SYNCHRONIZATION CIRCUIT FOR RECEIVING AND REGENERATING TIMING SIGNALS IN A SYNCHRONIZED DIGITAL TRANSMISSION SYSTEM

摘要

A control circuit couples the bit synchronization extraction circuit to the phase controlled oscillator of a synchronization circuit and transfers the synchronization component from the extraction circuit to the oscillator to control the phase of the oscillator when the signal-to-noise ratio of the synchronization component is at least at a predetermined level and prevents the transfer of the synchronization component to the oscillator to prevent phase control of the oscillator when the signal-to-noise ratio is below the predetermined level.