Abstract: An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank area, and at a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals.

Abstract: An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset, through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank area, and at a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals.

Abstract: An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset, through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank, area, and at. a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals.

Abstract: A method of using an RF-sum signal and a plurality of detection signals to determine a property of at least one header and selecting one of a plurality of carrier regions is disclosed. The RF-sum signal and the plurality of detection signals are produced according to the header. The method includes using the RF-sum signal to produce a protection range signal, which indicates the position of the header. The protection region signal is used to protect the plurality of detection signals and determine the property of the header and the correct carrier region.

Abstract: An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank area, and at a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals.

Abstract: An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank area, and at a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals.

Abstract: A phase difference between a first periodic signal, and a sample signal corresponding to a second periodic signal and having a predetermined signal resolution M is calculated in a phase comparing method. The sample signal is obtained by sampling the second periodic signal at a sampling frequency fs for one signal cycle of the second periodic signal when a frequency of the second periodic signal is not greater than an allowable sampling signal frequency fab equal to fs/M or by conducting at least one of sampling the second periodic signal at fs for more than one signal cycle of the second periodic signal, and generating interpolated values for the sample signal after sampling the second periodic signal at fs in accordance with whether or not M/N yields a remainder and whether or not N is a prime number when the frequency of the second periodic signal is greater than and is N times fab.

Abstract: The present invention provides a method for automatically tuning a pre-pit slicing level and a related apparatus. The pre-pit slicing level can be used for slicing a first signal generated by an optical storage device when reading an optical storage disc to identify at least one pre-pit signal within the first signal. The method includes finding a first maximum according to the first signal, and generating the pre-pit slicing level according to the first maximum so that the optical storage device is capable of identifying the pre-pit signal within the first signal.

Abstract: A method for tracking and focusing enhancement of disk drives and related devices. The method performs feedforward compensation for an output signal generated by a feedback compensator of a disk drive. The output signal is utilized for controlling a tracking position or a focusing position of a read/write module of the disk drive. The method includes obtaining the output signal, within which a dominant signal is a periodic wave corresponding to a tracking error or a focusing error of the disk drive, identifying a waveform of the dominant signal, generating a correction signal according to the waveform of the dominant signal, and superposing the correction signal on the output signal to correct the dominant signal.

Abstract: A phase difference between a first periodic signal, and a sample signal corresponding to a second periodic signal and having a predetermined signal resolution M is calculated in a phase comparing method. The sample signal is obtained by sampling the second periodic signal at a sampling frequency fs for one signal cycle of the second periodic signal when a frequency of the second periodic signal is not greater than an allowable sampling signal frequency fab equal to fs/M or by conducting at least one of sampling the second periodic signal at fs for more than one signal cycle of the second periodic signal, and generating interpolated values for the sample signal after sampling the second periodic signal at fs in accordance with whether or not M/N yields a remainder and whether or not N is a prime number when the frequency of the second periodic signal is greater than and is N times fab.

Abstract: A method for generating a phase-corrected radio frequency zero crossing (PKRFZC) signal includes generating a pseudo radio frequency zero crossing (PSRFZC) signal according to a track error (TE) signal of an optical storage device, and outputting the PSRFZC signal or an inverted signal of the PSRFZC signal as the PKRFZC signal according to variations of a phase difference between a track error zero crossing (TEZC) signal and an radio frequency zero crossing (RFZC) signal of the optical storage device. A value of the phase difference between the PKRFZC signal and the TEZC signal is 90 degrees. The lead or lag relationship between the PKRFZC signal and the TEZC signal follow the disc run-out during seeking.

Abstract: The present invention provides a method for automatically tuning a pre-pit slicing level and a related apparatus. The pre-pit slicing level can be used for slicing a first signal generated by an optical storage device when reading an optical storage disc to identify at least one pre-pit signal within the first signal. The method includes finding a first maximum according to the first signal, and generating the pre-pit slicing level according to the first maximum so that the optical storage device is capable of identifying the pre-pit signal within the first signal.

Abstract: An optical disc drive utilized for transferring data to and/or from a header-included land/groove optical disc includes a motor, a spindle, a focusing lens, a laser, a pickup head, a memory, and a control circuit. A header position signal is utilized as a mask to eliminate false track readings produced by passing headers in a track count signal, improving track count and allowing more precise control over the accelerative and braking radial forces applied to the pickup head during a jump. Additionally, the memory includes computer code to delay initiating and/or ending a jump when passing headers may interfere with normal seek operations and may prevent some jumps in the immediate vicinity of an upcoming G/L Switch Line.

Abstract: A method of using an RF-sum signal and a plurality of detection signals to determine a property of at least one header and selecting one of a plurality of carrier regions is disclosed. The RF-sum signal and the plurality of detection signals are produced according to the header. The method includes using the RF-sum signal to produce a protection range signal, which indicates the position of the header. The protection region signal is used to protect the plurality of detection signals and determine the property of the header and the correct carrier region.

Abstract: An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with respect to a first offset through the switch and then be output after a first gain unit performed proportional conversion, or designated to undergo signal reduction with respect to a second offset and then be output after a second gain unit performed proportional conversion. The switch is switched on/off in the light of the working status of the pick-up head, for example, seeking or tracking, at a data area or at a blank area, and at a groove area or at a land area, so as to choose different offsets and gains to have the conversion of the servo signals.

Abstract: An error compensation method and apparatus for an optical disk drive is disclosed, in which the error compensation method comprises the following procedures. First, an error signal showing the deviation of a focal point of the optical disk drive from a track is detected, and an error signal between the sledge and the actuator may also be detected, so as to produce the first sledge driving signal. Secondly, the error signal of the focal point deviating from the track, the error signal between the sledge and the actuator, the first sledge driving signal or their combination is/are selected as the basis for the sledge compensation, and the second sledge driving signal is generated according to the magnitude(s) of the selected signal(s). Subsequently, the second sledge driving signal is intermittently used for driving the sledge for error compensation.