| 摘要 |
A microphone is enclosed in a semi-sound insulated housing with a jingle bell type device that generates sound in response to a very slight movement and/or vibration of the housing and/or a structure to which the housing is attached. The sensor's sound insulated housing in cooperation with the microphone's adjustable sound sensitivity circuitry is designed for making the microphone responsive exclusively to the internally generated sound of a jingle bell sound generating type device in response to a movement/vibration of the sensor.
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