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  2. Compression artifact - Wikipedia

    en.wikipedia.org/wiki/Compression_artifact

    Also, quantization noise can be "hidden" where they would be masked by more prominent sounds. With low compression, a conservative psy-model is used with small block sizes. When the psychoacoustic model is inaccurate, when the transform block size is restrained, or when aggressive compression is used, this may result in compression artifacts.

  3. Is your Facebook making noises? Why the mobile app is now ...

    www.aol.com/facebook-making-noises-why-mobile...

    Turning off the In-App Sound feature will end the chirping as well as the noises users hear when pressing the Like, Comment and Share buttons. But users will still be able to hear sound from videos.

  4. Salt-and-pepper noise - Wikipedia

    en.wikipedia.org/wiki/Salt-and-pepper_noise

    An effective noise reduction method for this type of noise is a median filter [2] or a morphological filter. [3] For reducing either salt noise or pepper noise, but not both, a contraharmonic mean filter can be effective. [4] Linear filters are generally ineffective for removing impulse noise. [1]

  5. Image noise - Wikipedia

    en.wikipedia.org/wiki/Image_noise

    Image noise is random variation of brightness or color information in images, and is usually an aspect of electronic noise. It can be produced by the image sensor and circuitry of a scanner or digital camera. Image noise can also originate in film grain and in the unavoidable shot noise of an ideal photon detector. Image noise is an undesirable ...

  6. 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 ...

  7. Dark-frame subtraction - Wikipedia

    en.wikipedia.org/wiki/Dark-frame_subtraction

    Noise from the image sensor include hot pixels, which light up more brightly than surrounding pixels. The technique works by taking a picture with the shutter closed and subtracting that electronically from the original photo exhibiting the noise. Dark-frame subtraction has been applied to the left half of the image.

  8. Comfort noise - Wikipedia

    en.wikipedia.org/wiki/Comfort_noise

    the speech may sound "choppy" (see noise gate) and difficult to understand the sudden change in sound level can be jarring to the listener. To counteract these effects, comfort noise is added, usually on the receiving end in wireless or VoIP systems, to fill in the silent portions of transmissions with artificial noise.

  9. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    Clear your browser's cache to reset your browser and wipe out all the little unwanted bits of info that have been stored, making it overall run better. Fix problems with missing emails When emails go missing in AOL Mail, it's often due to a few simple things; either the message is in the wrong folder, your third-party mail client's settings, or ...