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  2. Noise barrier - Wikipedia

    en.wikipedia.org/wiki/Noise_barrier

    Noise barriers have been built in the United States since the mid-twentieth century, when vehicular traffic burgeoned. I-680 in Milpitas, California was the first noise barrier. [1] In the late 1960s, analytic acoustical technology emerged to mathematically evaluate the efficacy of a noise barrier design adjacent to a specific roadway. By the ...

  3. Unsilent Night - Wikipedia

    en.wikipedia.org/wiki/Unsilent_Night

    The Village Voice claimed that it is "a shimmering sound-wall of bells and chimes that is dreamlike to wander through in the December nip." [ 28 ] Of the recorded CD version available on Cantaloupe Music , The New York Times stated that Unsilent Night "immerses the listener in suspended wonderment, as if time itself had paused inside a string ...

  4. 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.

  5. Acoustic mirror - Wikipedia

    en.wikipedia.org/wiki/Acoustic_mirror

    The Maltese sound mirror is known locally as "the ear" . The ... one is a long curved wall about 5 m (16 ft) high by 70 m (230 ft) long, while the other two are dish ...

  6. Paint on the faux-brick sound walls along Interstate 440 is proving to be particularly hard to remove. Roadside graffiti is on the rise. On Raleigh’s Beltline, it poses a special challenge.

  7. Architectural acoustics - Wikipedia

    en.wikipedia.org/wiki/Architectural_acoustics

    Fabric can be wrapped around substrates to create what is referred to as a "pre-fabricated panel" and often provides good noise absorption if laid onto a wall. Prefabricated panels are limited to the size of the substrate ranging from 2 by 4 feet (0.61 m × 1.22 m) to 4 by 10 feet (1.2 m × 3.0 m).

  8. Noise control - Wikipedia

    en.wikipedia.org/wiki/Noise_control

    The most fertile areas for roadway noise mitigation are in urban planning decisions, roadway design, noise barrier design, [14] speed control, surface pavement selection, and truck restrictions. Speed control is effective since the lowest sound emissions arise from vehicles moving smoothly at 30 to 60 kilometers per hour.

  9. Sound baffle - Wikipedia

    en.wikipedia.org/wiki/Sound_baffle

    Sound baffles on the wall of a recording studio. 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