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  2. Soundproofing Against Outdoor Noise - AOL

    www.aol.com/news/2010-08-02-how-to-beat-outdoor...

    Scott Warrick of Bloomington, Ind. has a noise problem outside his house: jackhammers. "I'm enduring three months of daily jackhammering as they tear down a local school." Excessive noise entering ...

  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. Noise control - Wikipedia

    en.wikipedia.org/wiki/Noise_control

    Electric and hybrid vehicles could reduce noise pollution, but only if those vehicles make up a high proportion of total vehicles on the road; even if traffic in an urban area reached a makeup of fifty percent electric vehicles, the overall noise reduction achieved would only be a few decibels and would be barely noticeable. [12]

  5. Sound masking - Wikipedia

    en.wikipedia.org/wiki/Sound_masking

    A sound masking system can be used to reduce the impression of intruding sound (reducing annoyance, distraction) and improve acoustic privacy (including speech privacy). However, there is a fundamental misconception in the deployment of a sound masking system in treating areas where there is a failure to appreciate the difference between the ...

  6. Acoustical engineering - Wikipedia

    en.wikipedia.org/wiki/Acoustical_engineering

    Noise control is a set of strategies to reduce noise pollution by reducing noise at its source, by inhibiting sound propagation using noise barriers or similar, or by the use of ear protection (earmuffs or earplugs). [20] Control at the source is the most cost-effective way of providing noise control.

  7. Noise pollution - Wikipedia

    en.wikipedia.org/wiki/Noise_pollution

    The CityLink sound tube in Flemington, Melbourne, Australia, is designed to reduce roadway noise without detracting from the area's aesthetics. A man inserting an earplug in his ear to reduce the noise exposure. The Hierarchy of Controls concept is often used to reduce noise in the environment or the workplace. Engineering noise controls can be ...

  8. Why Does My Dog Bark at Nothing? A Trainer Explains the Truth

    www.aol.com/lifestyle/why-does-dog-bark-nothing...

    The fundamental frequency of mice is known to be around 40,000 Hz, while dogs can hear up to 60,000 Hz. This is much higher than a human’s hearing range, making these ultrasonic vocalizations ...

  9. 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 ...

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