Patent ID: 7822569

Claim:
A specific-condition-section detection apparatus configured to detect a specific condition section in a data signal, the signal level of the specific condition section being closer to a predetermined signal level than to a reference level set for comparison, the apparatus comprising: signal correction means for correcting the data signal by replacing a specific segment of the data signal in which the signal level is further away from the predetermined signal level than from the reference level with another data signal segment having a signal level closer to the predetermined signal level than to the reference level, the specific segment of the data signal occurring during an interval that starts at a time at which the signal level of the data signal changes from the level closer to the predetermined signal level than to the reference level to the level further away from the predetermined signal level than from the reference level and which ends at a time at which the signal level of the data signal changes back from the level further away from the predetermined signal level than from the reference level to the level closer to the predetermined signal level than to the reference level; and determining means for determining whether the level of the corrected data signal is closer to the predetermined signal level than to the reference level, the specific condition section being detected based on the determination carried out by the determining means.