by using the first data group of the predetermined modulated code word and the second data group of the subsequent modulated code word;
• and
• (c) inverting means for inverting a code of each of the plurality of bits of the first data group of the predetermined modulated code word according to the control data generated by said generation means.

A digital data processing apparatus for modulating input data comprising a plurality of code words, each of which comprises plural bits of digital data, so that at least a part of each code word is influenced by control data, and adding said control data to every code word, said apparatus comprising:

• separating means for separating each of the code words of the input data into two mutually-exclusive data groups, comprising a first data group and a second data group;
• modulation means for modulating output data from said separating means so that the first data group of a predetermined code word is influenced by said control data to be added to the predetermined code word, and the second data group of the predetermined code word is not influenced by said control data to be added to the predetermined code word;
• and
• generating means for generating said control data to be added to said predetermined modulated code word by using the first data group of said predetermined modulated code word and without using the second data group of said predetermined modulated code word.