As you all know, the normal noisethreshold for private housing is 55 decibels. At this site the levels have been recorded as high as 67 decibels.
众所周知,私人住宅的正常噪声阈值为55分贝。而此地的噪声已高达67分贝。
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Due to different wavelet threshold fit for different characteristic of signal, various wavelet de-noisethreshold was used to decline the harmonics of signal and the best threshold was chosen.
If the noise level is just below the threshold needed to flip the state of the system, even a tiny input voltage is enough to change the system's state.