| 摘要 |
An impact sensing system senses an impact or acceleration applied and provides an external alarm indicative of the impact or acceleration applied. An envelope detector detects an envelope of an output signal of said sensor unit. An amplifier amplifies the output signal of said envelope detector, a direct current component being eliminated therefrom. A first low pass filter filters a first level signal from the output signal of said amplifier, the first level signal being indicative of a first level of impact or acceleration. A second low pass filter filters a second level signal from the output signal of said amplifier, the second level signal being indicative of a second level of impact or acceleration. A first timing pulse generator generates a first timing pulse with a first time duration in response to the output signal of said first low pass filter, the first time duration being indicative of said first level signal. A second timing pulse generator generates a second timing pulse with a second time duration in response to the output of said second low pass filter, the second time duration being indicative of said second level signal. An alarm drive circuit drives an external alarm in response to the first timing pulse and the second timing pulse. A power supply is coupled to said envelope detector, said amplifier, said first timing pulse generator, said second timing pulse generator and said alarm drive circuit for supplying a stable electric power source.
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