Walls have ears

A sound and vibration detection system developed by Geoquip and Domain Dynamics, it is claimed, is able to tell whether an intruder is climbing a fence with or without the help of a ladder.

PSICON (perimeter security and intrusion classification system) which is currently being used in 250 `zones’ around the world, uses TESPAR – a recognition tool developed by Domain Dynamics – to analyse sound data.

Each protected zone contains a number of hidden sensors which detect noise or vibration signals. These signals are then coded by TESPAR, which focuses on specific elements within the signal patterns, like zero crossings, peaks and troughs within the signal and the intervals of time between them. The resulting data is ideal for correlation comparisons where the TESPAR data is compared with stored examples of known intrusions.