Method and apparatus for determining high order polynomials for linearization of position signals
AssigneeSeagate Technology LLC
InventorsKianKeong Ooi, WingKong Chiang, Lincheng Xiu, SiokYin Tan, YangQuan Chen
Life of this patent
Estimating the term…
Abstract
A method and storage device are provided for initializing a polynomial linearizer in the storage device. The linearizer is initialized by identifying the coefficients of the linearizer polynomial. To reduce the computational intensity of this process, orthogonal-type coefficients for at least two orthogonal polynomials are identified, where the linearizer polynomial is formed as the sum of the orthogonal polynomials. The orthogonal-type coefficients are then combined to identify linearizer coefficients for the linearizer polynomial.
Claims19
A method of initializing a polynomial linearizer in a storage device, the method comprising steps of:
- (a) identifying orthogonal-type coefficients for at least two orthogonal polynomials;
- (b) combining the orthogonal-type coefficients to identify linearizer coefficients for a polynomial formed from the sum of the at least two orthogonal polynomials;
- and
- (c) applying the linearizer coefficients to the polynomial linearizer to initialize the polynomial linearizer.
A data storage device for retrieving information from a storage medium, the data storage device comprising:
- a head that produces a position signal;
- a polynomial linearizer that converts the position signal into a position based on a linearizer polynomial having linearizer coefficients;
- and
- a coefficient calculator that identifies the linearizer coefficients of the linearizer polynomial by identifying orthogonal-type coefficients for orthogonal polynomials and converting the orthogonal-type coefficients into the linearizer coefficients.
A disc drive storage device for retrieving information from a storage medium, the disc drive storage device comprising:
- an actuator and head assembly that moves a head over the storage medium and generates a position signal from the storage medium;
- and
- position signal linearizer means that form a linearizer polynomial by identifying coefficients for orthogonal polynomials and converting the coefficients for the orthogonal polynomials into coefficients for the linearizer polynomial and that use the linearizer polynomial to identify a head position from the position signal.
Dependencies are inferred from the claim text.