474
edits
No edit summary |
mNo edit summary |
||
Line 7: | Line 7: | ||
ILFN travels much farther with less dissipation than higher-frequency sound. It can go around barriers and penetrate – even resonate with – walls. | ILFN travels much farther with less dissipation than higher-frequency sound. It can go around barriers and penetrate – even resonate with – walls. | ||
Most existing noise regulations use [[Decibel|A-weighted noise measurement]], which emphasizes the range of human conscious hearing. Thus they fail to take ILFN into account. (They usually also fail to consider [[amplitude modulation] | Most existing noise regulations use [[Decibel|A-weighted noise measurement]], which emphasizes the range of human conscious hearing. Thus they fail to take ILFN into account. (They usually also fail to consider [[amplitude modulation]], another characteristic that makes wind turbine noise more [[Annoyance|annoying]] and which itself, according to Australian acoustician Steven Cooper[https://www.wind-watch.org/documents/simplified-method-for-determination-of-amplitude-modulation-of-audible-and-inaudible-wind-turbine-noise/], may be “felt” like infrasound as it modulates at infrasonic frequencies.) | ||
In 2011, Denmark imposed a 20 dBA limit for low-frequency (10–160 Hz) noise inside homes.[http://docs.wind-watch.org/DK-statute-wind-turbine-noise.pdf] A few localities have imposed limits defined by C-weighted measurements in addition to A-weighted, e.g., 50 dBC at the property line.[http://wndfo.net/ords] | In 2011, Denmark imposed a 20 dBA limit for low-frequency (10–160 Hz) noise inside homes.[http://docs.wind-watch.org/DK-statute-wind-turbine-noise.pdf] A few localities have imposed limits defined by C-weighted measurements in addition to A-weighted, e.g., 50 dBC at the property line.[http://wndfo.net/ords] | ||
'''''See also:''''' [[Health Effects of Noise from Large Wind Turbines]]. | '''''See also:''''' [[Health Effects of Noise from Large Wind Turbines]]. |