Method for detecting mirror signal and the same circuit

Details Method for detecting mirror signal and the same circuit Method for detecting mirror signal and the same circuit

1997-11-21

1999-09-14

Tran, Thang V.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

059533056

ABSTRACT:
A mirror signal detecting method and apparatus which can detect a mirror signal accurately even though a disc has a defect area. A low pass filter filters a high frequency signal obtained from the disc having tracks arranged between each mirror region. The low pass filter removes a noise component caused by the defect area included in the high frequency signal. An intermediate voltage of the high frequency signal filtered by the low pass filter is detected and compared with the high frequency signal to detect a mirror signal.

REFERENCES:
patent: 5841751 (1998-11-01), Komazaki et al.
patent: 5854781 (1998-12-01), Kurihara

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