Encoding multiword information by wordwise interleaving

A method for decoding multiword information that is based on multibit symbols disposed in relative contiguity with respect to a medium, having wordwise interleaving and word-wise error protection code facilities, and so providing error locative clues across multiword groups as a preliminary measure before actually decoding,

• characterized by deriving such clues both from high protectivity clue words that are interleaved among clue columns and also from synchronizing columns constituted from synchronizing bit groups through accessing said synchronizing columns where said clue columns are relatively scarcer disposed, said clues being directed to low protectivity target words that are interleaved in a substantially uniform manner among target columns which form uniform-sized column groups between periodic arrangements of clue columns and synchronizing columns.

A device for encoding multiword information that is based on multibit symbols disposed in relative contiguity with respect to a medium, through providing wordwise interleaving means and wordwise error protection encoding means, for so providing error locative clues across multiword groups,

• characterized by said encoding means directing such clues both to high protectivity clue words that are interleaved among clue columns and also to synchronizing columns constituted from synchronizing bit groups through locating means for locating said synchronizing columns where said clue columns are relatively scarcer disposed, all clues being directed to low protectivity target words that are interleaved in a substantially uniform manner among target columns which form uniform-sized column groups between periodic arrangements of clue columns and synchronizing columns.

A device for decoding multiword information that is based on multibit symbols disposed in relative contiguity with respect to a medium, through effecting wordwise deinterleaving and wordwise error code protecting facilities, and so providing error locative clues across multiword groups,

• characterized by being arranged for deriving such clues both from high protectivity clue words that are interleaved among clue columns and also from synchronizing columns constituted from synchronizing bit groups, through accessing means for accessing said synchronizing columns where said clue columns are relatively scarcer disposed, all clues being directed to low protectivity target words that are interleaved in a substantially uniform manner among target columns which form uniform-sized column groups between periodic arrangements of clue columns and synchronizing columns.