Mark detecting circuit for an optical disk

Details Mark detecting circuit for an optical disk Mark detecting circuit for an optical disk

2006-02-28

2006-02-28

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Binary pulse train information signal

Format arrangement processing for auxiliary information

C369S053290, C369S053340, C369S053220, C369S044290, C369S044350

Reexamination Certificate

active

07006423

ABSTRACT:
A mark detecting circuit that stably and reliably detects the marks for address information from an optical disk having tracks formed in a spiral shape and having waviness with a fixed period. In the land pre-pit signal extracting portion12, by means of first bottom envelope circuit32with a high tracking speed, first bottom envelope signal Sbtm1that represents at high sensitivity the bottom envelope of push-pull signal (SA+SB)−(SC+SD) is generated; and, by means of second bottom envelope circuit34with a low tracking speed, second bottom envelope signal Sbtm2that represents at low sensitivity the bottom envelope waveform of push-pull signal (SA+SB)−(SC+SD) is generated. Then, with the signal, obtained by level shift treatment of said second bottom envelope signal Sbtm2using offset circuit36, used as threshold signal Sref, first bottom envelope signal Sbtm1is converted to a binary form. And land pre-pit signal SLPPis extracted from push-pull signal (SA+SB)−(SC+SD).

REFERENCES:
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patent: 6396778 (2002-05-01), Takemura et al.
patent: 6526006 (2003-02-01), Yoshimi et al.

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