Low-frequency noise problems for the elderly massa

4 years, every night,

Six or seven points every night, the noise will be on time, from the uninterrupted; It is curious that this less than @ wearing Beckham tried various ways to find a sound source, but has no results. Yesterday, the answer finally revealed the culprit turned out to be low-frequency noise, a massage!
low frequency disturbance

noise entangled her house 4 years

last December, The Micro Beckham @ Dai Bo for help, from where, so far unknown. crazy ~ 1 floor tenants,mbt shoes sale, occasionally can be heard but not loud.
What is a low-frequency noise? Simply is the frequency below 500 Hz sound,louis vuitton belts, sound small, but strong penetrating power, low frequency noise on the human body is a chronic injury, it could upset, irritability, and even irrational, if long-term by the harassment, but also may cause neurasthenia, insomnia, neurosis, pregnant women, the elderly, patients with cardiovascular disease, especially big impact.
@ David Beckham wearing a noise is heard in the first 4 years ago, distress. Beginning in 2009, she has been looking for this
mystery heavy

noise exactly where it comes from

@ static wear Beckham was first to find the source of noise control in Hangzhou Co., Ltd. for The answer, the person said that the culprits are hard to find low-frequency noise. wall reflection to residents of the home. asked, but the other said that set-top box will not send low-frequency noise.
set-top box is not the issue in order to figure out the culprit low-frequency noise, @ wearing Beckham invited three teachers, eliminating Zhejiang University, Zhejiang University, one of them is the Bai-Sheng Wang, deputy director of Civil Engineering and Test Center. After three teacher professional view, ruled out this possibility, because the noise source is a shock, but the set-top boxes do not. Also,coach outlet store, according to view, they feel should be a noise source F households with a freezer. If so, as long as the freezer closed, the noise can be eliminated.
However, six or seven points that night,
the answer is revealed

noise source is actually a massage

week ago, wearing a Beckham @ help to the Times, Times contacted Zhejiang Central ASTRI noise experts to help. Noise expert explained: tracks the sound to find the source, but each time the noise lasts only half an hour, did not find the answer two days, until the third day, the mystery was revealed.
yesterday morning, wearing a David Beckham to live in the upstairs @ Xu uncle (a pseudonym), a sudden knock on the door of her house. Xu uncle said: Beckham tested @ Dai,louis vuittion bags, Xu uncle's massage was opened,
Precisely, the time also on the!
the massage looks a bit like vacuum cleaners, heavy, on top of the thread surface. Massage, Xu uncle sitting, or resting on top of legs, the machine vibration massage.
layer of a floor

massage vibration sound is magnified

why a little massage, but it will produce low frequency noise? In this regard, the noise expert said: Grandpa downstairs in Xu, massage the sound is amplified so.
layer above the house is built with reinforced concrete are. (Editor: SN005)