Integrated circuit, information recording/reproducing apparatus, and signal processing method

An integrated circuit which acquires, in an information recording/reproducing apparatus including an optical pickup unit for receiving reflected light of laser light with which a recording medium has been irradiated and thereby generating an RF signal, at a restart of recording after a halt of recording, a data ID to be used as a reference for specifying a recording restart position in the recording medium, based on the RF signal, the integrated circuit comprising:

• a reproduced signal generation unit configured to generate a reproduced signal based on the RF signal, and including an equalizer circuit configured to cut a component of the RF signal exceeding a predetermined cutoff frequency and perform boosting to the RF signal based on a predetermined boost amount,
• wherein
• during a period from a start of the halt of recording to the restart of recording, an asymmetry value for a data-recorded region of the recording medium in which data has been recorded before the halt of recording is calculated, and a recording power after the restart of recording is calculated based on the calculated asymmetry value, and
• if the calculated asymmetry value is smaller than a first threshold, the predetermined boost amount is increased, and if the asymmetry value is larger than a second threshold, the predetermined boost amount is reduced.

A signal processing method in which in an information recording/reproducing apparatus including an optical pickup unit for receiving reflected light of laser light with which a recording medium has been irradiated and thereby generating an RF signal, a data ID to be used as a reference for specifying a recording restart position in the recording medium is acquired at a restart of recording after a halt of recording based on the RF signal, the method comprising of:

• a reproduced signal generation step of generating a reproduced signal based on the RF signal;
• and
• a data ID acquisition determination step of determining, at the restart of recording after the halt of recording, whether or not the data ID has been properly acquired, based on the reproduced signal,
• wherein
• if it is determined in the data ID acquisition determination step that the data ID has not been properly acquired, a reproduction parameter to be used for generating the reproduced signal in the reproduced signal generation step is adjusted.

A signal processing method in which in an information recording/reproducing apparatus including an optical pickup unit for receiving reflected light of laser light with which a recording medium has been irradiated and thereby generating an RF signal, a data ID to be used as a reference for specifying a recording restart position in the recording medium is acquired at a restart of recording after a halt of recording based on the RF signal, the method comprising of:

• a reproduced signal generation step of generating a reproduced signal based on the RF signal, the reproduced signal generating step including an equalizing step of cutting a component of the RF signal exceeding a predetermined cutoff frequency and performing boosting to the RF signal based on a predetermined boost amount,
• wherein
• during a period from a start of the halt of recording to the restart of recording, an asymmetry value for a data-recorded region of the recording medium in which data has been recorded before the halt of recording is calculated, and a recording power after the restart of recording is calculated based on the calculated asymmetry value, and
• if the calculated asymmetry value is smaller than a first threshold, the predetermined boost amount is increased, and if the asymmetry value is larger than a second threshold, the predetermined boost amount is reduced.