Systems and methods for low latency media defect detection

摘要

Various embodiments of the present invention provide systems and methods for media defect detection. For example, a media defect detection systems is disclosed that includes a data input derived from a medium, a fast envelope calculation circuit that receives the data input and provides a fast decay envelope value based on the data input, a slow envelope calculation circuit that receives the data input and provides a slow decay envelope value based on the data input, and a media defect detection circuit. The media defect detection circuit receives the slow decay envelope value and the fast decay envelope value, calculates a ratio value of the fast decay envelope value to the slow decay envelope value, and asserts a defect output based at least in part on the comparison of the ratio value to a defect threshold value.

主权项

1. A data detection system, wherein the data detection system comprises:
an analog input signal derived from a medium; an analog to digital converter, wherein the analog to digital converter is operable to receive the analog input signal and to provide a series of digital samples corresponding to the analog input signal; a data detector circuit, wherein the data detector circuit is operable to perform a data detection algorithm on the digital sample to provide a detected output, and wherein the data detector circuit is operable to provide an adaptive feedback signal that indicates a difference between the digital sample and the detected output and is used to drive an adaptive feedback loop; a media defect detector circuit, wherein the media defect detector circuit is operable to receive the digital sample, and wherein the media defect detector circuit is operable to determine whether the analog input signal is derived from a defective portion of the medium based in part on the digital sample and to assert a defect output; and wherein the adaptive feedback loop is disabled when the defect output is asserted.