Digital signal reproducing apparatus using a viterbi decoder

A digital signal reproducing apparatus for obtaining a regenerated digital signal by reproducing record information from a read signal read from a recording medium on which digital signals are recorded, said digital signal reproducing apparatus comprising:

• an A/D convertor for successively sampling said read signal and converting the signal to a digital sample value series,
• a sample value extracting means for extracting a maximum sample value having a maximum level and a minim sample value having a minimum level from sample values in said sample value series,
• an amplitude value detecting means for obtaining an amplitude value according to a result of subtraction between said maximum sample value and said minimum sample value and generating an amplitude signal corresponding to said amplitude value,
• a dividing means for obtaining a result of dividing each of the sample values in said sample value series by a value corresponding to said amplitude signal as an amplitude-corrected sample value, and
• a decoding means for executing decoding according to said amplitude-corrected sample value to obtain a regenerated digital signal.