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  2. Norfolk Public Schools - Wikipedia

    en.wikipedia.org/wiki/Norfolk_Public_Schools

    About 4,400 students (2023–24 school year) [1] Teachers. About 2,590 (FTE) [1] Other information. Mission. The Cornerstone of a Proudly Diverse Community. Website. www.npsk12.com. The Norfolk Public Schools, also known as Norfolk City Public Schools, are the school division responsible for public education in the United States city of Norfolk ...

  3. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Noise-cancelling headphones are headphones that suppress unwanted ambient sounds using active noise control (ANC). Active noise cancellation makes it possible to listen to audio content without raising the volume excessively. In an aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than ...

  4. Montgomery Public Schools - Wikipedia

    en.wikipedia.org/wiki/Montgomery_Public_Schools

    Montgomery Public Schools is a school district headquartered in Montgomery, Alabama, United States. The current Superintendent of Montgomery Public Schools is Melvin Brown. [1] The district serves the city of Montgomery and surrounding Montgomery County. It is the third largest district in Alabama, with 31,743 students enrolled. [2]

  5. Savannah-Chatham County Public Schools - Wikipedia

    en.wikipedia.org/wiki/Savannah-Chatham_County...

    The Savannah-Chatham County Public School System (SCCPSS) is a public school district in Chatham County, Georgia, United States. SCCPSS is run by an elected Board of Public Education and operates most all of the public schools in Chatham County, including those in the city of Savannah. [2] It is the sole public school district in the county. [7]

  6. Are Noise-Canceling Headphones Harmful to Your Ears? - AOL

    www.aol.com/noise-canceling-headphones-harmful...

    Key Takeaways: As the FDA does not regulate headphone volume, it’s up to us to self-regulate our listening volume. Noise canceling headphones can help keep your volume within a safe range, so ...

  7. Richmond Public Schools - Wikipedia

    en.wikipedia.org/wiki/Richmond_Public_Schools

    www.rvaschools.net. Richmond Public Schools is a public school district located in the independent city of Richmond, Virginia. It is occasionally described locally as Richmond City Public Schools to emphasize its connection to the independent city rather than the Richmond-Petersburg region at large or the rural Richmond County, Virginia.

  8. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

  9. 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 ...

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