Digital data recording medium, recording method, recording device, reproduction method, and reproduction device

A recording device comprising:

• a first encoding processing section for encoding a certain portion of main data by a first encoding method;
• a second encoding processing section for encoding the other portions of said main data by a second encoding method;
• a modulation processing section for performing a modulation process so that, when data which is recorded in such a manner that output data from said first encoding processing section is decoded by a decoding method corresponding to said first encoding method and thereafter, is further encoded by said second encoding method, is decoded by a decoding method corresponding to said second encoding method, the sum value of DC components per unit time increases;
• and
• a recording section for recording output data from said modulation processing section on a recording medium.

A playback device comprising:

• a head section for reading data from a recording medium, in which, when a certain portion of main data is recorded by being encoded by a first encoding method and the other portions of the main data is recorded by being encoded by a second encoding method, an encoding process is performed by said first encoding method so that, when data which is recorded in such a manner that the data encoded by said first encoding method is decoded by a decoding method corresponding to said first encoding method and thereafter, is further encoded by said second encoding method, is decoded by a decoding method corresponding to said second encoding method, the sum value of DC components per unit time increases;
• a first decoding processing section for performing a decoding process on an output signal, supplied from the head section, by the first decoding method corresponding to said first encoding method;
• a second decoding processing section for performing a decoding process on an output signal, supplied from the head section, by the second decoding method corresponding to said second encoding method;
• and
• a control section for selectively supplying the output signal from said head section to said first decoding processing section and said second decoding processing section.