Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

2011-07-19

2011-07-19

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Signal processing by storage and subsequent retrieval

Reexamination Certificate

active

07983132

ABSTRACT:
An optical disk apparatus for enhancing time resolution of an RF sum signal. A reproduction sum signal (a signal A+a signal D) on the leading side and a reproduction sum signal (a signal B+a signal C) on the following side, which have been output from a four-quadrant photodetection section of an optical pickup, are supplied to first and second A/D converters. The first A/D converter samples a signal in accordance with a first clock signal CLK, and the second A/D converter samples a signal in accordance with a second clock signal CLK. The first and second clock signals CLK are out of phase with each other. By means of a phase difference between the clock signals, a phase difference between the leading-side reproduction signals and the following-side reproduction signals is compensated for. The phase difference between the first and second clock signals CLK is adjusted such that the quality of a reproduction signal, such as jitter, an error rate, or the like, is optimized.

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English Language Translation of Japanese Office Action relating to Japanese Patent Application No. 2006/237605, mailed May 11, 2010, 3 pages.
Japanese Office Action relating to Japanese Patent Application No. 2006/237605, mailed May 11, 2010, 2 pages.

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