Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting
Reexamination Certificate
2006-02-14
2006-02-14
Young, W. R. (Department: 2655)
Dynamic information storage or retrieval
Binary pulse train information signal
Including sampling or a/d converting
C360S059000, C360S059000, C360S065000, C360S047000
Reexamination Certificate
active
06999394
ABSTRACT:
An optical disc playback apparatus that performs appropriate waveform equalization according to a difference in characteristics of reproduced signals between land parts and groove parts in an optical disc to which high-density recording is performed using a land/groove recording method. The optical disc playback apparatus includes a reproduction device, an A/D conversion circuit for sampling a reproduced signal to be converted into a multi-bit digital signal, a filter for subjecting the multi-bit digital signal to digital equalization, a filter coefficient learning device for adaptively controlling filter coefficients for the filter corresponding to the land part and the groove part to minimize an equalization error, and a switch signal generation device for generating a signal for switching between land and groove, thereby changing the filter coefficient adaptively to the land or the groove.
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English translation of 10-064068(JP).
English translation of JP 5-120 798.
English translation of JP 7-099426.
Ogura Youichi
Sato Shinichiro
Urita Kouichi
Matsushita Electric - Industrial Co., Ltd.
Ortiz-Criado Jorge L.
Wenderoth , Lind & Ponack, L.L.P.
Young W. R.
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