Patent ID: 7035029

Claim:
An information recording/reading apparatus that reads information from a recording medium at a timing synchronized with a read signal by reproducing a clock used when recording the information with timing reproduction data, comprising: a signal delay unit that delays signal data read from the recording medium for a predetermined time, the signal data having timing reproduction data that is split and recorded in the recording medium by setting a middle portion of the timing reproduction data as an area for recording the information; and a frequency offset detecting unit that detects, during the predetermined time, a frequency offset that is a frequency difference between a clock of the read signal and an operation clock of the information recording/reading apparatus using the timing reproduction data that is split and recorded in the recording medium; wherein the timing reproduction data is cyclic waveform data divided into a plurality of blocks, a phase of the timing reproduction data that is split and recorded in the recording medium is continuous, and the frequency offset detecting unit detects the frequency offset based on a difference between a phase difference of a cyclic waveform of a leading block from a reference waveform and a phase difference of a cyclic waveform of an ending block from the reference waveform.