Optical disc, and recording apparatus, recording method, and reproducing apparatus for the same
A playback device, optical disc technology, applied in the direction of optical recording/reproducing/erasing method, recording/reproducing with optical method, optical recording system, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
no. 1 example
[0068] A first embodiment of the present invention is described below with reference to the accompanying drawings.
[0069] (disc recording device)
[0070] FIG. 2 is a sub-block diagram showing the structure of the characteristic part of the optical disc recording apparatus 100 of the first embodiment. Note in this figure that the waveforms of the main signals B, D, E, and F are at image 3 Shown in a time diagram. Moreover, a block enclosed by a double-lined rectangle in FIG. 2 means that the structural elements of the block are installed securely to prevent disassembly of its internal structure. For example, the structural elements are realized by circuits defined within one LSI.
[0071] The optical disc recording device 100 is a DVD-ROM recording device and has a unique function, that is, the optical disc recording device 100 not only records main digital information by forming recording marks at discrete reference positions on the track of the optical disc but also re...
no. 2 example
[0139] A second embodiment of the present invention is described below with reference to the drawings.
[0140]
[0141] Figure 18 It is a block diagram showing the characteristic parts of the optical disc recording apparatus 200 of the second embodiment. Note that in this figure the waveforms of the main signals B, D and E are at Figure 19 Shown in a time diagram. and, Figure 18 A block surrounded by a double-lined rectangle in means that the structural elements of the block are installed securely.
[0142] The optical disc recording device 200 is a DVD-ROM recording device having a unique function. That is, the optical disk recording apparatus 200 records main digital information not only by forming recording marks at discrete reference positions on the track of the optical disk but also by forming A mark is recorded to embed hidden information such as a watermark (56-bit secret key in this embodiment) into primary digital information as secondary digital informati...
no. 3 example
[0189] A third embodiment of the present invention is described below with reference to the drawings.
[0190] Figure 25 is the structure of data recorded on the optical disc 311 of this embodiment. As shown in the figure, anti-duplication information 312 is recorded on an optical disc 311 . This information 312 is recorded by locally performing phase modulation on a reference clock and forming pits and lands with reference to the phase-modulated clock. That is, some data strings recorded onto the optical disc 311 are moderately out of synchronization with the reference channel clock. Therefore, the phases of these data strings deviate from the reference clock and a large amount of jitter is detected during playback for these data strings.
[0191] This embodiment is similar to the first embodiment in that secondary digital information (copy-protected information 312) is embedded by locally shifting the phase of the reference clock by a shift amount not greater than the am...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More