Can You Hear Them? ... Listen... The Dead Do Speak Sometimes, But Only In Whispers. EVP's, also called Electronic Voice Phenomena Research. "EVP" is a process whereby unexplained snatches of voice or voices are embedded onto magnetic recording tape by a process that is not yet fully understood. The embedded "ghost" voice can be heard when the magnetic audio tape is played back on a standard tape recorder/player.” Attempts to contact the dead have persisted through the ages, but interest in using technology to speak with the deceased arose during the early 20th century. In the 1920s, the great American inventor Thomas Edison told a reporter for Scientific American that he was working on creating a machine that could contact the dead. Ghost voices or actual spirit sounds and recordings that typically last only for a few seconds.
RECORDING EVP
The quality, volume and durations of recordings are said to be increased by using a sound source placed within audible distance of the microphone during recording. Typically this would be a radio tuned to between stations so only white noise is audible; the theory being that this provides an acoustic basis for the voices to be constructed from, similar to vocoder technology.
This need for background noise fits the alternative explanation that the white noise provides random sounds that may be interpreted as voices by people who expect or want to hear voices. This explanation is consistent with the theory that the entire "phenomenon" is an example of pareidolia, in which a vague or random stimulus is mistakenly perceived as recognizable (see the skeptic section). Voices are said to be known for being rapid, faint, and often spoken in grammatically unusual and simplified language—or even multiple languages during the same sentence. The interpretation of such recordings is often highly subjective and may differ from listener to listener; some listeners may hear nothing at all, while others report hearing specific phrases or sentences.