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  2. Auditory hallucination - Wikipedia

    en.wikipedia.org/wiki/Auditory_hallucination

    An auditory hallucination, or paracusia, [1] is a form of hallucination that involves perceiving sounds without auditory stimulus. While experiencing an auditory hallucination, the affected person hears a sound or sounds that did not come from the natural environment. A common form of auditory hallucination involves hearing one or more voices ...

  3. Electronic voice phenomenon - Wikipedia

    en.wikipedia.org/wiki/Electronic_voice_phenomenon

    e. Within ghost hunting and parapsychology, electronic voice phenomena ( EVP) are sounds found on electronic recordings that are interpreted as spirit voices. Parapsychologist Konstantīns Raudive, who popularized the idea in the 1970s, described EVP as typically brief, usually the length of a word or short phrase. [1]

  4. Audio feedback - Wikipedia

    en.wikipedia.org/wiki/Audio_feedback

    To maximize gain before feedback, the amount of sound energy that is fed back to the microphones must be reduced as much as is practical.As sound pressure falls off with 1/r with respect to the distance r in free space, or up to a distance known as reverberation distance in closed spaces (and the energy density with 1/r²), it is important to keep the microphones at a large enough distance ...

  5. ‘I’ve had 16 free batteries’: This Florida woman used ...

    www.aol.com/finance/ve-had-16-free-batteries...

    According to an older video that is now trending from the streaming service Growing Bolder, Rachel Veitch maintained her 1964 Mercury Comet Caliente for 43 years — and saved money on it by using ...

  6. Audio-to-video synchronization - Wikipedia

    en.wikipedia.org/wiki/Audio-to-video_synchronization

    v. t. e. Audio-to-video synchronization ( AV synchronization, also known as lip sync, or by the lack of it: lip-sync error, lip flap) refers to the relative timing of audio (sound) and video (image) parts during creation, post-production (mixing), transmission, reception and play-back processing. AV synchronization can be an issue in television ...

  7. Why sudden loud booms sometimes occur when it's very ... - AOL

    www.aol.com/weather/why-sudden-loud-booms...

    During extreme cold events, you may hear a loud boom and feel like you have experienced an earthquake. However, this event was more likely a cryoseism, also known as an ice quake or a frost quake ...

  8. Marshall Amplification - Wikipedia

    en.wikipedia.org/wiki/Marshall_Amplification

    This allowed for a "classic Marshall" level of gain to be footswitched up to a modern, medium to high gain sound, slightly darker and higher in gain than the brasher JCM800 sound that typified 1980s rock music. "The sound of these amps is particularly thick and dark, even on the Marshall scale of things. The gain by today's standards is medium."

  9. Acoustic trauma - Wikipedia

    en.wikipedia.org/wiki/Acoustic_trauma

    Audiology. Acoustic trauma is the sustainment of an injury to the eardrum as a result of a very loud noise. Its scope usually covers loud noises with a short duration, such as an explosion, gunshot or a burst of loud shouting. Quieter sounds that are concentrated in a narrow frequency may also cause damage to specific frequency receptors. [1]