Importance

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Abstract

An improved synchronization method and apparatus is disclosed which derives a common reference signal from a pilot frequency which is embedded among other signal information and which may be preselected from among a group of possible pilot frequencies utilized in multiplexing and demultiplexing groups of information signals on a RF communication system. One such arrangement as disclosed provides for rapid phase-lock acquisition with very few functional blocks by utilizing a linear multiplier as a phase detector at the generally higher pilot frequency rather than the much lower reference frequency. Another embodiment discloses a method and arrangement for providing automatic leveling of the pilot frequency input signal using a second linear multiplier as an amplitude detector. By definition, the first linear multiplier requires the injection signal to be in phase-quadrature with the inputted pilot frequency, while the second linear multiplier requires its injection signal to be in phae with the pilot frequency input signal in order to develop a signal output proportional to the signal level of the pilot frequency input signal. These arrangements are able to provide rapid locking capability without tedious hardware changes being made to the synchronization stages.

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First Claim