Sync detection circuit and method using variable reference for c

Details Sync detection circuit and method using variable reference for c Sync detection circuit and method using variable reference for c

1997-04-23

1998-08-25

Chin, Stephen

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

375365, H04L 700

Patent

active

057990506

ABSTRACT:
In a sync detector, a baseband signal is segmented into a plurality of successive bit sequences so that the bits of each sequence are shifted by one bit position with respect to the bits of adjacent sequences. On a bit-by-bit basis, mismatches are detected between each input bit sequence and a predetermined bit sequence and the detected mismatches are counted to produce a mismatch count. A first comparison is made between the mismatch count and a reference value to determine that a sync code is detected if the mismatch count is equal to or smaller than the reference value, and a further comparison is made between successively produced mismatch counts to determine that a sync code is detected when the later of the successively produced mismatch counts is equal to or smaller than the earlier one. The first comparison is repeated when the later mismatch equals zero.

REFERENCES:
patent: 3525813 (1970-08-01), Taylor et al.
patent: 4554540 (1985-11-01), Mori et al.

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