Dynamic information storage or retrieval – Binary pulse train information signal – Format arrangement processing for auxiliary information
Reexamination Certificate
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).
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Saiki Eiichi
Yamanoi Koyu
Chu Kim-Kwok
Korzuch William
Moore J. Dennis
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