Method for encoding and decoding recording codes and method for inserting synchronization signals

A computerized method for encoding recording codes for machine storage or transmission of digital data signals wherein data bits are encoded into channel bits, comprising:

• allotting respective channel bits “00X”, “010” and “10X” to 3 patterns of data bits among 4 pattern of data bits having 2 bits, where X designates an indefinite bit which becomes “1” when the channel bit succeeding the indefinite bit is “0” and becomes “0” when the channel bit succeeding the indefinite bit is “1”;
• allotting channel bits “000010”, “00000X”, and “100010” and “10000X” to 4 patterns of data bits having 4 bits which are a combination of two bits having a remaining one pattern among said 4 pattern of said data bits having 2 bits and additional two bits;
• allotting channel bits “000000010” or “100000010” as a special pattern to data bits having 6 bits which are the continuation of alternate 3 patterns of data bits to be encoded to channel bits “010” and data bits to be encoded to channel bits “10X”, one of said channel bits “000000010” and “100000010” being selected according to a predetermined criterion;
• and
• outputting electrical signals representing characteristics of said digital data signals.

A computerized method for encoding recording codes for machine storage or transmission of digital data signals wherein data bits are encoded into channel bits, comprising:

• allotting respective channel bits “00X”, “010” and “10X” to 3 patterns of data bits among 4 pattern of data bits having 2 bits, where X designates an indefinite bit which becomes “1” when the channel bit succeeding the indefinite bit is “0” and becomes “0” when the channel bit succeeding the indefinite bit is “1”;
• allotting channel bits “000010” or “100010” to one of 4 pattern of data bits having 4 bits which are a combination of two bits having a remaining one pattern among said 4 pattern of said data bits having 2 bits and additional two bits, and one of said channel bits “000010” and “100010” being selected according to a predetermined criterion;
• allotting channel bits “00000X” and “10000X” to other two of said 4 pattern of data bits having 4 bits;
• allotting channel bits “000000010”, “00000000X”, “100000010” and “10000000X” to 4 patterns of data bits having 6 bits which are a combination of 4 bits having a remaining one pattern among said 4 pattern of said data bits having 4 bits and additional two bits;
• and
• outputting electrical signals representing characteristics of said digital data signals.

A computerized method for encoding recording codes for machine storage or transmission of digital data signals wherein data bits are encoded into channel bits, comprising:

• allotting respective channel bits “00X”, “010” and “10X” to patterns of data bits among 4 pattern of data bits having 2 bits, where X designates an indefinite bit which becomes “1” when the channel bit succeeding the indefinite bit is “0” and becomes “0” when the channel bit succeeding the indefinite bit is “1”;
• allotting channel bits “000010”, “00000X”, “100010” and “10000X” to 4 pat of data bits having 4 bits which are a combination of two bits having a remaining one pattern among said 4 pattern of said data bits having 2 bits and additional two bits;
• allotting channel bits “000000010”, “00000000X”, “100000010”, or “10000000X” as a special pattern to data bits having 6 bits which are the continuation of alternate 3 patterns of data bits to be encoded to channel bits “010” and data bits to be encoded to channel bits “10X”, one of said channel bits “000000010”, “00000000X”, “100000010” and “10000000X” being selected according to a predetermined criterion;
• and
• outputting electrical signals representing characteristics of said digital data signals.