British Telecommunications Corporation

British Telecommunications Public Limited Company

Martin Brown

Ian Herwono

Zhan Cui

Ben Azvine

Karl Smith

A multi-stage event detector for monitoring a system to detect the occurrence of multistage events in the monitored system, the multi-stage event detector includes: one or more event detecting detector units () for detecting observable events occurring on the monitored system; one or more parameter generating detector units () for generating parameter values which vary over time dependent on the behavior of the monitored system; a hidden state determiner () for determining a likely sequence of states of interest of the system based on the outputs of the one or more event detecting detector units; and a transition determiner () for determining a likely transition occurrence based on a comparison of a set of values of a parameter or set of parameters generated by one or more of the one or more parameter generating detector units with a plurality of pre-specified functions or sets of values of a corresponding parameter or set of parameters associated with different transition occurrences.

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London, United Kingdom

Martin Brown