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

Abstract

A method and apparatus for recording or reproducing data in which high performance encoding and a high efficiency decoding are realized to lower the decoding error rate. A magnetic recording and/or reproducing apparatus 50 includes, in a recording system, a modulation encoder 52 for modulation encoding input data in a predetermined fashion and an interleaver 53 for interleaving data supplied from the modulation encoder 52 to re-array the data sequence. The magnetic recording and/or reproducing apparatus 50 also includes, in a reproducing system, a first deinterleaver for interleaving the input data for re-arraying the data sequence so that the bit sequence of data re-arrayed by the interleaver 53 will be restored to its original bit sequence, a modulation SISO decoder for modulation decoding data supplied from the first deinterleaver and a second deinterleaver for interleaving data corresponding to a difference value between data output by the modulation SISO decoder and data output by the first deinterleaver to re-array the data sequence of the difference data.

1 . A data recording apparatus for recording data on a recording medium, comprising: 
 modulation encoding means for applying predetermined modulation encoding to input data;    interleaving means for interleaving data supplied from said modulation encoding means for re-arraying the data sequence; and    precoding means for filtering data supplied from said interleaving means to compensate for channel characteristics.    
     
     
         2 . (canceled)  
     
     
         3 . The data recording apparatus according to  claim 1  further comprising: 
 error correction coding means for applying error correction coding to the input data;  
 said modulation encoding means modulation encoding the data supplied from said error correction coding means.  
 
     
     
         4 . The data recording apparatus according to  claim 1  wherein said modulation encoding means encodes input data in accordance with a constraint condition.  
     
     
         5 . The data recording apparatus according to  claim 4  wherein said interleaving means interleaves data encoded by said modulation encoding means so that said constraint condition is satisfied.  
     
     
         6 . The data recording apparatus according to  claim 4  wherein said modulation encoding means encodes the input data by block modulation.  
     
     
         7 . The data recording apparatus according to  claim 6  wherein said interleaving means interleaves data encoded by said modulation encoding means in terms of a modulation encoding block as a unit.  
     
     
         8 . The data recording apparatus according to  claim 4  wherein said modulation encoding means encodes input data in accordance with a trellis conforming to said constraint condition.  
     
     
         9 . The data recording apparatus according to  claim 8  wherein said interleaving means interleaves data encoded by said modulation encoding means in terms of a modulation encoding block of said trellis as a unit.  
     
     
         10 . The data recording apparatus according to  claim 1  wherein data is recorded on said recording medium in a magnetic, optical or magneto-optical system.  
     
     
         11 . A data recording method for recording data on a recording medium, comprising the steps of: 
 applying predetermined modulation encoding to input data;    interleaving the modulation-encoded data supplied from said modulation encoding step for re-arraying the data sequence; and    filtering the interleaved modulation-encoded data to compensate for channel characteristics.    
     
     
         12 . (canceled)  
     
     
         13 . The data recording method according to  claim 11  wherein said input data is error correction coded data.  
     
     
         14 . The data recording method according to  claim 11  wherein said step of applying encodes input data in accordance with a constraint condition.  
     
     
         15 . The data recording method according to  claim 14  wherein said step of interleaving interleaves the modulation-encoded data so that said constraint condition is satisfied.  
     
     
         16 . The data recording method according to  claim 14  wherein said step of applying encodes the input data by block modulation.  
     
     
         17 . The data recording method according to  claim 16  wherein said step of interleaving the modulation-encoded data in terms of a modulation encoding block as a unit.  
     
     
         18 . The data recording method according to  claim 14  wherein said step of applying encodes input data in accordance with a trellis conforming to said constraint condition.  
     
     
         19 . The data recording method according to  claim 18  wherein said step of interleaving interleaves the modulation-encoded data in terms of a modulation encoding block of said trellis as a unit.  
     
     
         20 . The data recording method according to  claim 11  wherein data is recorded on said recording medium in a magnetic, optical or magneto-optical system.  
     
     
         21 - 88 . (Canceled)