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  2. 5 Great Sound Machines That Will Transform Your Sleep - AOL

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

    There's no quirky nature sound library here, just 22 total fan and white noises (10 fan sounds, 10 white, pink, and brown noises, and two ocean noises)—all non-looping, so there’s no jarring ...

  3. 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 ...

  4. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

  5. Electronic voice phenomenon - Wikipedia

    en.wikipedia.org/wiki/Electronic_voice_phenomenon

    v. t. e. Within ghost hunting and parapsychology, electronic voice phenomena (EVP) are sounds found on electronic recordings that are interpreted as spirit voices. Parapsychologist Konstantīns Raudive, who popularized the idea in the 1970s, described EVP as typically brief, usually the length of a word or short phrase.

  6. History of sound recording - Wikipedia

    en.wikipedia.org/wiki/History_of_sound_recording

    Ring-and-spring microphones, such as this Western Electric microphone, were common during the electrical age of sound recording c. 1925–45.. The second wave of sound recording history was ushered in by the introduction of Western Electric's integrated system of electrical microphones, electronic signal amplifiers and electromechanical recorders, which was adopted by major US record labels in ...

  7. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...

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