Combined DC restoration double detection and loops
AssigneeLSI Corporation
InventorsJongseung Park, Andrei E. Vityaev, Li Du
Life of this patent
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Abstract
A method of double detection in a perpendicular magnetic read channel is disclosed. The method generally includes the steps of (A) generating an intermediate signal by performing a first detection on an input signal of the perpendicular read channel, the first detection having a first error rate, (B) generating a statistics signal based on the intermediate signal, the statistics signal conveying noise statistics that depend on data in the input signal and (C) generating an output signal by performing a second detection on the input signal using the noise statistics to reduce a second error rate of the second detection compared with the first error rate, wherein the first detection is independent of the second detection.
Claims20
A method of double detection in a perpendicular magnetic read channel, comprising the steps of:
- (A) generating a first sequence of data by performing a first detection on a plurality of symbols in an input signal of said perpendicular magnetic read channel, said first detection having a first error rate associated with said data;
- (B) generating a plurality of estimations based on said first sequence of said data;
- (C) delaying said symbols;
- and
- (D) generating a second sequence of said data by performing a second detection on said delayed symbols, said second detection using said estimations to reduce a second error rate associated with said data compared with said first error rate, wherein said first detection is independent of said second detection.
A circuit comprising:
- a preliminary detection module configured to (i) generate a first sequence of data by performing a first detection on a plurality of symbols in an input signal of a perpendicular magnetic read channel, said first detection having a first error rate associated with said data and (ii) generate a plurality of estimations based on said first sequence of said data;
- and
- a main detection module configured to (i) delay said symbols and (ii) generate a second sequence of said data signal by performing a second detection on said delayed symbols, said second detection using said estimations to reduce a second error rate associated with said data compared with said first error rate, wherein said first detection is independent of said second detection.
A circuit comprising:
- means for (i) generating a first sequence of data by performing a first detection on a plurality of symbols in an input signal of a perpendicular magnetic read channel, said first detection having a first error rate associated with said data and (ii) generating a plurality of estimations based on said first sequence of said data;
- means for delaying said symbols;
- and
- means for generating a second sequence of said data by performing a second detection on said delayed symbols, said second detection using said estimations to reduce a second error rate associated with said data compared with said first error rate, wherein said first detection is independent of said second detection.
Dependencies are inferred from the claim text.