1. Abstract
In our group we are collaborating in the research of the principles of the manifestation of ghost imprints in audio, image and video signals. We conducted an abundance of experiments with very similar outcomes. More or less the voices and images seem to pour out everywhere while the used technique does not seem to play the major role always. The main question for me from a more mundane point of view still is where in the chain of noise generation, signal conveying, transformation and reception is the place and the moment where the spirits break through to manipulate the signal