Abstract: The invention provides a method for determining the layer type of a blu-ray disk. First, a laser beam is focused on a target layer of the blu-ray disk. Reflection of the laser beam from the target layer is the detected to obtain a reflection signal. The reflection signal is then processed to generate a first tracking error signal and a second tracking error signal. Magnitudes of the first tracking error signal and the second tracking error signal are then measured. The magnitude of the second tracking error signal is then subtracted from the magnitude of the first tracking error signal to obtain a difference value. Finally, the layer type of the target layer is determined by comparing the difference value with the first predetermined threshold.

Abstract: The present invention provides an apparatus of an optical disc drive for adjusting a focus error signal. The apparatus includes a focus offset determining unit and an adjusting module. The focus offset determining unit is utilized for determining a target focus offset corresponding to a target condition, and the adjusting module is coupled to the focus offset determining unit and utilized for receiving the focus error signal and adjusting the focus error signal with the target focus offset to generate an adjusted focus error signal.

Abstract: The invention provides a method for performing a layer jump of a disk. First, a tracking error generation method is determined according to a layer type of a target layer when the layer jump is performed. A tracking error signal is then generated according to the tracking error generation method.

Abstract: The invention provides a method for determining the layer type of a blu-ray disk. First, a laser beam is focused on a target layer of the blu-ray disk. Reflection of the laser beam from the target layer is the detected to obtain a reflection signal. The reflection signal is then processed to generate a first tracking error signal and a second tracking error signal. Magnitudes of the first tracking error signal and the second tracking error signal are then measured. The magnitude of the second tracking error signal is then subtracted from the magnitude of the first tracking error signal to obtain a difference value. Finally, the layer type of the target layer is determined by comparing the difference value with the first predetermined threshold.

Abstract: A system and method for calibrating a recording track offset of an optical storage device accessing an optical storage medium of land/groove type. The system includes: a tracking servo loop arranged to control tracking operations of an optical head of the optical storage device; a track offset control loop arranged to control the recording track offset for the tracking servo loop; a controller arranged to enable a latest value of the recording track offset to be a readout value for utilization in a recording process performed later; and a comparator arranged to compare a recording length with a threshold value and generate a flag to represent whether the recording length is a long recording length, wherein the latest value is derived from the track offset control loop.

Abstract: The invention provides a driving circuit for driving a laser diode of a pickup head. In one embodiment, the driving circuit comprises an automatic power control (APC) module, a clamp value determination unit, and a clamp circuit. The automatic power control module generates at least one power control signal. The clamp value determination unit dynamically determines at least one clamp value corresponding to the power control signal when the pickup head accesses an optical storage medium. The clamp circuit clamps the power control signal according to the clamp value to obtain a clamped power control signal. A driving signal for driving the laser diode can then be generated according to at least the clamped power control signal.

Abstract: A method for calibrating a recording track offset of an optical storage device accessing an optical storage medium of a land and groove recording/reproduction type includes: setting at least one control parameter of a track offset control loop of the optical storage device to drive the track offset control loop to enter an first state; and recording data onto the optical storage medium with the track offset control loop being enabled to derive the latest value of the recording track offset, where the track offset control loop is utilized for controlling the recording track offset. The method further includes setting the control parameter to drive the track offset control loop to enter a second state, where a loop response of the track offset control loop in the first state is different from that in the second state.

Abstract: The present invention provides an apparatus of an optical disc drive for adjusting a focus error signal. The apparatus includes a focus offset determining unit and an adjusting module. The focus offset determining unit is utilized for determining a target focus offset corresponding to a target condition, and the adjusting module is coupled to the focus offset determining unit and utilized for receiving the focus error signal and adjusting the focus error signal with the target focus offset to generate an adjusted focus error signal.

Abstract: Disclosed is a system for detecting a location of an optical pick-up head on an optical disk, and the optical disk comprises a plurality of sectors and the optical pick-up head emitting light to the optical disk and detected the reflected light from the optical disk. The system comprises: a signal generator, a counter, and a processing unit. The signal generator is coupled to the optical pick-up head for receiving a detecting signal from the optical pick-up head to generate a sector determined signal. The counter is coupled to the signal generator for receiving the sector determined signal and a period determined signal for counting a number according to the sector determined signal and the period determined signal; and a processing unit for receiving the number and calculating the location of the optical pick-up head accordingly.

Abstract: A system and method for calibrating a recording track offset of an optical storage device accessing an optical storage medium of land/groove type. The system includes: a tracking servo loop arranged to control tracking operations of an optical head of the optical storage device; a track offset control loop arranged to control the recording track offset for the tracking servo loop; a controller arranged to enable a latest value of the recording track offset to be a readout value for utilization in a recording process performed later; and a comparator arranged to compare a recording length with a threshold value and generate a flag to represent whether the recording length is a long recording length, wherein the latest value is derived from the track offset control loop.

Abstract: A method for calibrating a recording track offset of an optical storage device accessing an optical storage medium of a land and groove recording/reproduction type includes: setting at least one control parameter of a track offset control loop of the optical storage device to drive the track offset control loop to enter an first state; and recording data onto the optical storage medium with the track offset control loop being enabled to derive the latest value of the recording track offset, where the track offset control loop is utilized for controlling the recording track offset. The method further includes setting the control parameter to drive the track offset control loop to enter a second state, where a loop response of the track offset control loop in the first state is different from that in the second state.

Abstract: Disclosed is a system for detecting a location of an optical pick-up head on an optical disk, and the optical disk comprises a plurality of sectors and the optical pick-up head emitting light to the optical disk and detected the reflected light from the optical disk. The system comprises: a signal generator, a counter, and a processing unit. The signal generator is coupled to the optical pick-up head for receiving a detecting signal from the optical pick-up head to generate a sector determined signal. The counter is coupled to the signal generator for receiving the sector determined signal and a period determined signal for counting a number according to the sector determined signal and the period determined signal; and a processing unit for receiving the number and calculating the location of the optical pick-up head accordingly.

Abstract: The present invention discloses a tilt adjustment system and method of an optical disk device with a pickup head, which includes a decoder for decoding the encoded information from an optical disk and checking whether error occurs during decoding. A decoding error calculator calculates a statistics corresponding to the decoding errors under the different tilts of the pickup head. A tilt control unit utilizes a specific algorithm to determine a decoding error rate, which is minimal than the other error rates within the statistics. Thus, an optimal tilt value can be decided upon the minimal error rate to adjust the tilt of the pickup head.

Abstract: A write power calibrating method and related apparatus for determining an optimum write power used for recording data onto a digital versatile disc is disclosed. The write power calibrating method includes recording a plurality of first data sets onto the digital versatile disc by utilizing a plurality of different write powers respectively; executing an parity code decoding procedure on a plurality of second data sets read from the digital versatile disc to determine a plurality of byte error numbers detected by utilizing a parity code of each of the second data sets, the second data sets corresponding to the first data sets written onto the digital versatile disc; and determining the optimum write power according to the byte error numbers of the second data sets.

Abstract: A method of controlling write power for recording data into sectors of an optical storage medium. The optical storage medium comprises a plurality of sectors, each having a header, a data recording area, and a redundant area. The method comprises sampling a write power output from an optical emitter when the redundant area of the sectors is pointed thereby; generating a write power control force according to a deviation of the sampled write power from an ideal write power corresponding to a write power command; and adjusting the write power according to the write power error control force. Additionally, the redundant area is not a gap section or a mirror region. A circuit and method for determining whether to carry out automatic power control or not during recording data on an optical storage medium are also disclosed.