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2. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   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 ...

3. Sound recording and reproduction - Wikipedia

   en.wikipedia.org/wiki/Sound_recording_and...

   Sound recording and reproduction is the electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording. Acoustic analog recording is achieved by a ...

4. Electromagnetically induced acoustic noise - Wikipedia

   en.wikipedia.org/wiki/Electromagnetically...

   Electromagnetically induced acoustic noise (and vibration), electromagnetically excited acoustic noise, or more commonly known as coil whine, is audible sound directly produced by materials vibrating under the excitation of electromagnetic forces. Some examples of this noise include the mains hum, hum of transformers, the whine of some rotating ...

5. 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).

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

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

   Tisch recommends this white noise machine, which features 14 different sound options to lull you to sleep. "White noise, calming ocean waves, the soothing fall of rain, and more," she notes of ...

7. 8 white noise machines for better sleep - AOL

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

   This simple white noise machine offers ten fan sounds and ten ambient noise variations (including white, pink and brown noise). It is powered by either AC or USB and you can adjust the volume with ...