Compensating tracking error signal offset in optical tape storage systems
AssigneeOracle International Corporation
InventorsScott David Wilson, Hua Zhong
Life of this patent
Estimating the term…
Abstract
Operations include compensating for a Tracking Error Signal (TES) offset in an optical tape drive. The tracking error offset compensation system detects a control signal for controlling movement of an optical head across a surface of a tape. The tracking error offset compensation system computes an estimated movement of the optical head, based on the initial control signal. The tracking error offset compensation system determines an estimated TES offset, based on the estimated movement of the optical head. The tracking error offset compensation system uses the estimated TES offset to correct a TES. The tracking error offset compensation system transmits the corrected TES, for controlling additional movement of the optical head.
Claims20
A method for compensating a tracking error signal offset, the method comprising the steps of:
- detecting an initial control signal for controlling movement of an optical head across a surface of a tape;
- computing an estimated movement of the optical head based on the initial control signal;
- based on the estimated movement of the optical head, determining a tracking error signal offset;
- measuring a lateral position of the optical head with respect to a width of a data track subsequent to application of the initial control signal;
- based on the measured lateral position of the optical head, determining a tracking error signal;
- applying the tracking error signal offset to the tracking error signal, to obtain a modified tracking error signal;
- and
- using the modified tracking error signal as a new control signal for controlling additional movement of the optical head.
A non-transitory computer readable medium comprising instructions which, when executed by one or more hardware processors, causes performance of operations comprising:
- detecting an initial control signal for controlling movement of an optical head across a surface of a tape;
- computing an estimated movement of the optical head based on the initial control signal;
- based on the estimated movement of the optical head, determining a tracking error signal offset;
- measuring a lateral position of the optical head with respect to a width of a data track subsequent to application of the initial control signal;
- based on the measured lateral position of the optical head, determining a tracking error signal;
- applying the tracking error signal offset to the tracking error signal, to obtain a modified tracking error signal;
- and
- using the modified tracking error signal as a new control signal for controlling additional movement of the optical head.
A system comprising:
- at least one device including an optical head;
- the system configured to perform operations comprising:
- detecting an initial control signal for controlling movement of the optical head across a surface of a tape;
- computing an estimated movement of the optical head based on the initial control signal;
- based on the estimated movement of the optical head, determining a tracking error signal offset;
- measuring a lateral position of the optical head with respect to a width of a data track subsequent to application of the initial control signal;
- based on the measured lateral position of the optical head, determining a tracking error signal;
- applying the tracking error signal offset to the tracking error signal, to obtain a modified tracking error signal;
- and
- using the modified tracking error signal as a new control signal for controlling additional movement of the optical head.
Dependencies are inferred from the claim text.