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Amplitude modulation: Difference between revisions
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A characteristic of wind turbine noise that makes it more [[Annoyance|annoying]] than other noises at the same average [[Decibel|sound level]] is its pulsing or throbbing | A characteristic of wind turbine noise that makes it more [[Annoyance|annoying]] than other noises at the same average [[Decibel|sound level]] is its pulsing or throbbing “whoomph … whoomph”, which is called ''amplitude modulation'' (AM). | ||
Most existing noise regulations – when they exist at all – use long-term average measures of sound levels, and thus fail to take AM into account. (They usually also fail to consider [[infrasound and low-frequency noise]], another characteristic that makes wind turbine noise more intrusive. In addition, Australian acoustician Steven Cooper[https://www.wind-watch.org/documents/simplified-method-for-determination-of-amplitude-modulation-of-audible-and-inaudible-wind-turbine-noise/] notes that AM may be “felt” like intrusive infrasound as it modulates at infrasonic frequencies.) | Most existing noise regulations – when they exist at all – use long-term average measures of sound levels, and thus fail to take AM into account. (They usually also fail to consider [[infrasound and low-frequency noise]], another characteristic that makes wind turbine noise more intrusive. In addition, Australian acoustician Steven Cooper[https://www.wind-watch.org/documents/simplified-method-for-determination-of-amplitude-modulation-of-audible-and-inaudible-wind-turbine-noise/] notes that AM may be “felt” like intrusive infrasound as it modulates at infrasonic frequencies.) | ||