Patent ID: 7489460

Claim:
A magnetic data read circuit for reading magnetic data in a magnetic recording medium comprising: a differentiation circuit and an integration circuit which are individually connected to a magnetic head; and a means of read judgment for pass/fail judgment on reading operation of magnetic data detected at the magnetic head; wherein the means of read judgment includes: a first storage section in which time interval data relating to an output signal of the differentiation circuit is stored through one transfer operation of the magnetic recording medium; a second storage section in which time interval data relating to an output signal of the integration circuit is stored through the one transfer operation of the magnetic recording medium; a read judgment section which obtains time interval data from at least one of the first storage section and the second storage section and makes a first pass/fail judgment on reading operation of the magnetic data; and wherein when the read judgment section has made a fail judgment as the first pass/fail judgment on the time interval data from the one of the first storage section and the second storage section, the read judgment section obtains time interval data from the other of the first storage section and the second storage section to make a second pass/fail judgment without performing another transfer operation of the magnetic recording medium.