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  2. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control or ANC.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.

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  4. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear; [1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise ...

  5. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    A pair of supra-aural (on-ear) headphones. Supra-aural headphones or on-ear headphones have pads that press against the ears, rather than around them. They were commonly bundled with personal stereos during the 1980s. This type of headphone generally tends to be smaller and lighter than circumaural headphones, resulting in less attenuation of ...

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  7. Eustachian tube - Wikipedia

    en.wikipedia.org/wiki/Eustachian_tube

    Upper respiratory system, showing entrance to auditory tube near middle The Eustachian tube has recently been redefined as the fibrocartilaginous structure connecting the air cell system of the temporal bone to the nose. What was thought of as the bony tube is really part of the air cell system of the temporal bone.

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