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Abstract

An environmental abnormality detection apparatus includes a detector for detecting environmental changes by monitoring physical changes in the environment and generating an output signal upon the detection of such an abnormality, a signal processor which generates an environmental abnormality signal based on the output of the detector, and a switching circuit connected between a pair of power source/signal lines. The apparatus further includes an oscillator and a control circuit which generates a signal for controlling the switching circuit obtained by the product of an output from the oscillator and the output of the signal processor. A power source is charged from the power source/signal lines, and supplies power to the detector, the signal processor and the oscillator.

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First Claim