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AssigneeInternational Business Machines Corporation
InventorsAlex Chliwnyj, David L. Swanson, Steven C. Wills
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A method to calibrate a servo sensor disposed on a magnetic tape head disposed adjacent a magnetic tape moving along a tape path. Applicants' method includes providing a positioning signal, where the positioning signal comprises a positioning signal frequency, an amplitude, and a DC offset. Applicants' method moves said tape head alternatingly in a first direction and an opposing second direction along a first axis as the tape moves along a second axis, where the first axis and the second axis are substantially orthogonal, and such that the position of the magnetic head along the first axis as a function of time is determined by the positioning signal. Applicants' method further provides a servo signal, where that servo signal comprises the ratio of the detected first recorded signal and the detected second recorded signal, and forms a measured servo signal waveform from that servo signal, where the measured servo signal waveform comprises a measured maximum servo signal ratio and a measured minimum servo signal ratio. Applicants' method further includes establishing a target maximum servo signal ratio for the measured servo signal waveform, establishing a target minimum servo signal ratio for the measured servo signal waveform, determining if the measured maximum servo signal ratio substantially equals the target maximum servo signal ratio, and determining if the measured minimum servo signal ratio substantially equals said target minimum servo signal ratio. If the measured maximum servo signal ratio substantially equals the target maximum servo signal ratio, and if the measured minimum servo signal ratio substantially equals said target minimum servo signal ratio, then Applicants' method forms a filtered servo signal waveform using the measured servo signal waveform. Applicants' method further includes providing an IPS signal comprising the lateral position of the tape head with respect to the tape path, forming a measured IPS signal waveform, and forming a filtered IPS signal waveform. Applicants' method then uses the filtered servo signal waveform and the filtered IPS signal waveform to form an X/Y datapoint array. Applicants' method further uses that X/Y datapoint array to calculate a transfer function, and then saves that transfer function for subsequent use.
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:
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:
An article of manufacture comprising a computer useable medium having computer readable program code disposed therein 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, the computer readable program code comprising a series of computer readable program steps to effect:
An article of manufacture comprising a computer useable medium having computer readable program code disposed therein 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, the computer readable program code comprising a series of computer readable program steps to effect:
A computer program product usable with a programmable computer processor having computer readable program code embodied therein 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, comprising:
A computer program product usable with a programmable computer processor having computer readable program code embodied therein 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, comprising:
Dependencies are inferred from the claim text.