Data-update apparatus, reproduction apparatus, data-addition apparatus, data-detection apparatus and data-removal apparatus
US6696989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2002 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Sep 11, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/10601
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention relates to an apparatus and method for embedding data in a signal or for updating data that has been embedded. The object of the invention is to provide a data-update apparatus that together with greatly reducing the amount of operation required for adding, detecting and removing data (electronic watermark) in a plurality of signals, makes it rigid copyright protection possible. In order to accomplish this objective, the present invention provides a data-update apparatus comprising: a channel-selection means that selects and outputs part of the channels of the input signal; a detection means that detects the electronic watermark that is embedded in the signal of the channel selected by the channel-selection means; a judgment means, to which the data detected by the detection means is input, and that determines whether or not to update the electronic watermark; an update-signal-generation means, to which an update instruction is input from the judgment means and to which the signal of the channel selected by the channel-selection means is input, and that outputs an update signal for updating the detected data; and a channel-selection-addition means that selects part o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.