Patent ID: 6304400
Filing Date: 2001-10-16
Classification: G11B

Abstract:
A system for dropout compensation of an actual read signal produced by reading digital magnetic tape comprising:an adaptive filter receiving the actual read signal, the adaptive filter operative to produce an adaptive filter output based on the actual read signal and a plurality of multiplicative weighting factors, each weighting factor based on an error signal and on the actual read signal, the i.sup.th multiplicative weighting factor W.sub.i (n) is calculated asW.sub.1 (n)=W.sub.i (n-1)-2k.multidot.error(n-1).multidot.sig(n-1-i)where error( ) is the error signal sig( ) is the actual read signal, k is a constant, and n is a present sample time;a detector receiving the adaptive filter output, the detector operable to output a binary signal indicating data written onto the magnetic tape;a shaping filter receiving the binary signal, the shaping filter operative to produce an ideal read signal representing a read signal resulting from writing and subsequently reading the binary signal without dropout; anda differencer in communication with the shaping filter and the adaptive filter, the differencer operative to determine he error signal as the difference between the ideal read signal and the adaptive filter output.