The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2015
Filed:
Jun. 20, 2014
Quantum Corporation, San Jose, CA (US);
Turguy Goker, Solana Beach, CA (US);
Ming-Chih Weng, Los Angeles, CA (US);
Umang Mehta, Tustin, CA (US);
Ryan Taylor, Los Angeles, CA (US);
Quantum Corporation, San Jose, CA (US);
Abstract
A media drive includes a head, a servo signal processing circuit, an actuator and a processor. The head is positioned near a data storage medium, and includes a servo element. The servo signal processing circuit is coupled to the servo element to output a position error signal. The actuator controls a position of the head relative to the data storage medium. The processor communicates with the actuator and the servo signal processing circuit. The processor provides a filtered position error signal to the actuator to compensate for a position displacement between the head and the data storage medium. The filtered position error signal includes a sum of outputs from a first compensation filter and a second compensation filter that is each applied to the position error signal output. The compensation filters attenuate disturbance frequencies that contribute to the position displacement. Each of the compensation filters has a sampling rate relating to the respective disturbance frequency. In one embodiment, the disturbance frequencies are fixed frequencies. Alternatively, the first disturbance frequency is a fixed frequency and the second disturbance frequency is a dynamic frequency. Still alternatively, the disturbance frequencies are dynamic frequencies.