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  1. A noise-canceling microphone is a microphone that is designed to filter ambient noise . Technical details. The development is a special case of the differential microphone topology most commonly used to achieve directionality.

  2. For the reduction of a sound's volume, see Soundproofing. For the noise reduction of machinery and products, see Noise control. Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree.

  3. The five most abundant greenhouse gases in Earth's atmosphere, listed in decreasing order of average global mole fraction, are: [5] [6] water vapor, carbon dioxide, methane, nitrous oxide, ozone. Other greenhouse gases of concern include chlorofluorocarbons (CFCs and HCFCs ), hydrofluorocarbons (HFCs), perfluorocarbons, SF. 3.

  4. Avatar: The Last Airbender, also known as Avatar: The Legend of Aang in some regions, is an American animated fantasy action television series created by Michael Dante DiMartino and Bryan Konietzko and produced by Nickelodeon Animation Studio .

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