Channel circuit with asynchronous sampling from an oversampled analog-to-digital converter

A method comprising:

• generating, by an analog-to-digital converter configured with a sample rate that is an integer multiple of a baud rate of a channel circuit, an oversampled digital signal from an analog data signal;
• interpolating, by a digital sample interpolator, multiple digital sample values from the oversampled digital signal to determine interpolated digital signal values;
• and
• determining, by the digital sample interpolator and for use by an iterative detector, a baud rate digital signal comprised of interpolated digital signal values selected at the baud rate of the channel circuit.

A data storage device comprising:

• a non-volatile storage medium;
• a channel circuit;
• means for generating, using a sample rate that is an integer multiple of a baud rate of the channel circuit, an oversampled digital signal from an analog data signal;
• means for interpolating multiple digital sample values from the oversampled digital signal to determine interpolated digital signal values;
• means for determining a baud rate digital signal comprised of interpolated digital signal values selected at the baud rate of the channel circuit;
• and
• means for determining timing for iterative detection of data bits from the baud rate digital signal based on a target timing, wherein the target timing is based on alignment of the selected interpolated digital signal values with data bit representations from the analog data signal.

A channel circuit, comprising:

• an analog-to-digital converter configured with a sample rate that is an integer multiple of a baud rate of the channel circuit to generate an oversampled digital signal from an analog data signal;
• a digital sample interpolator configured to:
• receive the oversampled digital signal;
• interpolate multiple digital sample values from the oversampled digital signal to determine interpolated digital signal values;
• and
• output a baud rate digital signal comprised of interpolated digital signal values selected at the baud rate of the channel circuit;
• and
• an anti-aliasing filter configured to:
• receive the oversampled digital signal from the analog-to-digital converter;
• implement a stop-band for the oversampled digital signal;
• and
• output the oversampled digital signal to the digital sample interpolator.