Patent ID: 7082566

Claim:
A recording compensation method for performing information recording on an information recording medium or information reproduction from the information recording medium, using a predetermined reproduction signal, a first pattern corresponding to a signal waveform pattern of the reproduction signal, a second pattern corresponding to the signal waveform pattern of the reproduction signal and being different from the first pattern, and a third pattern corresponding to the signal waveform pattern of the reproduction signal and being different from the first pattern and the second pattern, the method comprising: finding a first distance E 1 between the reproduction signal and the first pattern, a second distance E 2 between the reproduction signal and the second pattern, and a third distance E 3 between the reproduction signal and the third pattern; finding a first distance difference D 2 =E 2 −E 1 between the first distance E 1 and the second distance E 2 , and a second distance difference D 3 =E 3 −E 1 between the first distance E 1 and the third distance E 3 ; finding a recording compensation parameter on the bases of the first distance difference D 2 and the second distance difference D 3 ; compensating a signal recording waveform for the information recording medium on the basis of the recording compensation parameter; finding a distribute on of the first distance difference D 2 and a distribution of the second distance difference D 3 with respect to a plurality of samples of the reproduction signal; finding a mean value M 2 of the first distance difference D 2 and a standard deviation σ 2 of the distribution of the first distance difference D 2 , and a mean value M 3 of the second distance difference D 3 and a standard deviation σ 3 of the distribution of the second distance difference D 3 ; finding a recording compensation parameter Ec from a relationship of (−σ 2 *M 3 +σ 3 *M 2 )/(σ 2 +σ 3 ); and compensating a signal recording waveform for the information recording medium on the basis of the recording compensation parameter Ec.