EVP is the attempt to capture a ghost orspirits voice on audio recording tapes. Typically there is no voice heard to thepeople present in the recording but after reviewing the tapes there are strange voicesrecorded.

Sounds or voices recorded on magnetic tape which are only heard upon playback. Discovered by Konstantin Raudive. Usually recorded in a range from 0 – 300 Hz (Human speech is generally within 500-2000 Hz, and has never been recorded below 300 Hz).

Ghost voices, an attempt to capture ghosts or spirits voices on audio tape unheard to the human ear. EVP article EVP article