Abstract: A transportable security surveillance system for rapid installation in the office of an employee who may face a potentially violent situation. An Ethernet LAN connects a central security computer in a central security station to an audio-video compressor (AVC) in the employee's office. A covert video camera and a microphone in the employee's office provide video and audio data to the AVC. The employee is provided with a triggering device that triggers the AVC to begin streaming real-time audio and video data over the LAN to the central security computer when a situation arises that requires real-time surveillance of the employee's office. Before the trigger, no data is transmitted over the LAN. Pre-trigger data may be stored in an AVC memory, and may be retrieved for later analysis following a triggering event.

Abstract: An engine service monitoring system and method for an engine having a spark plug, an ignition circuit with a transformer and a spark plug wire disposed between the spark plug and a coil of the transformer. A counting circuit for counting the ignition or spark pulses is inductively coupled to the spark plug wire such that for every spark pulse generated, a DC pulse is provided by a rectifier of the counting circuit. The DC pulses are provided to a computing element which computes the total number of the pulses, selectively adjusts the count on the basis of a low-oil pressure condition, an out-of-range temperature condition or other suitable operator-defined condition. The computing element also compares the adjusted count with one or more service change interval threshold values to provide an alarm to indicate that a service change is needed. The threshold values are either factory-set or field-adjustable.