| 摘要 |
<p>Domain bloom, also known as asymmetry, is a systematic imperfection caused by the writing process in optical discs. During disc read-out it causes signal transitions to shift with respect to their nominal positions. State-of-the-art equalization and detection methods suffer significant performance losses if directly applied to replay signals with asymmetry. A non-linear model for replay signals with asymmetry is used for new equalization and detection techniques that are applicable to signals in the presence of asymmetry. Modifications are described of the threshold bit-detector, the run-length pushback bit-detector, and the PRML sequence detector, which have significant performance benefits. These benefits come at almost no additional cost with respect to existing detectors.</p> |
