| 摘要 |
PROBLEM TO BE SOLVED: To automatically detect respective data blocks of different length intermingled in a data stream. SOLUTION: Input data are fed to shift registers 10, 11 respectively corresponding to data lengths L, K where L>K and 2K>L hold. Based on a synchronization pattern in input data detected by a circuit 14, the synchronization pattern is detected in inputs and outputs of the shift registers 10, 11. A data length of signals from the circuits 10, 11 from which the synchronization pattern is detected is used for a SYNC block length. The detected SYNC information is stored in a RAM 17 from the head of the information when the length of the information is K and stored in the RAM 17 from a bit of the information by (L-K) bits from the least significant bit when the length is L. The information is fed to an inertia circuit 18 from the (2L-K)th bit from the head of the information stored in the RAM 17. When the length is K, the circuit 18 delays the information by (L-K) and outputs a resulting synchronization pulse. A delay line 19 outputs a SYNC block synchronously with the synchronization pulse.
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