Systems and Methods for Enhanced Accuracy NPML Calibration

A method, the method comprising:

• storing a plurality of sample sets in a sample buffer;
• applying a data detection algorithm by a data detector circuit to each of the plurality of sample sets to yield respective detected outputs, wherein the data detector circuit includes at least one filter circuit;
• applying a data decoding algorithm by a data decoder circuit to each of the respective outputs to yield respective converged outputs;
• storing the respective converged outputs to an output buffer;
• determining that one of the respective converged outputs is available in the output buffer at the same time that a corresponding one of the plurality of sample sets is available in the sample buffer;
• and
• calculating an updated coefficient for the filter circuit using a data set pair including the one of the respective converged outputs and the corresponding one of the plurality of data sets.

A storage device, the 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 information on the storage medium;
• a read channel circuit including:
• an analog front end circuit operable to provide an analog signal corresponding to the sensed signal;
• an analog to digital converter circuit operable to sample the analog signal to yield a series of digital samples;
• an equalizer circuit operable to equalize the digital samples to yield a sample set;
• a sample buffer operable to maintain the sample set with other sample sets in a plurality of the sample sets;
• a data processing circuit, wherein the data processing circuit includes:
• a data detector circuit operable to apply a data detection algorithm to each of the plurality of sample sets to yield respective detected outputs, wherein the data detector circuit includes at least one filter circuit;
• and
• a data decoder circuit operable to apply a data decoding algorithm to each of the respective outputs to yield respective converged outputs;
• an output buffer operable to store the respective converged outputs;
• an availability determination circuit operable to determine that one of the respective converged outputs is available in the output buffer at the same time that a corresponding one of the plurality of sample sets is available in the sample buffer;
• and
• a filter calibration circuit operable to calculate an updated coefficient for the filter circuit using a data set pair including the one of the respective converged outputs and the corresponding one of the plurality of data sets.