| 摘要 |
A pre-pit signal detecting apparatus is used in an information recording apparatus for recording record information onto a record medium on which record control information for controlling a recording operation is recorded in advance by forming a pre-pit on the record medium, and detects a pre-pit signal corresponding to the pre-pit when the information recording apparatus records the record information onto the record medium. The pre-pit signal detecting apparatus is provided with: an extracting device, to which a reproduction signal of the record medium is inputted, for extracting and outputting a predetermined signal component, which is used for detecting the pre-pit signal, out of the inputted reproduction signal; an input controlling device for inputting a standard signal, which is set in advance, to the extracting device in place of the reproduction signal before the pre-pit signal is detected and inputting the reproduction signal to the extracting device when the pre-pit signal is detected; a phase difference detecting device for comparing the standard signal outputted by the extracting device with the standard signal inputted by the input controlling device, and for detecting a phase difference generated between the compared standard signals due to an extracting operation of the extracting device before the pre-pit signal is detected; and a pre-pit detecting device for detecting the pre-pit signal on the basis of the extracted predetermined signal component while canceling the detected phase difference.
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