| 摘要 |
A detector for detecting a valid synchronizing pattern in a data frame in which a synchronizing bit pattern is multiplexed including a first register to receive the data and the synchronization bits, a pattern detector connected to the first register for detecting the synchronizing bit pattern in the first register, a second register, a source of clock pulses coupled to both said first and second registers, the elements of the second register being set to a first binary state and a density detector coupled to the second register. The clock source changes the states of successive elements of the second register from the first binary state to a second binary state as the data and synchronization bits are moved through the first register, the second register having inserted therein a signal of the first binary state upon the simultaneous detection of the synchronizing bit pattern and the conversion of a last element of said second register from a second binary state to a first binary state, and means responsive to the density detector detecting a predetermined number of elements of said second register in said first binary state to establish synchronization.
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