Detector for detecting sync bits in a stream of data bits

Details Detector for detecting sync bits in a stream of data bits Detector for detecting sync bits in a stream of data bits

1984-10-22

1986-08-19

Bookbinder, Marc E.

Pulse or digital communications

Spread spectrum

Direct sequence

H04L 700

Patent

active

046073787

ABSTRACT:
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.

REFERENCES:
patent: 3586776 (1971-06-01), Salava
patent: 3766316 (1973-10-01), Hoffman et al.
patent: 4404675 (1983-09-01), Karchevski
patent: 4450558 (1984-05-01), Hampton et al.

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