Abstract: An apparatus includes a first circuit and a second circuit. The first circuit may be configured to generate status signals and an error signal in response to accessing a storage medium. The error signal provides a first value based on an accuracy of accessing the storage medium. The second circuit may be configured to offset the first value of the error signal to a second value to increase the accuracy of accessing said storage medium. The status signals include one or more of a data signal and a differential signal. In a first mode, an offset signal is generated in response to the data signal. In a second mode, the offset signal is generated in response to the differential signal.

Abstract: A method for demodulating a tracking error signal comprising the steps of (A) demodulating the tracking error signal when starting motion, (B) demodulating the tracking error signal after motion has started, and (C) demodulating the tracking error signal before and after lens motion stops.

Abstract: An apparatus includes a first circuit and a second circuit. The first circuit may be configured to generate status signals and an error signal in response to accessing a storage medium. The error signal provides a first value based on an accuracy of accessing the storage medium. The second circuit may be configured to offset the first value of the error signal to a second value to increase the accuracy of accessing said storage medium. The status signals include one or more of a data signal and a differential signal. In a first mode, an offset signal is generated in response to the data signal. In a second mode, the offset signal is generated in response to the differential signal.

Abstract: An apparatus comprising a focus controller, a photo-diode sensor, a data circuit, a focus error creation circuit and a focus offset circuit. The focus controller may be configured to control a lens in relation to a laser beam and allow the laser beam to focus on a disc. The photo-diode sensor may be configured to generate one or more photo-diode signals in response to the laser beam. The data circuit may be configured to generate one or more disc status signals in response to the one or more photo-diode signals. The focus error creation circuit may generate a focus error signal. The focus error signal may provide a first value based on a focus point of the laser beam. The focus offset circuit may be configured to offset the first value of the focus error signal to a second value in response to the disc status signals to allow the focus controller to move the lens to a position which will increase the focus point of the laser beam on the disc.

Abstract: A method for controlling a stepper motor in an optical disc system, comprising the steps of (A) measuring a static offset of a center error signal, (B) measuring a maximum value, minimum value and an average value of the center error signal in response to rotating the optical disc, (C) computing one or more upper threshold values and one or more lower threshold values of the center error signal, (D) sampling the center error signal, (E) comparing the center error signal to the one or more upper threshold values and to the one or more lower threshold values and (F) computing a control output to control the stepper motor in response to comparing the center error signal to the one or more upper and lower threshold values.

Abstract: An apparatus comprising a first circuit, a second circuit and a third circuit. The first circuit may be configured to (i) generate a read power signal and (ii) control power of a laser beam emitted from an optical pick-up circuit during a read process. The second circuit may be configured to (i) generate a first write power signal and (ii) control one or more power levels of the laser beam during a write process in response to a second write power signal. The third circuit may be configured to generate the second write power signal and a third write power signal in response to a target write signal.

Abstract: A method for demodulating a focusing error signal in an optical disc system, comprising the steps of (A) generating a beam strength signal and the focusing error signal, (B) sampling the beam strength signal and the focusing error signal at an appropriate sampling rate, (C) removing a static offset from the beam strength signal and the focusing error signal, (D) calibrating a peak-to-peak value of the beam strength signal and the focusing error signal, and (E) determining an appropriate phase to (i) demodulate the focusing error signal and (ii) calculate a vertical position of a lens in relation to a disc.

Abstract: A method for calibrating a center error signal in an optical disc system, comprising the steps of (i) measuring a peak-to-peak value of the center error signal, (ii) computing a nominal peak-to-peak value of the center error signal after locking to a particular track of an optical disc, (iii) computing the nominal peak-to-peak value of the center error signal for a run-out condition, and (iv) defining a calibration gain for the current value for the center error signal.

Abstract: A method for detecting and controlling disc tilt in an optical disc mechanism comprising the steps of (A) measuring a 2-dimensional displacement of an optical lens of the optical disc mechanism, (B) extracting an absolute value of a disc tilt angle in the optical disc mechanism based upon the 2-dimensional displacement and (C) controlling deflection of a tilt moving coil according to the absolute value of the disc tilt angle.

Abstract: A method for calibrating a center error signal in an optical disc system, comprising the steps of (i) measuring a peak-to-peak value of the center error signal, (ii) computing a nominal peak-to-peak value of the center error signal after locking to a particular track of an optical disc, (iii) computing the nominal peak-to-peak value of the center error signal for a run-out condition, and (iv) defining a calibration gain for the current value for the center error signal.

Abstract: A method for calibrating a center error signal in an optical disc system, comprising the steps of (i) measuring a peak-to-peak value of the center error signal, (ii) computing a nominal peak-to-peak value of the center error signal after locking to a particular track of an optical disc, (iii) computing the nominal peak-to-peak value of the center error signal for a run-out condition, and (iv) defining a calibration gain for the current value for the center error signal.

Abstract: An apparatus comprising a focus controller, a photo-diode sensor, a data circuit, a focus error creation circuit and a focus offset circuit. The focus controller may be configured to control a lens in relation to a laser beam and allow the laser beam to focus on a disc. The photo-diode sensor may be configured to generate one or more photo-diode signals in response to the laser beam. The data circuit may be configured to generate one or more disc status signals in response to the one or more photo-diode signals. The focus error creation circuit may generate a focus error signal. The focus error signal may provide a first value based on a focus point of the laser beam. The focus offset circuit may be configured to offset the first value of the focus error signal to a second value in response to the disc status signals to allow the focus controller to move the lens to a position which will increase the focus point of the laser beam on the disc.

Abstract: An apparatus comprising a lens, a stepper motor and a tracking error controller. The lens may be positioned in a sled housing. The stepper motor may be configured to (i) move the sled housing in response to a first control signal and (ii) vibrate the lens in response to moving the sled housing. The tracking error controller may be configured to lock the lens to any one of a particular number of disc tracks with a voice coil motor. The voice coil motor may be configured to minimize the vibration of the lens prior to locking the lens to any one of the particular number of disc tracks.

Abstract: An apparatus comprising a first circuit, a second circuit and a third circuit. The first circuit may be configured to (i) generate a read power signal and (ii) control power of a laser beam emitted from an optical pick-up circuit during a read process. The second circuit may be configured to (i) generate a first write power signal and (ii) control one or more power levels of the laser beam during a write process in response to a second write power signal. The third circuit may be configured to generate the second write power signal and a third write power signal in response to a target write signal.

Abstract: A method for demodulating a focusing error signal in an optical disc system, comprising the steps of (A) generating a beam strength signal and the focusing error signal, (B) sampling the beam strength signal and the focusing error signal at an appropriate sampling rate, (C) removing a static offset from the beam strength signal and the focusing error signal, (D) calibrating a peak-to-peak value of the beam strength signal and the focusing error signal, and (E) determining an appropriate phase to (i) demodulate the focusing error signal and (ii) calculate a vertical position of a lens in relation to a disc.

Abstract: A method for controlling a stepper motor in an optical disc system, comprising the steps of (A) measuring a static offset of a center error signal, (B) measuring a maximum value, minimum value and an average value of the center error signal in response to rotating the optical disc, (C) computing one or more upper threshold values and one or more lower threshold values of the center error signal, (D) sampling the center error signal, (E) comparing the center error signal to the one or more upper threshold values and to the one or more lower threshold values and (F) computing a control output to control the stepper motor in response to comparing the center error signal to the one or more upper and lower threshold values.

Abstract: A method for detecting and controlling disc tilt in an optical disc mechanism comprising the steps of (A) measuring a 2-dimensional displacement of an optical lens of the optical disc mechanism, (B) extracting an absolute value of a disc tilt angle in the optical disc mechanism based upon the 2-dimensional displacement and (C) controlling deflection of a tilt moving coil according to the absolute value of the disc tilt angle.

Abstract: A method for demodulating a tracking error signal comprising the steps of (A) demodulating the tracking error signal when starting motion, (B) demodulating the tracking error signal after motion has started, and (C) demodulating the tracking error signal before and after lens motion stops.

Abstract: A method for calibrating a center error signal in an optical disc system, comprising the steps of (i) measuring a peak-to-peak value of the center error signal, (ii) computing a nominal peak-to-peak value of the center error signal after locking to a particular track of an optical disc, (iii) computing the nominal peak-to-peak value of the center error signal for a run-out condition, and (iv) defining a calibration gain for the current value for the center error signal.