• Christina Corsetti, H.S.

Electronic Voice Phenomenon (EVPs)

Updated: Oct 10, 2020


EVP's are ghostly voices recorded from, typically a haunted environment and are not usually audibly heard during the EVP's recording sessions.


EVP or "electronic voice phenomena" (electronic voice phenomenon ) was discovered in 1959 by Swedish film producer Friedrich Juergenson, though, Thomas Edison was said to have theorized about EVP in the 1920s. Other men in the 1930's, 40's and 50's reported some voice phenomena, but Freidrich has been considered the "Father of EVP" after recording hundreds of voices.


EVP's are the practice of playing back audio recordings to listen for human voices, that were not heard audibly during the recording session. Sometimes amplification and noise filtering is required to hear the voices. Some EVP's is more easily heard and than others. EVP's have been recorded of men, women, and children of varying ages, different languages, tones and emotions. EVP's are typically words, and short phrases. Sometimes EVP's may just be laughter, screams, groans, and other vocal noises.


EVP Classifications

Classification A EVP:  "A clear and distinct voice or sound that is universally accepted and undisputed, because it must be understood by anyone with normal hearing and without being told or prompted to what is being said or heard. It can be heard without the use of headphones." Classification B EVP:  "A voice or sound that is distinct and fairly loud. This class of voice is more common and can be heard by most people after being told what to listen for. It is usually audible to experienced persons who have learned the skill of listening to EVP's. It can sometimes be heard without the use of headphones." Classification C EVP:  "A faint and whispery voice or sound that can barely be heard and is sometimes indecipherable and unintelligible. It may have paranormal characteristics, such as a mechanical sound. Most investigators would apply objectivity and disregard it, but may save it for reference purposes."

EVP Classes


Class DC (direct communication): The ghost voice clearly answers a question or directly responds to something said. Class PC (personal communication): The ghost voice clearly says something meaningful directly to someone present. Class RC (random communication): A ghost voice that answers no direct question, does not appear to be aimed at any particular person and doesn't make sense in the context it was receive.

EVP Levels

Level 1: Loud, clear and easy to understand...sounds like natural speech (including whispers and fast speech). Level 2: Lower volume and the voice is warped, but still discernable. Level 3: Very low volume, hard to understand and excessively warped.

EVP Categories

Morph: The voice and/or words of someone who is speaking is changed into something else in the playback of the recording. Words that are different than the person who spoke, or one voice changing to another, etc. ERV (event related voices): Events such as someone talking or coughing, or the sounds of a passing train or car, etc. seems to trigger the EVP. TR (thread related): One utterance is a comment on, or a response to, an utterance just before. They are related by contextual thread. Examples would be hearing two or more voices talking to each other, as well as a voice responding to something previously said by itself and/or someone or something else. CHR (chorale): Two or more voices speaking at the same time, either saying the same thing or something different.


Most ghost hunters will ask questions during an EVP recording session. The ghost investigator should remain silent between questions, allowing ample time for answers and so as to not "pollute" the recording with his or her own sounds or words. Upon playback of the recording, the ghost hunter listens intently for any EVP's that may have been picked up by the recorder.  Sometimes, the sounds recorded during the silent time between questions is strange or unintelligible; but when slowed down in EVP editing software, a word or message can be discerned.  

Some EVP messages that have been recorded are startling.  EVP's, especially when a ghost responds accurately to questions that correlate to the haunted location or even the questioner, can be startling.  Personal information about people in the room, during EVP communications, may be given, from time to time, by ghosts or spirits.

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