| 摘要 |
According to the invention sub-picture data are organized in sub-picture units (SPU), the sub-picture units comprising pixel data in a pixel data area (PXD) as well as display control data (SP13 DCSQT) and/or address information data (SPUH), wherein a sub-picture unit (SPUH1, PXD1, SP_DCSQT1) of a second sub-picture stream is inserted into the pixel data area (PXD) of a sub-picture unit (SPU) of a first sub-picture stream. This permits several sub-picture streams for systems, which are defined to allow only a single sub-picture stream. Especially for DVD-VR conflicts with the already existing DVD-VR specification are avoided. Therefore, enhanced DVD-VR devices using the invention are able to record and playback additional sub-picture streams and conventional DVD-VR devices are able to record and playback the same signal without any compatibility problems, although restricted to only a single sub-picture stream.
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