Systems and methods for area efficient noise predictive filter calibration

A data storage device, the storage device comprising:

• a storage medium maintaining a representation of an input data set;
• an analog front end circuit operable to sense the representation of the input data set and to provide the input data set as an analog input;
• an analog to digital converter circuit operable to convert the analog input into a series of digital samples;
• an equalizer circuit operable to receive the series of digital samples to yield a data input;
• and
• a data processing circuit including:
• a noise predictive filter circuit operable to perform a noise predictive filtering process on a data input based upon a selector input to yield a noise predictive output, wherein the selector input is derived from a data detector output;
• a mean calculation circuit operable to average two or more instances of the noise predictive output to yield a mean output;
• a summation circuit operable to subtract the mean output from the noise predictive output to yield a sum output;
• and
• a filter tap adaptation circuit operable to adaptively calculate a filter tap based at least in part on a value derived from the data input and a value derived from the sum output.

A data transmission device, the data transmission device comprising:

• a receiver including a data processing circuit, wherein the data processing circuit includes:
• a noise predictive filter circuit operable to perform a noise predictive filtering process on a data input based upon a selector input to yield a noise predictive output, wherein the selector input is derived from a data detector output;
• a mean calculation circuit operable to average two or more instances of the noise predictive output to yield a mean output;
• a summation circuit operable to subtract the mean output from the noise predictive output to yield a sum output;
• and
• a filter tap adaptation circuit operable to adaptively calculate a filter tap based at least in part on a value derived from the data input and a value derived from the sum output.