Communication system with external reference signal processing c

Details Communication system with external reference signal processing c Communication system with external reference signal processing c

1989-06-29

1992-01-14

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

455103, 455260, 331 18, 331DIG2, H04B 138

Patent

active

050817051

ABSTRACT:
The present invention comprises a communication system including a number of independently operating equipment modules in which the operations of these modules are referenced to a common external signal and thereby phase synchronized in order to reduce intra-system interference. The system includes a number of phase lock loop type processing circuits one of which is associated with each equipment module for tracking the external reference signal and generating a base reference for use by module with which each processing circuit is associated. The system takes advantage of the inherent capabilities of phase lock loop circuits to provide a base reference for each equipment module which is characterized by a frequency spectrum having a reduced level of spurious signals and noise. The preferred embodiment includes components for automatically switching between internally and externally generated reference signals and for automatically converting an external reference signal to a standard frequency.

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patent: 4745371 (1988-05-01), Haine
patent: 4817199 (1989-03-01), Wallraff

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