Optical disc playback apparatus

Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting

Reexamination Certificate

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Details

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.

REFERENCES:
patent: 6385239 (2002-05-01), Okamoto et al.
patent: 6587410 (2003-07-01), Suzuki et al.
patent: 6724706 (2004-04-01), Nakajima et al.
patent: 6836511 (2004-12-01), Marukawa
patent: 5-120798 (1993-05-01), None
patent: 7-99426 (1995-04-01), None
patent: 09320198 (1997-12-01), None
patent: 10-64068 (1998-03-01), None
patent: 10290145 (1998-10-01), None
patent: 11-16279 (1999-01-01), None
patent: 11016279 (1999-01-01), None
patent: 2000-123487 (2000-04-01), None
patent: 2000123487 (2000-04-01), None
patent: 2000222824 (2000-08-01), None
patent: 2000311442 (2000-11-01), None
English translation of 10-064068(JP).
English translation of JP 5-120 798.
English translation of JP 7-099426.

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