Optical data access apparatus and method thereof
AssigneeMediatek Inc.
InventorsChih Yuan Wang, Shih-Jung Chiu, Fu Jung Chen
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Abstract
A method for controlling an OPU and an optical data access apparatus are provided. A signal generator is configured to generate a servo signal in response to data access. A comparator is configured to compare a threshold level and the servo signal, and generate a control level if a level of the servo signal against the threshold level when the OPU is controlled. An adjustment unit is configured to adjust a control signal according to the control level. The OPU is controlled according to the adjusted control signal.
Claims10
A method for controlling an optical pick-up (OPU), comprising steps of:
- monitoring a servo signal;
- generating a control level if a level of the servo signal crosses a threshold level when the OPU is controlled by a control signal;
- reducing the control signal according to the control level to generate an adjusted control signal;
- and
- controlling the OPU by the adjusted control signal,
- wherein the step of reducing the control signal according to the control level to generate an adjusted control signal comprises following substeps:
- receiving a control signal to determine whether the OPU is able to access data correctly, wherein the control signal is a focus error (FE) signal;
- and
- obtaining an adjusted control signal by subtracting the control level from the FE signal.
An optical data access apparatus, comprising:
- an OPU for accessing data from an optical disc;
- a signal generator for generating a servo signal in response to the access, said signal generator further generating an FE signal to determine whether the OPU is able to access data correctly when the OPU accesses the data from the optical disc, wherein the FE signal is the control signal and is transmitted to the adjustment unit, and the adjustment unit shifts a level of the FE signal by subtracting the control level;
- a comparator for comparing the servo signal with a threshold level, and generating a control level if a level of the servo signal crosses the threshold level when the OPU is controlled by a control signal;
- and
- an adjustment unit for reducing the control signal according to the control level to generate an adjusted control signal;
- wherein the OPU is controlled by the adjusted control signal.
Dependencies are inferred from the claim text.