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

A data reproducing method for reproducing data recorded by a recording method for recording data on a recording medium, the recording method including an error correction encoding step of applying error correction cording to input data, first interleaving step of interleaving data supplied from said error correction encoding step for re-arraying the data sequence, a step of performing modulation encoding on the interleaved data, and step of executing serial concatenated coding between the steps of applying error correction coding and performing modulation encoding, said data reproducing method comprising the steps of:

• deinterleaving the input data in its sequence for restoring the bit sequence of data re-arrayed by said first interleaving step to a bit sequence of data encoded by said error correction encoding step;
• decoding the error correction codes of data supplied from said step of deinterleaving;
• and
• interleaving the sequence of data for re-arraying the sequence of data given by a difference between data decoded in said step of decoding and data output from said step of deinterleaving based on the same interleaving position information as that of said first interleaving step.

A data recording and reproducing apparatus for recording and reproducing data on or from a recording medium, comprising:

• error correction encoding means for applying error correction encoding to input data;
• first interleaving means for interleaving data supplied from said error correction encoding means for re-arraying the data sequence;
• modulation encoding means for performing predetermined modulation encoding on data supplied from said first interleaving means;
• whereby serial concatenated coding is executed between the error correction encoding means and the modulation encoding means;
• deinterleaving means for interleaving reproduced data in its sequence for restoring the bit sequence of data re-arrayed by said first interleaving means to a bit sequence of data encoded by said error correction encoding means;
• error correction decoding means for decoding the error correction codes of data supplied from said deinterleaving means;
• and
• second interleaving means for interleaving the sequence of data given by a difference between data output from said error correction decoding means and data output from said deinterleaving means based on the same interleaving position information as that of said first interleaving means.

A data recording and reproducing method for recording and/or reproducing data on or from a recording medium, comprising the steps of:

• applying error correction encoding to input data;
• interleaving the error correction encoded data supplied from said step of applying for re-arraying the data sequence;
• performing modulation encoding on the interleaved data;
• executing serial concatenated coding between the steps of applying error correction coding and performing modulation encoding;
• deinterleaving reproduced data in its sequence for restoring the bit sequence of data re-arrayed by said step of interleaving to a bit sequence of data encoded by said step of applying;
• decoding the error correction codes of data supplied from said step of deinterleaving;
• and
• interleaving the sequence of data given by a difference between data output from said step of decoding and data output from said step of deinterleaving based on the same interleaving position information as that of said step of interleaving the error correction encoded date.