Optical Disc Device
There is provided an optical disc device capable of recording and reproducing a DVD-RAM disc, which can perform a control with stability at a high speed without being affected by a CAPA component. The optical disc device comprises an error signal detection unit for detecting an error signal from a signal component obtained from an optical pickup, a filter for removing a specific frequency component included in the error signal, a holding unit for temporarily holding the error signal, a switching unit for switching the destination of the error signal to either the filter or the holding unit, a servo control unit for controlling the optical pickup by using the error signal outputted from the filter or the holding unit, and a controller for adaptively controlling the switching timing of the switching unit in accordance with the specific frequency component included in the error signal.
1 . An optical disc device comprising:
an error signal detection unit for detecting an error signal from a signal component obtained from an optical pickup;
a filter for removing a specific frequency component included in the error signal;
a holding unit for temporarily holding the error signal;
a switching unit for switching the destination of the error signal to either the filter or the holding unit;
a servo control unit for controlling the optical pickup by using the error signal outputted from the filter or the holding unit; and
a controller for controlling the switching of the switching unit on the basis of the specific frequency component.
2 . An optical disc device as defined in claim 1 further including:
a jump judgment circuit for judging a focus jump operation and a track jump operation, and outputting a jump detection signal; and
said controller controlling the switching of the switching unit on the basis of the jump detection signal and the specific frequency component.
3 . An optical disc device as defined in claim 1 further including:
a pull-in judgment circuit for judging a focus pull-in operation and a tracking pull-in operation, and outputting a pull-in detection signal; and
said controller controlling the switching of the switching unit on the basis of the pull-in detection signal and the specific frequency component.
4 . An optical disc device as defined in claim 1 further including a seek operation detection circuit for judging a seek operation in a radial direction of a disc, and outputting a seek detection signal; and
said controller controlling the switching of the switching unit on the basis of the seek detection signal and the specific frequency component.
5 . An optical disc device as defined in claim 1 further including an ON/OFF judgment circuit for judging ON/OFF of a tracking control operation, and outputting a tracking ON/OFF detection signal; and
said controller controlling the switching of the switching unit on the basis of the tracking ON/OFF detection signal and the specific frequency component.
6 . An optical disc device as defined in claim 1 including:
a jump judgment circuit for judging a focus jump operation and a tracking jump operation, and outputting a jump detection signal;
a pull-in judgment circuit for judging a focus pull-in operation and a tracking pull-in operation, and outputting a pull-in detection signal;
a seek operation detection circuit for judging a seek operation in a radial direction of a disc, and outputting a seek detection signal; and
a tracking ON/OFF judgment circuit for judging ON/OFF of a tracking control operation, and outputting a tracking ON/OFF detection signal; and
said controller receiving the jump detection signal, the pull-in detection signal, the seek detection signal, and the tracking ON/OFF detection signal, and appropriately controlling the switching of the switching unit in accordance with the operating state of the optical disc device.
7 . An optical disc device comprising:
an error signal detection unit for detecting an error signal from a signal component obtained from an optical pickup;
a filter for removing a specific frequency component included in the error signal;
a holding unit for temporarily holding the error signal;
a servo control unit for controlling the optical pickup by using the error signal outputted from the filter or the holding unit;
a switching unit for switching the destination of the error signal outputted from the filter to either the servo control filter or the holding unit; and
a controller for controlling the switching of the switching unit on the basis of the specific frequency component.