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EVP Classifications

EVP classification, or classifying electronic voice phenomena varies, as different EVP classification scales are used by ghost investigation groups. 

EVP are ghostly voices recorded from typically within a haunted environment, and are not usually audibly heard during the EVP recording session.  It is important to first understand that there are different qualities of ghostly voices, thus an EVP classification scale is important.

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. 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."

Another version of EVP classification  gives even better break down of the EVP's recorded.  They chose to break down the EVP classification by type, level, and response clarification. 

Let us begin by listing the:

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. 
 
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.

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.

Other Information regarding EVP classification:
The AA-EVP found that most EVP messages are recorded more frequently in the evening and/or during stormy weather (best times for ghost hunting).  Most EVP messages are typically short in length, preceded by a click or thud sound, are usually in the language of the experimenter being delivered in a single voice (male or female), and exhibit a frequency shift different from the normal human voice frequency range.