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2. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   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 ...

3. 8 white noise machines for better sleep - AOL

   www.aol.com/news/8-white-noise-machines-better...

   Hatch Restore 2 $ at Amazon. Hatch Restore 2 $ at Target. Hatch Restore 2 $ at Hatch.co. The Hatch Restore 2 is a cross between a sunrise alarm clock and a sound machine that enables you to play ...

4. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   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 ...

5. Drown Out the Noise and Sleep Soundly With These Sound Machines

   www.aol.com/drown-noise-sleep-soundly-sound...

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6. Sound masking - Wikipedia

   en.wikipedia.org/wiki/Sound_masking

   As with any commercial-grade sound masking system, an in-plenum sound masking system requires proper layout design, commissioning, and verification of the performance. Disregarding the importance of any of these stages in implementation will result in a sound masking system that does not perform according to the specifications of an acoustician ...

7. These Sound Machines Help You Doze Off Fast and Sleep ... - AOL

   www.aol.com/lifestyle/sound-machines-help-doze...

   The best sound machines offer multiple noises, come with timers, and allow you to adjust the volume. Shop options from Hatch, Loftie, and Yogasleep now. These Sound Machines Help You Doze Off Fast ...

8. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Human activities might include voice, noise from amplified sound systems, or animal noise. Mechanical systems are elevator systems, boilers, refrigeration or air conditioning systems, generators and trash compactors. Aerodynamic sources include fans, pneumatics, and combustion. Noise control for aerodynamic sources include quiet air nozzles ...

9. Are sound machines actually good for sleep? - AOL

   www.aol.com/news/sound-machines-actually-good...

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