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  2. Walla - Wikipedia

    en.wikipedia.org/wiki/Walla

    In American radio, film, television, and video games, walla is a sound effect imitating the murmur of a crowd in the background. [1] A group of actors brought together in the post-production stage of film production to create this murmur is known as a walla group.

  3. Noise barrier - Wikipedia

    en.wikipedia.org/wiki/Noise_barrier

    The sound tube in Melbourne, Australia, designed to reduce roadway noise without detracting from the area's aesthetics.. A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution.

  4. Wallah - Wikipedia

    en.wikipedia.org/wiki/Wallah

    Wallah, -walla, -wala, or -vala (-wali fem.), is a suffix used in a number of Indo-Aryan languages, like Hindi/Urdu, Gujarati, Bengali or Marathi. It forms an adjectival compound from a noun or an agent noun from a verb. [ 1 ]

  5. 11 photos of America's fighter jets breaking the sound barrier

    www.aol.com/article/2016/03/07/11-photos-fighter...

    At a speed of about 767 miles per hour, depending on temperature and humidity, a moving object will break the sound barrier. It was not until World War II, when aircraft started to reach the ...

  6. List of onomatopoeias - Wikipedia

    en.wikipedia.org/wiki/List_of_onomatopoeias

    This is an accepted version of this page This is the latest accepted revision, reviewed on 2 December 2024. This is a list of onomatopoeias, i.e. words that imitate, resemble, or suggest the source of the sound that they describe. For more information, see the linked articles. Human vocal sounds Achoo, Atishoo, the sound of a sneeze Ahem, a sound made to clear the throat or to draw attention ...

  7. Acoustic shadow - Wikipedia

    en.wikipedia.org/wiki/Acoustic_shadow

    A short-distance acoustic shadow occurs behind a building or a sound barrier. The sound from a source is shielded by the obstruction. Due to diffraction around the object, it will not be completely silent in the sound shadow. The amplitude of the sound can be reduced considerably, however, depending on the additional distance the sound has to ...

  8. Sound baffle - Wikipedia

    en.wikipedia.org/wiki/Sound_baffle

    A sound baffle is a construction or device which reduces the strength (level) of airborne sound. Sound baffles are a fundamental tool of noise mitigation, the practice of minimizing noise pollution or reverberation. An important type of sound baffle is the noise barrier constructed along highways to

  9. Walla (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Walla_(disambiguation)

    Walla is a sound effect imitating the murmur of a crowd in the background. Walla may also refer to: Walla! Communications Ltd, Israeli internet company; August Walla (born 1936), Austrian art brut artist; Chris Walla (born 1975), American musician; Walla Brook, three streams on Dartmoor, England