Marvell International Assigned Two Patents

Plant gain calibration for optical storage servo system
Marvell International Ltd., Hamilton, Bermuda, has been assigned a patent (8,531,935) developed by Yuan Zheng, Fremont, CA, Alex Chiang, Taipei, Taiwan, and Enya Cheng, San Jose, CA, for a “plant gain calibration for an optical storage servo system.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Aspects of the disclosure provide a method for calibrating gains of an optical storage servo system having a plant. The method includes translating a first signal of the plant from a time domain effort signal into a frequency domain effort signal, translating a second signal of the plant from a time domain error signal into a frequency domain error signal, determining a first gain of the optical storage servo system based on the first signal and the second signal, comparing a third signal from an optical disk of the optical storage servo system with a predetermined threshold, and asserting a defect flag when the third signal drops below the predetermined threshold to avoid calibrating the first gain based on the first signal and the second signal.”

The patent application was filed on Aug. 22, 2012 (13/591,499).

Radial and tangential tilt calibration of optical storage systems
Marvell International Ltd., Hamilton, Bermuda, has been assigned a patent (8,553,510) developed by Mats Oberg, Cupertino, CA, Zachary Keirn, Loveland, CO, and Christopher Painter, Longmont, CO, for a “method and system for radial and tangential tilt calibration of optical storage systems.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “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.”

The patent application was filed on Aug. 9, 2012 (13/570,657).