Detection of recorded data employing interpolation with gain compensation

A method of detecting data in a sample sequence read from a recording channel comprising the steps of:

• (a) generating one or more interpolated sample sequences from the read sample sequence, wherein each interpolated sample sequence has a different corresponding phase relative to the read sample sequence;
• (b) generating a distance measure between a portion of each sample sequence and an ideal sample sequence, wherein the ideal sample sequence corresponds to peaks in the data;
• (c) generating gain error information for the portion of each sample sequence;
• (d) selecting either the read sample sequence or one of the interpolated sample sequences based on the minimum distance measures for use in detecting the data;
• (e) generating a gain error metric (GEM) for the selected sample sequence from the corresponding gain error information;
• and
• (f) adjusting the read sample sequence based on the GEM.

A computer-readable medium having stored thereon a plurality of instructions, the plurality of instructions including instructions which, when executed by a processor, cause the processor to implement a method for detecting data in a sample sequence read from a recording channel, the method comprising the steps of:

• (a) generating one or more interpolated sample sequences from the read sample sequence, wherein each interpolated sample sequence has a different corresponding phase relative to the read sample sequence;
• (b) generating a distance measure between a portion of each sample sequence and an ideal sample sequence, wherein the ideal sample sequence corresponds to peaks in the data;
• (c) generating gain error information for the portion of each sample sequence;
• (d) selecting either the read sample sequence or one of the interpolated sample sequences based on the minimum distance measures for use in detecting the data;
• (e) generating a best gain error metric (GEM) for the selected sample sequence from the corresponding gain error information;
• and
• (f) adjusting the read sample sequence based on the GEM.