MAGNETIC RECORDING DEVICE, AND METHOD AND DEVICE FOR AT LEAST REDUCING INFLUENCE OF ASYMMETRY ON DATA SIGNALS READ BY MAGNETIC RECORDING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an asymmetry compensator for measuring and correcting asymmetry in a magnetic recording device.;SOLUTION: The magnetic recording device includes a read head, an asymmetry compensator, a data decoder, and an analog-to-digital converter. The read head produces a read data signal that contains potential errors due to asymmetry. The read data signal is processed into a compensated data signal by the asymmetry compensator. The asymmetry compensator includes a power of two squaring device, a gamma amplifier, and a summing junction connected in a feed forward manner. The gamma amplifier uses an approach involving, for a positive isolated pulse, the amplitude of the positive pulse and the undershoot and, for a negative isolated pulse, the amplitude of the negative pulse and the overshoot. The approach further involves probabilities and weights in a weighted average to account for any variations with frequency. The approach may be performed in either the analog or digital domain.;COPYRIGHT: (C)2007,JPO&INPIT