International Standard Electric Corporation

Colin Jeffrey

Ian A Vance

Brian A Bidwell

Michael John Woodley

David F Leevers

A method of synchronizing a digital radio pager receiver with incoming digital data signals. At switch-on the receiver first attains a 'course' bit synch during the first quarter-word period and then a 'fine' bit synch during the next half-word period. The receiver then examines incoming data bits to determine simultaneously (a) whether valid data is being received and (b) whether the incoming data contains a preamble sequence. If either determination is successful the incoming data is then examined to determine whether it contains a synchronizing word or an address word. The synchronization and address word determination is also carried out while bit synch is obtained and the valid data/preamble determination is effected.

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Stansted Mountfitchet, United Kingdom

Colin Jeffrey