Read channel apparatus for asynchronous sampling and synchronous equalization

A read channel, comprising:

• an asynchronous analog to digital converter to asynchronously sample an analog signal formed by reading a data track at a rate greater than the first rate, wherein said data track was written to a data storage medium at a first rate;
• an upsampler to oversample in the asynchronous domain said analog signal at a rate greater than said first rate, wherein said upsampler is interconnected with said asynchronous analog to digital converter;
• an interpolator interconnected with said upsampler;
• a fractionally-spaced equalizer interconnected with said interpolator, wherein said interpolator provides interpolated samples to said fractionally-spaced equalizer at an interpolation rate, and wherein said fractionally-spaced equalizer forms synchronous equalized samples at an equalization rate, wherein said interpolation rate is greater than or equal to said equalization rate, and wherein said interpolation rate is greater than said first rate;
• a gain control module interconnected with said fractionally-spaced equalizer;
• and
• a sequence detector interconnected with said gain control module.
• a first feedback circuit comprising a timing control circuit interconnected with said sequence detector and with said interpolator;
• a second feedback circuit comprising a least mean square update circuit interconnected with said sequence detector and said fractionally-spaced equalizer.