Method and apparatus for reproducing data and method and apparatus for recording and/or reproducing data

A data reproducing apparatus for reproducing data recorded by a recording equipment for recording data on a recording medium, the recording equipment including modulation encoding means for applying predetermined modulation encoding to input data and first interleaving means for interleaving data supplied from said modulation encoding means for re-arraying the data sequence, said data reproduction apparatus comprising:;

• deinterleaving means for interleaving reproduced data in its sequence such as to restore the sequence of data bits re-arrayed by said first interleaving means to the bit sequence of the data as encoded by said modulation encoding means;
• modulation decoding means for modulation decoding the data supplied from said deinterleaving means;
• and
• second interleaving means for interleaving data corresponding to a difference between data output by said modulation decoding means and data output by said deinterleaving means, based on the same interleaving position information as that of said first interleaving means, for re-arraying the sequence of the difference data.

A data reproducing method for reproducing data recorded by a recording method for recording data on a recording medium including a modulation encoding step of applying predetermined modulation encoding to input data and a first interleaving step of interleaving data encoded in said modulation encoding step, for re-arraying the data sequence, said data reproduction method comprising the steps of:

• deinterleaving the input data in its sequence such as to restore the sequence of data bits re-arrayed by said first interleaving step to the bit sequence of the data as encoded by said modulation encoding step;
• modulation decoding the data supplied from said step of deinterleaving;
• and
• interleaving data corresponding to a difference between data decoded in said modulation encoding step and data re-arrayed in said step of deinterleaving, based on the same interleaving position information as that of said first interleaving step, for re-arraying the sequence of the difference data.

A data recording and reproducing apparatus for recording and reproducing data for a recording medium, said apparatus comprising

• modulation encoding means for applying predetermined modulation encoding to input data;
• first interleaving means for interleaving data supplied from said modulation encoding means for re-arraying the data sequence;
• deinterleaving means for interleaving reproduced data in its sequence such as to restore the sequence of data bits re-arrayed by said first interleaving means to the bit sequence of the data as encoded by said modulation encoding means;
• modulation decoding means for modulation decoding the data supplied from said deinterleaving means;
• and
• second interleaving means for interleaving data corresponding to a difference between data output by said modulation decoding means and data output by said deinterleaving means, based on the same interleaving position information as that of said first interleaving means, for re-arraying the sequence of the difference data.

A data recording and reproducing method for recording and reproducing data for a recording medium, said method comprising the steps of:

• applying predetermined modulation encoding to input data;
• interleaving the modulation-encoded data for re-arraying the data sequence;
• deinterleaving reproduced data in its sequence such as to restore the sequence of data bits re-arrayed by said step of interleaving to the bit sequence of the modulation-encoded data;
• modulation decoding the data supplied from said step of deinterleaving;
• and
• interleaving data corresponding to a difference between data decoded in said step of modulation decoding and data re-arrayed in said step of deinterleaving based on the same interleaving position information as that of said step of interleaving the modulation-encoded data.