| 摘要 |
A frame number detector for detecting frame number receives input signals consisting of a plurality of sectors. A sector consists of a plurality of frames, a frame including synchronizing signals and data, the synchronizing signals having a pattern used to identify a frame number in a sector, the pattern being defined to identify a frame number from a pattern of the synchronizing signals in a frame or from patterns of the synchronizing signals in consecutive frames. A pattern of synchronizing signals is extracted for consecutive frames from input signals, and the extracted pattern is compared with a predetermined pattern to determine with majority principle whether the extracted pattern agrees with the predetermined pattern. Then, a frame number is determined based on an output signal of the comparison. In an example, a block consists of for example two frames of the extracted pattern of synchronizing signals, and the comparison is performed in the unit of block. Thus, the frame number is detected correctly even when synchronization patterns of data comprises synchronization patterns having short distances between codes.
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