A BBC piece examines EVP — Electronic Voice Projection — or the alleged recording of spirit voices on tape or digital recorders.
The simplest explanation is that EVP voices are just stray radio transmissions. Usually they are so faint and masked by static interference that it’s hard to make out what they are saying, and the EVP investigator has to “interpret” them for you.
That might seem like a weakness but that’s also their power. As Joe Banks, a sound artist, points out, a dead person speaking in studio quality wouldn’t be nearly so convincing as a voice you must strain to hear.
Banks has an ongoing project called Rorschach Audio. He suggests that the voices are the aural equivalent of inkblot tests devised by Swiss psychologist Hermann Rorschach. He argues that while the EVP experimenters think they are doing parapsychology, they are actually unwittingly carrying out psychology experiments.