Patent ID: 8096167
Filing Date: 2012-01-17
Classification: F17D,G01M

Abstract:
1. A leakage detector comprising: a vibration detector having a pickup incorporating a piezoelectric element; a main body of the leakage detector incorporating a voltage amplifier for voltage-amplifying an output signal and a plurality of types of noise removing units each for removing noises from the output signal; and a headphone, wherein the plurality of types of noise removing units include a delayed noise removing unit and at least one type of noise removing unit from among a band pass filter and a comb filter, and wherein said delayed noise removing unit converts the output signal including leaking sounds and external noises mixed therein into a converted signal consisting of specific frequency components, compares powers of the frequency components included in the converted signal sampled at different time points respectively, selects a frequency component, from among the frequency components, having a smaller power throughout a bandwidth, and generates a signal from which noises have been removed based on the frequency components that are not selected.