Frame synchronizer

Details Frame synchronizer Frame synchronizer

1975-03-26

1977-01-11

Robinson, Thomas A.

Telegraphy

Systems

Printing

178 691, H04J 306, H04L 708

Patent

active

040028453

ABSTRACT:
A frame synchronizer is disclosed for searching for the framing bits of an N bit frame in a stream of binary signals. Means are provided to compare, bit by bit, the signals in different bit positions of two adjacent frames. When only a single bit position indicates an alternating pattern of binary signals, it is considered the framing bit and a framing pulse is provided in that bit position. Apparatus is also provided to detect loss of synchronization including a pair of counters, one counting framing pulses and the other counting alternating signals in that bit position. To reduce the likelihood of false out-of-synchronization signals, the second of these counters can be pre-set. Only when the count of the first counter exceeds the number of signals counted by the second counter by this pre-set quantity will out-of-synchronization be declared.

REFERENCES:
patent: 3539997 (1970-11-01), Mahony
patent: 3576947 (1971-05-01), Kruger
patent: 3597539 (1971-08-01), Clark
patent: 3621140 (1971-11-01), Griffiths
patent: 3842399 (1974-10-01), Kneuer et al.
patent: 3854011 (1974-12-01), Mallory et al.
patent: 3883729 (1975-05-01), DE Cremiers

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