Pit pattern detecting apparatus and method

Details Pit pattern detecting apparatus and method Pit pattern detecting apparatus and method

1990-04-18

1992-08-04

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4426, 369 4428, 369 32, 369 4434, G11B 700

Patent

active

051365642

ABSTRACT:
A recording and/or reproducing apparatus includes a detection unit for detecting the presence of a tracking error detection pit pattern or a sector mark in a signal reproduced by an optical head frrom an optical record disk, on which tracking error detecting pits or sector mark detecting pits are recorded with a predetermined offset with respect to the center of the recording track. The detection unit is adapted for detecting the tracking error detecting pit pattern or the sector mark detecting pit pattern on the basis of a characteristic bit data pattern and a characteristic amplitude pattern in the signal reproduced from the record disk.

REFERENCES:
patent: 4068269 (1978-10-01), Commander et al.
patent: 4914645 (1990-04-01), Getrewer
patent: 4933922 (1990-06-01), Yokogawa
patent: 4937800 (1990-06-01), Oldham

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