“Next to a full body apparition on video, capturing EVPs (Electronic Voice Phenomena) is the Holy Grail of most paranormal investigators,” writes Patricia Marin for the Ghost Hunting Examiner.
By definition Electronic voice phenomena (EVP) are electronically captured sounds that resemble speech, but are not the result of intentional voice recordings. Common sources include static, stray radio transmissions and background noise. Some people claim these sounds are of paranormal origin, while there are natural explanations such as apophenia (finding significance in insignificant phenomena), auditory pareidolia (interpreting random sounds as voices in their own language), equipment artifacts, or simple hoaxes. Recordings of electronic voice phenomena are often created from background sound by increasing the gain (i.e. sensitivity) of the recording equipment. (Source)
“There’s nothing quite like that thrill you get the first time you realize you have actually captured a voice from spirit, especially when it’s clear, distinct, and relevant,” writes Marin.
“Initially, you can’t quite believe it and you look for mundane explanations first. Could it have been another investigator, someone else at the site, a member of the film crew, a snippet of a forbidden cell phone conversation, a TV blaring in the background, a stray radio signal? You check out each possible explanation carefully, eliminating them one by one. Finally, you’re left with no other plausible explanation other than you truly HAVE recorded the voice of someone unseen,” writes Marin.
Read the full EVP-finding article here