Patent ID: 6831806
Filing Date: 2004-12-14
Classification: G11B

Abstract:
A method to calibrate a servo sensor disposed on a magnetic tape head disposed adjacent a magnetic tape moving along a tape path, wherein said magnetic tape includes at least one servo edge comprising an interface between a first recorded signal and a second recorded signal, wherein said servo sensor detects said first recorded signal and said second recorded signal, and wherein an independent position sensor provides an IPS signal comprising the lateral position of said tape head with respect to the tape path, wherein (n) is initially set to 1, said method comprising the steps of:providing the (n)th positioning signal, wherein said (n)th positioning signal comprises a positioning signal frequency, the (n)th amplitude, and the (n)th DC offset; moving said tape head alternatingly in a first direction and an opposing second direction along a first axis as said tape moves along a second axis, wherein said first axis and said second axis are substantially orthogonal, wherein the position of said magnetic head along said first axis as a function of time is determined by said (n)th positioning signal; providing a servo signal, wherein said servo signal comprises the ratio of the detected first recorded signal and the detected second recorded signal; forming the (n)th measured servo signal waveform, wherein said (n)th measured servo signal waveform comprises a measured maximum servo signal ratio and a measured minimum servo signal ratio; establishing a target maximum servo signal ratio for said (n)th measured servo signal waveform; establishing a target minimum servo signal ratio for said (n)th measured servo signal waveform; determining if said measured maximum servo signal ratio substantially equals said target maximum servo signal ratio; operative if said measured maximum servo signal ratio substantially equals said target maximum servo signal ratio, determining if said measured minimum servo signal ratio substantially equals said target minimum servo signal ratio; operative if said measured minimum servo signal ratio substantially equals said target minimum servo signal ratio, forming the (n)th filtered servo signal waveform using said (n)th measured servo signal waveform; providing an IPS signal; forming the (n)th measured IPS signal waveform; forming the (n)th filtered IPS signal waveform; forming the (n)th X/Y datapoint array; calculating the (n)th transfer function; and saving said (n)th transfer function.