Importance

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Abstract

A waveform reconstructor is utilized in the read channel of an optical storage system in order to produce a high speed and reliable data output. Generally speaking, the waveform reconstructor provides readout signals from the optical storage media without utilizing a phase locked loop. In order to accomplish this, readout signals are first converted to digital signals, then provided to a digital equalizer for further signal conditioning. This equalizer use provides several advantages not available when PLL designs are utilized. Readout samples are then processed to determine a phase error, as compared with an ideally sampled signal. Once determined, this phase error allows for the reconstruction of the waveform, to create an output which is consistent with one which would have been sampled at precisely the correct time. The waveform reconstructor manages the calculated samples to determine whether actual asynchronous sampling is inconsistent with the anticipated samples. In order to make adjustments, where necessary, samples may be adjusted, inserted and/or skipped in order to accommodate for the calculated phase error. Following this processing, a reconstructed signal is then provided to a channel bit decoder for appropriate decoding of the bit stream.

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First Claim