BCA evaluation device and method for rewritable DVDs with...

Details BCA evaluation device and method for rewritable DVDs with... BCA evaluation device and method for rewritable DVDs with...

2005-04-19

2005-04-19

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S059180

Reexamination Certificate

active

06882612

ABSTRACT:
An RF signal is read from a rewritable DVD while rotating the rewritable DVD. The read RF signal is converted to pulse signals according to different threshold values, and the number of pulses of each pulse signal is counted. Indexes IBSmin, IBMmax, IBS, and IBRmax are determined from the relationship between the counted numbers and the threshold values, and the recording quality of the BCA on the rewritable DVD is evaluated by judging whether these indexes satisfy the following inequalities:in-line-formulae description="In-line Formulae" end="lead"?IBMmax/IBSmin≦0.8in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?IBRmax/IBS≦1.5in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6034934 (2000-03-01), Miyake et al.
patent: 6034937 (2000-03-01), Kumagai
patent: 6519213 (2003-02-01), Song et al.
patent: 6574422 (2003-06-01), Kikuchi et al.
patent: 6661768 (2003-12-01), Yumiba et al.

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