Detecting anomalies in a scanning signal

Details Detecting anomalies in a scanning signal Detecting anomalies in a scanning signal

2007-05-01

2007-05-01

Edun, Muhammad (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044340, C369S053160

Reexamination Certificate

active

10524569

ABSTRACT:
An apparatus for scanning a track on a record carrier has a head (22) and front end circuitry (31) for scanning the track and generating scanning signals. A detection unit (32) detects anomalies in the scanning signal, for example for adjusting a tracking servo. The detection unit (32) calculates a mean value of the scanning signal and compares the mean value to a threshold for providing an anomaly detection signal (33). Further a classification unit (34) provides an indication of the type of defect for determining a suitable responsive or corrective action.

REFERENCES:
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patent: 6259663 (2001-07-01), Tateishi
patent: 2001/0055247 (2001-12-01), Tateishi et al.
patent: 0959559 (2000-03-01), None
patent: 62024477 (1987-07-01), None
patent: WO0017876 (2000-03-01), None

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