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SoundSleep White Noise Sound Machine. Homedics has long been a favorite brand of ours for its affordable, ... 10 white, pink, and brown noises, and two ocean noises)—all non-looping, so there ...
Small and easily portable, this sound machine includes three sound options so you can find the right fit for you: bright white noise, deep white noise, and gentle surf. $19.99 at Amazon Restore 2 ...
A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds. Often such devices do not produce actual white noise, which has a harsh sound, but pink noise, whose power rolls off at ...
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A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .
A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...
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