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Abstract

A method and apparatus for recovering data from an optical read channel provides for improved recording density by tolerating lower phase and amplitude margins. The method includes digitizing a plurality of samples of a first signal, clipping the digitized samples of the first signal, digitally differentiating the clipped digitized samples, determining the relative locations of signal polarity changes, and generating logical values for channel bits based, at least in part, on the relative locations of signal polarity changes. The apparatus for recovering data from an optical read channel includes a signal-level limiter, a digital differentiator coupled to the signal-level limiter, a min/max detector coupled to the digital differentiator, a zero-crossing detector coupled to the digital differentiator, an update signal generator coupled to the zero-crossing detector and the min/max detector, and a channel bit transition generator.

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First Claim