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2. The 6 Best Sound Machines for a Restful Night's Sleep - AOL

   www.aol.com/6-best-sound-machines-restful...

   In addition to an adjustable strap, this sound machine from the experts at Yogasleep contains 20 noise options, and a sleep timer for either a 45-, 90 minute, or eight-hour snooze.

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. 5 Great Sound Machines That Will Transform Your Sleep - AOL

   www.aol.com/5-great-sound-machines-sleeping...

   In fact, this sound machine offers only the essentials, including a volume knob, a timer, and just six built-in sounds (White Noise, Thunder, Ocean, Rain, Summer Night, and Brook).

5. 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 ...

6. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   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 .

7. Sound masking - Wikipedia

   en.wikipedia.org/wiki/Sound_masking

   Sound masking is the inclusion of generated sound (commonly, though inaccurately, referred to as "white noise" or "pink noise") into an environment to mask unwanted sound. It relies on auditory masking. Sound masking is not a form of active noise control (noise cancellation technique); however, it can reduce or eliminate the perception of sound ...