Method and system for radial and tangential tilt calibration of optical storage systems
AssigneeMarvell International Ltd.
InventorsMats Oberg, Zachary Keirn, Christopher Painter
Life of this patent
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Abstract
A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components depending on which detection area detects the component, measuring a value of a signal characteristic, such as signal-to-noise ratio, of two signals with different sets of weighting factors, and determining an adjustment factor to the radial tilt as a function of the of the measured signal characteristic values.
Claims19
A method of adjusting a tilt of an optical detection unit (ODU), comprising:
- generating a plurality of signals based on sums of a plurality of detection signals wherein the plurality of detection signals are adjusted by a plurality of weighting factors, which are non-zeros, corresponding to each detection signal received from the ODU;
- measuring a plurality of values for a plurality of signal characteristics of the plurality of signals;
- calculating an amount of tilt adjustment as a function of at least two of the values;
- and
- adjusting the tilt of the ODU based on the amount of tilt adjustment.
An optical disc reading system, comprising:
- at least one or more circuitries to generate a plurality of signals based on sums of a plurality of detection signals wherein the plurality of detection signals are adjusted by a plurality of weighting factors, which are non-zeros, corresponding to each detection signal received from an optical detection unit (ODU);
- circuitry to measure a plurality of values for a plurality of signal characteristics of the signals;
- circuitry to calculate a tilt adjustment factor as a function of at least two of the values;
- and
- circuitry to adjust a tilt of the ODU based on the tilt adjustment factor.
Dependencies are inferred from the claim text.