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US 8,797,673 B2Granted
Adaptive lattice predictive filter
AssigneeSeagate Technology LLC
InventorLou Supino
Life of this patent
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Abstract
An implementation of a circuit disclose herein comprises a vibration sensor circuit that generates a sensor signal from a disturbance signal, a lattice filter circuit that decorrelates the sensor signal to generate orthogonal backward prediction errors, and a multiple regression filter that estimates a disturbance correction signal using the orthogonal backward prediction errors.
Claims18
A method comprising:
- decorrelating a sensor signal using a lattice filter to generate orthogonal backward prediction errors;
- and
- estimating a disturbance correction signal using the orthogonal backward prediction errors.
A circuit comprising:
- a sensor circuit that generates a sensor signal from a disturbance signal;
- a phase-normalization filter that normalizes the phase of the sensor signal;
- a lattice filter circuit that decorrelates the phase-normalized sensor signal to generate orthogonal backward prediction errors;
- and
- a multiple regression filter that estimates a disturbance correction signal using the orthogonal backward prediction errors.
2 more elements
A servo control circuit, comprising:
- a sensor circuit that generates a sensor signal from a disturbance signal related to a device;
- a lattice predictor circuit comprising a plurality of lattice stages, wherein the lattice predictor circuit receives the sensor signal as an input and each stage of the plurality of lattice stages generates a backward prediction error;
- a multiple regression filter comprising a plurality of regression stages, wherein the backward prediction error output from each stage of the plurality of lattice stages is input to a corresponding stage of the plurality of regression stages, and wherein the multiple regression filter generates a disturbance correction signal;
- a combination module adapted to combine a servo signal with the disturbance correction signal to generate a combine control signal;
- and
- an actuator module adapted to generate an actuator signal to control an actuator arm of a disc drive in response to the combined control signal.
3 more elements
Dependencies are inferred from the claim text.