Data processing apparatus and data recording apparatus

A data recording apparatus for rearranging digital information data to increase immunity against errors and for recording the rearranged digital information data on a tape medium, comprising:

• a data accumulation memory for accumulating digital information data;
• packing means for packing the digital information data into fixed-length frames whose length depends upon the format of the data;
• an external-code encoder for encoding the digital information data output from the packing means using an external error-correcting-code and generating an external-code parity corresponding to the external-coded data;
• a shuffling table memory for storing a shuffling table, for receiving positional information indicating the position of a data unit in the digital information data as an address, and for outputting a write or read address of said data accumulation memory by converting the positional information according to the shuffling table;
• an external memory having a plurality of shuffling tables corresponding to formats of digital information data to be shuffled;
• means for storing a shuffling table in said shuffling table memory selected from the plurality of shuffling tables in said external memory;
• the stored shuffling table being selected according to the format of the digital information data;
• shuffling means for shuffling the digital information data output from the external-code encoder using the converted positional information, thereby shuffling the digital information data in accordance with the shuffling table;
• the shuffling means outputting the shuffled digital information along with the corresponding external-code parity in sync blocks;
• and
• an internal-code encoder for encoding the digital information data output from the shuffling means using an internal error-correcting-code and generating an internal-code parity corresponding to the internal-coded data;
• and
• recording means for recording the digital information data output from the internal-code encoder in sync blocks having the corresponding internal-code parity and external-code parity on said tape medium.