|Disc-shaped recording medium, disc recording apparatus and disc reproducing apparatus
|Jan. 5, 1999/ Nov. 14, 1994
|Technique to be used when encoding MPEG video on Minidisc, placing I frames and B frames strategically with respect to linking sectors. Contains interesting drawing of pocket Minidisc video viewer ("MD Watchman"?).
|According to the present invention, when image data high-efficiency-coded based on the MPEG standard or the like is clustered at every sector of a predetermined number, a link sector is provided at a connected portion of each cluster and the image data is interleaved and recorded on a mini disc, the image data is recorded on each cluster at the unit of 1GOP. When the mini disc is a preformatted one and a P picture or B picture exists at the starting portion of the cluster, a picture which becomes a predictive standard is encoded as an I picture and recorded on the link sector of the immediately-preceding cluster independently of an original P picture. Upon decoding, when the I picture was not recorded on the link sector of the immediately-preceding cluster, the P picture or the B picture recorded at the starting portion of the cluster is inhibited from substantially being decoded. Thus, when the high-efficiency-coded image data is recorded on the disc-shaped recording medium, such as the mini disc or the like, an edit processing based on the unit of GOP becomes possible by a simple and rapid processing. Also, a special reproduction, such as a fast forward and a reverse reproduction based on the unit of GOP becomes possible by a simple and rapid processing.