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  2. Soundproofing - Wikipedia

    en.wikipedia.org/wiki/Soundproofing

    A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...

  3. Noise control - Wikipedia

    en.wikipedia.org/wiki/Noise_control

    An effective model for noise control is the source, path, and receiver model by Bolt and Ingard. [9] Hazardous noise can be controlled by reducing the noise output at its source, minimizing the noise as it travels along a path to the listener, and providing equipment to the listener or receiver to attenuate the noise.

  4. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    This is because an engine's cyclic nature makes analysis and noise cancellation easier to apply. Modern mobile phones use a multi-microphone design to cancel out ambient noise from the speech signal. Sound is captured from the microphone(s) furthest from the mouth (the noise signal(s)) and from the one closest to the mouth (the desired signal).

  5. The big-ticket items to bookmark for October Prime Day - AOL

    www.aol.com/big-ticket-items-bookmark-october...

    Peloton Indoor Exercise Bike 15% OFF. ... These earbuds have active noise cancellation and offer 360-degree audio for immersive sound. HD Voice Technology separates your voice from surrounding ...

  6. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    The Outdoor–Indoor Transmission Class (OITC) is a standard used for indicating the rate of sound transmission from outdoor noise sources into a building. It is based on the ASTM E-1332 Standard Classification for Rating Outdoor-Indoor Sound Attenuation. [ 37 ]

  7. Noise regulation - Wikipedia

    en.wikipedia.org/wiki/Noise_regulation

    However, Charlotte, NC (Sec. 15-69) limits indoor levels to 55 dB(A) between 9 am to 9 pm and 5 dB less at other times, but only from sound reproducing devices. Salt Lake Valley Health Department (Chapter 4), Minneapolis, MN (Chapter 389), and Albuquerque, NM (Article 9) use levels to existing ambient to define a violation.

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