Patent ID: 7271971
Filing Date: 2007-09-18
Classification: G11B

Abstract:
1. Logic for dynamically adapting an equalizer of a magnetic tape read channel, said equalizer having at least one adjustable tap, said equalizer equalizing input read signals, and providing output signals, comprising: a detector configured to sense said equalizer output signals that are offset from at least one desired value, and configured to signal said sensed offset equalizer output signals as amplitude independent error signals; and feedback logic configured to feed back said signaled sensed amplitude independent errors to at least one adjustable tap of said equalizer; wherein said detector is configured to sense the polarities of said offset equalizer output signals from said at least one desired value, and configured to signal said sensed offset equalizer output signals as amplitude independent error signals indicating said polarity of said offset; wherein said feedback logic additionally weights said amplitude independent error signals; wherein said equalizer is configured to operate in an asynchronous domain having a first sample rate, and said equalizer comprises a plurality of taps arranged in accordance with said sample rate; wherein said detector is configured to operate in a synchronous domain having a second sample rate less than said first sample rate, configured to sense said equalizer output signals that are offset from at least one synchronous desired value, and configured to signal said sensed offset equalizer output signals as amplitude independent error signals; and wherein said feedback logic is configured to adjust said feed back to said plurality of taps to match the alignment of said amplitude independent error signals to said taps of said equalizer.