| 摘要 |
An event detection system with centralized signal processing and dynamically adjustable detection threshold includes a number of remotely located event detection units coupled to a single centralized signal processing unit. Each event detection unit provides an event detection signal to the centralized signal processing unit. At least one signal processor in the centralized signal processing unit compares the value of the event detection signal with a dynamically adjustable threshold value, and provides a first detection signal when the event detection signal exceeds the value of the dynamically adjustable threshold. A threshold generator compares the event detection signal and a predetermined offset value, and adjusts the value of the dynamically adjustable threshold as the event detection signal exceeds the offset value. The signal processor then provides a second event detection signal when the event detection signal exceeds the adjusted threshold value. The invention further includes a mutual event verifier located in the centralized signal processing unit, for establishing at least one of the event detection units as a mutual verification event detection unit, and for activating an alarm only upon the concurrence of a detection signal from the designated mutual verification event detection unit, and a second confirming detection signal from any other event detection unit coupled to the system.
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