Optical disc hidden data technique
US6717899B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2001 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Aug 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc having a plurality of user data written to the disc from a lead-in zone to a lead-out zone, the disc comprising a plurality of control display data composed of a plurality of subcode registers, each having a value, where the control display data are written to the disc interposed with the user data and written to the lead-out zone and hidden data encoded within one of the subcode registers in the lead-out zone. The p-bit register in the lead-out zone of the optical disc required to toggle at a rate of 2 Hz. In one second, the optical disc reader reads 75 p-bit registers, therefore a perfect 2 Hz toggling cannot be achieved. The location of a p-bit state composed of a fewer number of p-bit sector is used to represent a bit value of hidden data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.