Baseline wander compensation for perpendicular recording
AssigneeMaxtor Corporation
InventorAra Patapoutian
Life of this patent
Estimating the term…
Abstract
Baseline wander is compensated for by processing a read channel waveform to produce an estimated data decision signal, updating an estimated baseline wander signal by filtering the estimated data signal to produce an estimate of an associated pulse tail, combining that estimate with a prior estimated baseline wander signal to produce an updated estimated baseline wander signal, and combining the updated estimated baseline wander signal with the incoming signal at a next sample time. The operations continue recursively for next signal samples.
Claims17
A method for compensating for baseline wander, the method including the steps of:
- A. processing a read channel waveform to produce an estimated data decision signal;
- B. updating an estimated baseline wander signal by filtering the estimated data signal to produce an estimate of the associated pulse tail and combining the result with a prior estimated baseline wander signal;
- C. compensating for baseline wander by combining a next signal sample with the updated estimated baseline wander signal;
- and
- D. repeating steps A-C using the updated estimated baseline wander signal as the estimated baseline wander signal.
A method of compensating for baseline wander, the method including the steps of:
- A. processing a read channel waveform to produce an estimated data signal and an estimated signal;
- B. combining the estimated signal with the read channel waveform to produce a residual signal;
- C. filtering the residual signal and the estimated data signal to produce an updated residual signal and an estimate of the associated pulse tail;
- and
- D. updating an estimated baseline wander signal by combining the estimate of the pulse tail, the updated residual signal and a prior estimated baseline wander signal;
- E. compensating for baseline wander by combining the updated estimated baseline wander signal with the read channel waveform at a next signal sample time;
- and
- F. repeating steps A-E using the updated estimated baseline wander signal as the estimated baseline wander signal.
Dependencies are inferred from the claim text.