“The description of wind turbine noise needs a terminological shift. The language should be pulsations at an infrasound rate with modulation of the entire signal at an infrasound rate (as in sensation detected by the ear).” [Cooper, below]

Q:  You referred earlier [yesterday] to your second paper at the ICA  that is linked to the synthesis paper. Maybe my question on ILFN ties in with the paper on Amplitude Modulation that raises questions as to terminology?

Cooper: Yes. The second paper on amplitude modulation is very important. Because what people are calling AM (by reference to the dBA signal) is incorrect. An electrical engineer will tell you that AM is the modulation (variation in the amplitude) of a carrier frequency (being a high frequency) that is modulated at a lower rate.…

“But wind turbine noise issues are not just an acoustic issue. I have been trying to solve the acoustic problem to allow the medical side to then undertake the required research.” (Cooper, below)

Last year, I interviewed acoustician Steven Cooper, AU on wind turbine health issues related to pulsation and low-frequency noise. “In general, wind farm applications claim that turbines do not generate any low-frequency, tonal, or impulsive characteristics,” he noted, “which is a matter disputed by residential receivers.”

What has developed in the last 20 months? In this two-part series (today and tomorrow), Mr. Cooper shares his most recent research and findings, which complement our current knowledge regarding the nature of “noise” impacts to real-time victims of wind power.

Mr. Cooper recently presented his new findings in Germany at the International Congress on Acoustics Conference.…