Asymmetric error correction apparatus and method, and clock...

Details Asymmetric error correction apparatus and method, and clock... Asymmetric error correction apparatus and method, and clock...

2005-11-08

2005-11-08

Chase, Shelly (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error detection for synchronization control

C714S789000

Reexamination Certificate

active

06964007

ABSTRACT:
An asymmetric error correction apparatus and method, and clock recovering apparatus and data recovering apparatus for a system for reading data from an optical recording medium such as a CD or DVD that has a multi-level input signal and irregular characteristic of zero-crossing transition. The signal inputted from the optical recording medium is digitized, and a zero-crossing detector extracts four sequential samples and detects a zero-crossing point from the two intermediate samples. An asymmetric error detector judges an asymmetric state and asymmetric polarity of the digital signal from a sum of the two side samples among the four samples if the zero-crossing point is detected. A correction section accumulates the judged asymmetric polarities, judges an asymmetric error of the digital signal if the accumulated value exceeds a predetermined threshold, and corrects the asymmetric error of the read signal caused by an inaccurate pit length.

REFERENCES:
patent: 5359631 (1994-10-01), Behrens et al.

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