Systems and methods for processing data with linear phase noise predictive filter
AssigneeLSI Corporation
InventorsLu Lu, Jianzhong Huang, Haitao Xia
Life of this patent
Estimating the term…
Abstract
Systems, methods, devices, circuits for data processing, and more particularly to systems and methods for data processing with a linear phase noise predictive filter. A data processing system includes an equalizer circuit operable to filter a digital data input to yield equalized data, a linear phase noise predictive finite impulse response filter operable to filter the equalized data to yield filtered data, and a data detector circuit operable to apply a data detection algorithm to the filtered data to yield a detected output. The greatest tap coefficient for the linear phase noise predictive finite impulse response filter is at a center tap.
Claims20
A data processing system comprising:
- an equalizer circuit operable to filter a digital data input to yield equalized data;
- a linear phase noise predictive finite impulse response filter operable to filter the equalized data to yield filtered data, wherein a greatest tap coefficient for the linear phase noise predictive finite impulse response filter is at a center tap, wherein the linear phase noise predictive finite impulse response filter comprises an even number of taps, and wherein the center tap comprises a later of two middle taps in the even number of taps;
- and
- a data detector circuit operable to apply a data detection algorithm to the filtered data to yield a detected output.
A method for data processing, comprising:
- equalizing a digital data input to yield equalized data;
- performing noise predictive filtering on the equalized data with a linear phase function to yield filtered data;
- applying a data detection algorithm to the filtered data to yield a detected output;
- and
- generating finite impulse response tap coefficients to be used in the noise predictive filtering based in part on the equalized data and on a signal derived from the filtered data, wherein a largest of the finite impulse response tap coefficients corresponds with a center tap, and wherein the center tap comprises a later of two middle taps in an even number of taps for a linear phase noise predictive finite impulse response filter.
A storage device, comprising:
- a storage medium;
- a head assembly disposed in relation to the storage medium and operable to provide a sensed signal corresponding to a data set on the storage medium;
- and
- a read channel circuit including:
- an analog to digital converter operable to sample the sensed signal to yield digital data samples;
- an equalizer circuit operable to filter the digital data samples to yield equalized data;
- a linear phase noise predictive finite impulse response filter operable to filter the equalized data to yield filtered data, wherein a greatest tap coefficient for the linear phase noise predictive finite impulse response filter is at a center tap, wherein the linear phase noise predictive finite impulse response filter comprises an even number of taps, and wherein the center tap comprises a later of two middle taps in the even number of taps;
- and
- a data detector circuit operable to apply a data detection algorithm to the filtered data to yield a detected output.
Dependencies are inferred from the claim text.