Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1997-10-10
2000-09-26
Chin, Stephen
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375364, 375340, 369 59, H04L 700
Patent
active
061251569
ABSTRACT:
A data sync signal detecting device with a simple configuration for detecting a sync signal having a few sync signal detection errors is disclosed. The detecting device is configured such that the output data of a most-likelihood decoder constituting a data discriminator is applied to a shift register bit cell and sequentially shifted and held in the bit cells of shift registers. The outputs of these bit cells are separated into an odd-numbered bit string and an even-numbered bit string and applied to first and second pattern matching circuits. The odd-numbered bit string is matched with "01001" as a predetermined sync signal pattern by a first pattern matching circuit which produces a first matching result. The even-numbered bit string is matched with "01011" as a predetermined sync signal pattern by a second pattern matching circuit which produces a second matching result. The first and second matching results are applied to a coincidence number adder/majority decision circuit. In the case of coincidence, the matching result is "1", and in the case of non-coincidence, the matching result is "0". The coincidence number adder/majority decision circuit has a threshold value of "1" and produces a sync signal detection output when the first or second matching result is "1".
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Chin Stephen
Hitachi , Ltd.
Liu Shuwang
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