Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1993-11-18
1995-08-22
Coles, Sr., Edward L.
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375354, 3701001, H04L 700
Patent
active
054447437
ABSTRACT:
A synchronous pulse generator (100) for producing synchronization pulses that are synchronized with a preamble pattern contained in an input digital data signal. The generator contains a correlator circuit (102), a pulse generator circuit (106) and a flywheel circuit (104). The correlator circuit is an M-bit out of N-bit preamble correlator which periodically generates timing pulses whenever M-bits in a received preamble match M-bits in an N-bit preamble pattern. The pulse generator circuit periodically generates a synchronization pulse at a rate equivalent to an expected rate of occurrence of the preambles. The flywheel circuit monitors the occurrence of the timing pulses from the correlator circuit relative to the synchronization pulse occurrences from the pulse generator circuit. Furthermore, the flywheel circuit resets the pulse generator circuit when the timing pulses are not synchronized with the synchronization pulses for a pre-defined period of time. As such, when necessary, the flywheel circuit facilitates re-synchronization of the synchronization pulses to the timing pulses. Additionally, during transient losses of timing pulses, the flywheel circuit facilitates production of a continuous stream of synchronization pulses. The flywheel circuit and correlator circuit are programmable such that their operational parameters can be set and then dynamically altered during operation of the synchronous pulse generator.
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Coles Sr. Edward L.
Hitachi America Ltd.
Michaelson Peter L.
Nguyen Madeleine
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