Abstract: Example channel circuits, data storage devices, and methods for asynchronous sampling from an oversampled analog-to-digital converter are described. The channel circuit may include an analog-to-digital converter configured to generate an oversampled digital signal from an analog data signal using a sample rate that is an integer multiple of the baud rate of the channel circuit. A digital sample interpolator may then interpolate interpolated digital signal values from multiple signal values of the oversampled digital signal and select values at baud rate to generate a baud rate digital signal. The baud rate digital signal may be used by an iterative detector in a timing loop and, once a target timing is achieved, for the iterative detector to detect data bits from the interpolated digital signal.

Abstract: An auger cutter head includes a rotatable body that is mountable on an auger and a plurality of cutting assemblies spaced about the outer wall of the rotatable body to drill a hole in the ground as the auger cutter head is rotated and advanced into the ground. Two of the cutting assemblies include outside chisel bits positioned to ream or gauge the hole as the cutter head is rotated and advanced. All of the flighting sections, bit, blocks, and blade assemblies provided in the cutting assemblies are offset in a radially inward direction relative to the two outside chisel bits to reduce the wear and tear on those components. Each of the chisel bits is oriented to rotate relative to its bit block about a predetermined axis of rotation to reduce wear caused by uneven loading on the rotatable chisel bits during drilling of the hole.