Appeal No. 1997-1174
Application 08/353,681
The invention relates to an apparatus for generating a
digital compensated signal derived from an analog signal
generated by a magnetoresistive (MR) head in a disk drive
system. MR heads have a non-linear response to the magnitude
of flux as a function of the orientation of the flux. This
results in the signal generated by the MR head being
asymmetrical, that is, the magnitude of the positive portion
of the signal will be different from the magnitude of the
negative portion of the signal with all other factors being
constant except for the orientation of the flux. The
asymmetry of the signal further causes a baseline shift in the
signal due to the AC coupling employed in recovering the
signal generated by the MR head. Appellants’ invention
compensates for asymmetry and baseline shift in the signal
generated by a MR head.
Independent claim 12 is reproduced as follows:
12. An apparatus for generating a digital compensated
signal derived from an analog signal generated by a
magnetoresistive head in a magnetic memory system where said
analog signal has a baseline shift and has asymmetry in the
form of positive peaks and negative peaks in said analog
signal having different amplitudes, said apparatus comprising:
2
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