BCA evaluation device and method for rewritable DVDs with different threshold value pulse signals
US6882612B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Nov 13, 2001 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Nov 1, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2575
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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:IBMmax/IBSmin≦0.8IBRmax/IBS≦1.5
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.