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2. 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 ...

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. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   A LectroFan white noise machine A clock radio that includes a 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.

5. 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 .

6. White, brown and pink noise machines are going viral for ...

   www.aol.com/news/white-brown-pink-noise-machines...

   What is the difference between white noise, brown noise and pink noise and do they actually work to improve sleep or relaxation? Experts explain. White, brown and pink noise machines are going ...

7. The Mosquito - Wikipedia

   en.wikipedia.org/wiki/The_Mosquito

   The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...