Decision-free timing disturbance cancellation caused by HAMR laser power variation
AssigneeMarvell International Ltd.
InventorsJongseung Park, Michael Madden
Life of this patent
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Abstract
Embodiments described herein provide methods and systems for correcting a transient phase error induced while recording on a magnetic recording medium. An input signal is received and is distributed to a plurality of sinc filters. A respective phase-shifted signal is generated at each of the plurality of sinc filters by adding a corresponding predetermined amount of phase to the received signals. A respective score is assigned to each of the generated phase-shifted signals. The generated phase-shifted signal having the highest score is selected as the phase-corrected signal to compensate for the transient phase error induced while recording on the magnetic recording medium.
Claims20
A method for compensating for a transient phase error induced while recording on a magnetic recording medium, the method comprising:
- receiving an input signal;
- distributing the received signal to a plurality of filters;
- generating, at each of the plurality of filters, a respective phase-shifted signal by adding a corresponding predetermined amount of phase to the received signal;
- assigning a respective score to each of the generated phase-shifted signals;
- and
- selecting the generated phase-shifted signal having the highest score as the phase-corrected signal to compensate for the transient phase error induced while recording on the magnetic recording medium.
An apparatus for compensating for a transient phase error induced while recording on a magnetic recording medium, the apparatus comprising:
- control circuitry configured to:
- receive an input signal;
- and
- distribute the input signal to a plurality of filters;
- a plurality of filters configured to receive the input signal from the control circuitry, the plurality of filters each being configured to generate a respective phase-shifted signal by adding a corresponding predetermined amount of phase to the received signal;
- a phase detector configured to assign a respective score to each of the generated phase-shifted signals;
- and
- a multiplexer (MUX) configured to select the generated phase-shifted signal having the highest score as the phase-corrected signal to compensate for the transient phase error induced while recording on the magnetic recording medium.
Dependencies are inferred from the claim text.