Electronic Voice Phenomenon
Electronic voice phenomena (EVP) are electronically generated noises that resemble speech, but are supposedly not the result of intentional voice recordings or renderings. Common sources of EVP include static, stray radio transmissions, and background noise. Recordings of EVP are often created from background sound by increasing the gain (i.e. sensitivity) of the recording equipment.
Interest in EVP surrounds claims that it is of paranormal origin, although many occurrences have had natural explanations including apophenia (finding significance in insignificant phenomena), auditory pareidolia (interpreting random sounds as voices in one's own language), equipment artifacts, and hoaxes.
Parapsychologist Konstantin Raudive, who popularized the idea, described EVP as typically brief, usually the length of a word or short phrase.
Read more about Electronic Voice Phenomenon: History, Explanations and Origins, Organizations That Show Interest in EVP, Cultural Impact
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