Disk evaluation device

Details Disk evaluation device Disk evaluation device

2006-07-11

2006-07-11

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Binary pulse train information signal

Including sampling or a/d converting

C369S059220, C369S053420

Reexamination Certificate

active

07075875

ABSTRACT:
The invention has an object to provide a disk evaluation apparatus capable of performing a highly reliable disk evaluation even on a recording disk on which information is recorded in high density. Amplitude-limited read sample value sequence are obtained by limiting read sample value sequence to a predetermined amplitude limit value, the read sample value sequence obtained by sampling a read signal read out from the recording disk as timed to a clock having the same frequency as that of a channel clock. Where a gap between a maximum sample value and a minimum sample value of the amplitude-limited read sample value sequence is equivalent to a predetermined distance of high-frequency wavelength, the maximum sample value and the minimum sample value are increased thereby to obtain high-frequency enhanced read sample value sequence enhanced at the high region thereof. The high-frequency enhanced read sample value sequence are converted to an analog high-frequency enhanced read signal as timed to the clock having the same frequency as that of the channel clock. Only components having frequencies equal to or smaller than a predetermined cutoff frequency are extracted from the high-frequency enhanced read signal so as to obtain an evaluation read signal. The evaluation read signal is binarized based on a predetermined threshold value to obtain a binary signal, which is outputted as a disk evaluation value.

REFERENCES:
patent: 5764611 (1998-06-01), Watanabe
patent: 10-282165 (1998-10-01), None
patent: 11-259985 (1999-09-01), None
patent: 2001-6181 (2001-01-01), None
patent: 2002-8324 (2002-01-01), None
Heitaro Nakajima et al., Zukai Compact Disk Dokuhon (revised 3rdedition), Ohmsha, Ltd., May 20, 1999, pp. 44, 54-57.
Edited by Torikeppusu Kikakubu, Torikeppusu Sosho (TR) 7, “Jisedai Hikari Disk Gijutsu”, Kabushiki Kaisha Torikeppusu, Feb. 1, 1997, pp. 83-84.

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