Patent ID: 7756397
Filing Date: 2010-07-13
Classification: G11B,H04N

Abstract:
1. A video transmission system for transmitting a plurality of compressed video data compressed by different video compression systems and recorded on a recording medium, respectively, comprising: reproducing means for reproducing, from the recording medium, a data stream which includes mixed compressed video data so that the reproduced data stream mixedly includes (a) compressed video data compressed by a first video compression system and (b) compressed video data compressed by a second video compression system different from the first compression system, wherein the first and second video compression systems compress video data using different respective compression methods; synchronization information generation means for generating synchronization information of the data stream reproduced by said reproducing means so that the synchronization information includes synchronization information corresponding to the compressed video data compressed by the first video compression system and synchronization information corresponding to the compressed video data compressed by the second video compression system; transmission packet generation means for generating a transmission packet which includes a plurality of fields for storing the synchronization information generated by said synchronization information generation means, to transmit the data stream mixedly including the compressed video data compressed by the first video compression system and the compressed video data compressed by the second video compression system; transmission means for generating packet data so that divisional data divided from the data stream reproduced by said reproducing means is embedded in the transmission packet generated by said transmission packet generation means and the synchronization information generated by said synchronization information generation means is embedded dividedly in a different field in accordance with the first and second video compression systems, and transmitting the generated packet data; and recording control means for controlling recording operation of the data stream transmitted as the packet data by said transmission means, according to the synchronization information, wherein the transmission packet is a common isochronous packet, wherein the synchronization information corresponding to the compressed video data compressed by the first video compression system is stored in some but not all of the fields used to store the synchronization information corresponding to the compressed video data compressed by the second video compression system, wherein the synchronization information corresponding to the compressed video data compressed by the first video compression system comprises a 4 bit cycle count and a 12 bit cycle offset, both stored in a first field in a header of the common isochronous packet, and wherein the synchronization information corresponding to the compressed video data compressed by the second video compression system comprises a 13 bit cycle count and a 12 bit cycle offset, which are collectively stored in three fields in the header of the common isochronous packet, including the first field and two other fields.