Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-08-01
2000-12-26
Edun, Muhammad
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 59, 369 54, G11B 700
Patent
active
061670081
ABSTRACT:
A skew detecting method for easily performing a detection of a tangential skew occurring between a recording surface of an optical disc and a pickup with a high reliability. A reflection light when a reading beam is irradiated to the recording surface of the optical disc is received and converted into an electric signal. The electric signal is used as a read signal. An error value between each read sampling value in a read sample sequence obtained by sampling the read signal and a prediction value is obtained. The tangential skew is detected based on the error value when a polarity of the read sampling value obtained at a time point that is preceding to a time point when the error value is derived by a predetermined time and a polarity of the read sampling value obtained at a time point that is subsequent to the time point when the error value is derived by the predetermined time are different.
REFERENCES:
patent: 5442615 (1995-08-01), Ohsato et al.
patent: 5483512 (1996-01-01), Yanagawa
patent: 5546367 (1996-08-01), Yoshimura et al.
patent: 5703855 (1997-12-01), Kirino et al.
patent: 5719847 (1998-02-01), Tateishi et al.
Edun Muhammad
Pioneer Electronic Corporation
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