Via Optical Solution, Inc.

Tian Holdings, LLC

Other

Yuan-Kun Hsiao

Luke Wen

A wobble clock generator with a protective mechanism that can avoid interference generated from a phase-modulated wobble signal. The wobble clock generator has an arithmetic/logic circuit and a phase-locked loop. The arithmetic/logic circuit calculates a period count value by counting a period of a wobble signal according to a reference clock, and compares an average value with the period count value for outputting a control signal. The phase-locked loop is electrically connected to the arithmetic/logic circuit for generating a wobble clock according to the control signal and the wobble signal. When the control signal corresponds to a first logic level, the phase-locked loop compares the wobble signal with the wobble clock to drive the wobble clock to be synchronized with the wobble signal. When the control signal corresponds to a second logic level, the phase-locked loop holds the wobble signal without synchronizing the wobble clock with the wobble signal.

Wobble clock generator and driving method thereof

An apparatus for adjusting the phase of a wobble clock including a phase adjusting circuit for receiving a wobble signal and a wobble clock to generate a phase adjusting value, and a frequency divider coupled to the phase adjusting circuit for adjusting the phase of the wobble clock according to the phase adjusting value.

Apparatus of adjusting wobble clock

A data slicer capable of dynamically adjusting a slice level according to a wobble signal retrieved from a DVD-R/RW disc. The data slicer has a peak hold circuit for generating a first output signal according to positive peaks of the wobble signal, a bottom hold circuit for generating a second output signal according to negative peaks of the first output signal, a bias circuit for utilizing a bias voltage to raise voltage levels of the second output signal to generate the slice level, and a comparator for comparing the wobble signal with the slice level to generate corresponding square wave signal.

Data slicer of dynamically adjusting slice level

An apparatus of phase-frequency detector for adjusting wobble clock signal and wobble signal in the same phase, comprising: a first logic gate, receiving a first protection signal and a second protection signal and outputting a third protection signal according to a logic operation; a first flip-flop, coupled to the first logic gate, outputting the third protection signal as a first output signal when the wobble clock trigger; a second flip-flop, coupled to the first logic gate, outputting the third protection signal as a second output signal when the wobble signal trigger; a second logic gate, coupled to the first and the second flip-flop, outputting a fourth protection signal according to a logic operation; a third logic gate, coupled to the second logic gate, receiving the third and the fourth protection signal, and outputting a fifth protection signal according to a logic operation; and a control signal generator, receiving the wobble clock, the input signal, and the fifth protection signal and determining whether adjusting the phase of the wobble signal and the wobble clock according to the logic level of the fifth protection signal.

Apparatus of phase-frequency detector

An apparatus for generating a wobble clock includes an operation circuit for receiving a wobble signal and counting cycles of an oscillating signal during a cycle of the wobble signal to derive a cycle value and for comparing the cycle value with a preset cycle value to output a first protection signal, and a phase-locked loop circuit connected to the operation circuit for receiving the wobble signal, the wobble clock and the first protection signal, and determining whether the wobble clock is to be synchronized with the wobble signal according to the first protection signal.

Method and related apparatus for decoding information carried by wobble signals

Method and apparatus for use in an optical disk tilt servo system of an optical disk drive. The tilt servo system is for adjusting an angle between a surface of an optical disk and a pick-up head of the optical disk drive. The method includes: measuring focusing results of the optical disk at multiple locations and estimating tilt angles, i.e. deviation from the horizontal, of the surface of the optical disk according to a physical model that reflects that the optical disk has different tilt angles at different locations. The tilt servo system is calibrated accordingly.

Method and related optical disk accessing apparatus for calibrating optical disk tilt servo system according to non-constant relation between locations and tilt angles of optical disk

A method of identifying ADIP information through counting identical bits and different bits includes generating a wobble clock according to a wobble signal, generating a calculation result according to the wobble signal and the wobble clock, sampling the calculation result to generate a sampling signal and comparing each bit of the sampling signal with each bit of a bit stream containing an ADIP data, counting different bits corresponding to a predetermined logic value for generating a first bit count, and counting identical bits for generating a second bit count, and determining whether the calculation result corresponds to the ADIP data according to the first bit count and the second bit count.

Method of determining ADIP information through counting identical bits and different bits

When performing OPC, data including a plurality of first sequences and second sequences with specified contents are written onto the optical disk. A read result corresponding to the written data is then read. The read result is high-pass filtered such that effects corresponding to the second sequences are contained in a portion of the read result corresponding to the first sequences. Since the first sequences have specified contents, the portion of the read result corresponding to the first sequences are detected, and the beta-parameter is evaluated only according to the portion of the read result corresponding to the first sequences.

Method and related apparatus for evaluating beta-parameter according to write-in result of portion of write-in data with specific content while performing optimal power control of optical disk drive

A method and the related apparatus for performing optimal power control of an optical disk drive includes reading a write-in data from an optical disk and generating a corresponding read result after the write-in data is written onto the optical disk with the default power, and accumulating a beta parameter according to a portion of the filtered read result whose level is higher than a first level and lower than a second level. The first level is substantially higher than the second level.

Method and related apparatus for evaluating beta-parameter according to results of read data sliced with different slicing levels while performing optimal power control of optical disk drive

An apparatus for generating wobble clock comprises: a comparing circuit and a phase lock loop. The comparing circuit generates a combining signal according to peak values of the wobble signal and compares the output signal with a reference voltage to output a control signal. The phase lock loop drives the wobble clock to be synchronized with the wobble signal if the protection signal corresponds to a first logic level, and stops driving the wobble clock to be synchronized with the wobble signal if the protect signal corresponds to a second logic level.

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Taipei Hsien, Taiwan

Yuan-Kun Hsiao