Patent ID: 6084924
Filing Date: 2000-07-04
Classification: G11B

Abstract:
A sample amplitude channel for reading coded values modulating an analog waveform and recorded at a synchronous rate on a tracked magnetic storage device comprising:an arrangement for generating a sequence of equalized waveform samples S.sub.j, S.sub.k, . . . asynchronously from said storage device;a first filter responsive to said waveform samples for interpolating midpoint values J.sub.j between each predecessor S.sub.j and successor sample S.sub.k and providing a sample sequence modified with the midpoint values, each midpoint value being a weighted average of the counterpart predecessor and successor samples;a second filter responsive to the modified sequence . . . , S.sub.j, J.sub.j, . . . for linearly interpolating estimates V of coded values at predicted synchronous points, each estimate of a coded value being a weighted average of a sample and a midpoint value as, for instance, one of the ordered pairs (S.sub.j, J.sub.j) or (J.sub.j, S.sub.k), bounding a predicted synchronous point; anda timing generator responsive to the linearly interpolated modified sequence for general indicia of the predicted synchronous point and applying said indicia to the second filter.