Digital signal recording/reproducing method

A method of reproducing digital signal sequences from a recording medium, comprising the steps of:

• recognizing blocks in each of read signal sequences obtained from said recording medium;
• determining a threshold value for each block on the basis of read values of bit data carrying all digit levels to be read and determined;
• and
• reading and determining each digit level of bit data of said read signal sequences on the basis of said threshold value.

A method of recording a plurality of digital signal sequences at predetermined unitary recording areas in a recording medium, respectively, comprising the steps of:

• transforming each of said digital signal sequences to be recorded into blocks;
• locating reference bit data carrying at least first and second digit levels to be read and determined upon reproduction at respective predetermined positions in each of the resultant data blocks;
• and
• recording a sequence of the data blocks at the corresponding ones of said predetermined unitary recording areas in said recording medium.

A method of reproducing digital signal sequences from a recording medium, comprising the steps of:

• recognizing blocks in each of read signal sequences obtained from said recording medium;
• determining a threshold value for each of said blocks on the basis of read values of reference bit data carrying at least first and second digit levels to be read and determined, said reference bit data being located at predetermined positions within each of said block;
• and
• reading and determining each digit level of bit data of said read signal sequences on the basis of said threshold value.

A method of recording a plurality of digital signal sequences at predetermined unitary recording areas in a recording medium, respectively, comprising the steps of:

• preparing correction digital signals each corresponding to each of said predetermined unitary recording areas and each including bit data carrying digit levels to be determined upon reproduction and having a predetermined bit position relationship corresponding to said digit levels;
• mixing each of said correction digital signals with each of said digital signal sequences;
• and
• recording the resultant digital signal sequences at the corresponding ones of said predetermined unitary recording areas in said recording medium.

A method of reproducing digital signal sequences from a recording medium, comprising the steps of:

• recognizing correction digital signals for each of predetermined unitary recording areas from the read signal sequences obtained from said recording medium;
• identifying bit data carrying digit levels to be read and determined from said correction digital signals on the basis of a predetermined bit position relationship thereof;
• detecting deviation values from the respective expected values of the identified bit data;
• and
• correcting each value of bit data of said digital signal sequences on the basis of said deviation values.