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References in periodicals archive ?
A low-frequency sound that humans can not hear is an infrasound.
Infrasound would help widely separated members of the group stay in contact.
perception of infrasound, low frequency noise and vibration by man and animals;
TABLE 1 Sound Frequency Spectrum Frequency (Hz) 0 10 20 100-250 20,000 Infrasound Infrasound Low frequency Non-low Ultrasound (with body sound frequency audible resonance) sound Range of infrasound Range of human hearing Inaudible Note.
Infrasound emission from wind turbines, Journal of Low Frequency Noise, Vibration and Active Control 24(3): 145-155.
Wind generator infrasound is an emerging health concern not yet regulated by the state, according to officials.
Frequencies below the audible range are called infrasound.
To compound this view, also on the BWEA website, Dr Leventhall wrote: "I can state quite categorically that there is no significant infrasound from current designs of wind turbines.
Acoustical weapons, which have not yet been perfected, would employ inaudible infrasound to resonate in body cavities and cause disorientation, nausea, vomiting, and bowel spasms.
These frequencies are from previous physiological surveys already established and move especially on the field of infrasound and then in audible range of frequencies around 300 and 2000Hz.
In addition, the organization is building 60 infrasound stations that detect minute changes in atmospheric pressure caused by a nuclear test.
Seismic sensors record shockwaves in the ground caused by underground nuclear explosions while hydroacoustic and infrasound stations monitor the oceans and atmosphere respectively.