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US 9,001,452 B2Granted
Head to media proximity detection
AssigneeSeagate Technology LLC
InventorsAntanas Daugela, Jon D. Trantham, Srinivas Tadepalli
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Abstract
In one implementation, a method and apparatus is provided for determining an active fly height setting for a transducer head from samples collected from a proximity sensor during less than a single revolution of a disc. Implementations of the method and system use adaptive discrete wavelet transform parameters generated from the collected samples to determine an active fly height setting for a transducer head.
Claims18
A method comprising:
- determining, from four decomposed parameters, an active fly height setting for a transducer head from samples collected from a proximity sensor during less than a single revolution of a disc using adaptive discrete wavelet transforms ADWT to generate the four decomposed parameters from collected samples.
An apparatus comprising:
- a transducer head having a proximity sensor;
- a disc;
- a processor configured to determine an active fly height setting for the transducer head using an adaptive discrete wavelet transforms (ADWT) process from samples collected from the proximity sensor during less than a single revolution of the disc.
An apparatus comprising:
- a disc;
- a transducer head;
- a thermal expansion device disposed proximate the transducer head;
- a proximity sensor configured to output analog data signals;
- a digitizer configured to convert the analog data signals from the proximity sensor to digital data;
- a memory configured to receive the digital data from the digitizer;
- an adaptive discrete wavelet transforms module configured to generate four decomposed signal energy related parameters from the digital data;
- and
- a processor configured to determine an active fly height setting for the transducer head using at least one of the four decomposed signal energy related parameters.
6 more elements
Dependencies are inferred from the claim text.