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  2. Acoustic quieting - Wikipedia

    en.wikipedia.org/wiki/Acoustic_quieting

    Sound reflections: by limiting the reflection using many methods, e.g. by using acoustic absorption (deadening) materials, trapping the sound, opening a "window" to let sound out, etc. By analyzing the entire sequence of events, from the source to the observer, an acoustic engineer can provide many ways to quieten the machine.

  3. 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 ...

  4. Acoustic foam - Wikipedia

    en.wikipedia.org/wiki/Acoustic_foam

    Acoustic foam tiles are suited to placing on sonically reflective surfaces to act as sound absorbers, thus enhancing or changing the sound properties of a room. [ 11 ] This type of sound absorption is different from soundproofing, which is typically used to keep sound from escaping or entering a room rather than changing the properties of sound ...

  5. Sound suppression system - Wikipedia

    en.wikipedia.org/wiki/Sound_Suppression_System

    The launch pad built by the Soviet Union beginning in 1978 at the Baikonur Cosmodrome for launching the Energiya rocket included an elaborate sound suppression system which delivered a peak flow of 18 cubic metres (4,800 US gal) per second fed by three ground level reservoirs totaling 18,000 cubic metres (4,800,000 US gal).

  6. Anechoic tile - Wikipedia

    en.wikipedia.org/wiki/Anechoic_tile

    An additional benefit of the coating was it acted as a sound dampener, containing the U-boat's own engine noises. [1] Alberich tiles as they appear on U-480. The coating had its first sea trials in 1940, on U-11, a Type IIB. [1] [5] U-67, a Type IX, was the first operational U-boat with this coating. [2]

  7. Acoustic panel - Wikipedia

    en.wikipedia.org/wiki/Acoustic_panel

    An acoustic board is a board made from sound absorbing materials, designed to provide sound insulation. [3] [4] Between two outer walls sound absorbing material is inserted and the wall is porous. Thus, when sound passes through an acoustic board, the intensity of sound is decreased. The loss of sound energy is balanced by producing heat energy.

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