There is a lot to say about EVPs (Electronic Voice Phenomena), basically it consists on recording audio on some place that may have manifested paranormal activity, but isolating the ambient sounds as much as possible (people, cars, etc), then, stop and playing again what was recorded but with the volume way higher, so even the most lowest sound could be heard, and sometimes there seems to be messages of some people already dead.
In the old times, old magnetic tape recorders where used, it was recommended to use a virgin tape, so there would be better sound quality and lower interferences from something previously recorded. Later, when digital recorders started to appear, they also were used to record EVPs, and there began to appear even 'better' techniques to record EVPs with Digital Equipment.
One of the new methods to record EVPs with Digital Equipment was turning a TV, radio, or something on in a way that it would produce static noise (known as White Noise), this was because of a theory that said spirits needed some sort of energy in order to manipulate it, so, to produce sound, they would need sound already to manipulate it, some of this 'concept' is also belived to be used on the Ouija Board, so it made sense, but it had a few problems, one is that the Pareidolia effect (when the human mind tries to make sense of something random in this case) was the biggest origins of the supposed EVPs, basically, giving a tape of this kind to 10 separated people for EVP analysis, there would basically be 10 different phrases/words in 10 different parts of the tape.. or by the other hand, when this 10 people would came to the same conclusion, the same phrase/word on the same part of the tape, it was probably of a second possible problem of this kind of EVPs, that is because when they tunned th TV or Radio to play static, actually, it may had captured sound from an emitting station for a few seconds with very weak quality... so, we may assume that White Noise is a bad idea right? Well, not yet, since there is a even newer method, that works much better, and with less problems!
This new-age method already requires a computer, basically, the white noise is not generated anymore by a TV or radio where there is the possibility to cross with some station, but it is generated with as much variations as possibly by a computer formula for a second or two, and that pattern repeats it self for as long as we want, so there is no way of any external interference, and even the Pareidolia effect is much less interfering since if our brain doesnt make sense of the white noise on the first seconds, it wount do any at all after that, because we are repeating over and over again those same seconds. And if this isn't "cool" enough, nor problem-solver enough, there is even a step two, that is using the computer software to remove again the white noise from our recording and only leaving the parts of the sound that were modified, in this way, we are absolutely sure that those sounds where created by external phenomena, even if it is only the remaining of a bird singing some dozens of meters away, but in this way we have all of the analyze reduced by 80% / 90%, and without any of the already referred problems, so a much better analyze may be given to the really interesting parts.
Also, in any of the methods, to reduce the Pareidolia effect, the investigator that make the recording / analyze, should not be informed of details of the supposed "hunting" spirit that they may be after, otherwise, even if not self-conciuous, the investigator may instead of analyze, may try to find the information on the recordings, even where it actually doesn't exist, and he may skip and misunderstand some real messages. The investigator should only be informed of details of the supposed spirit or owner of the place, or whatever , after the analyze, then he may re-analyze again and compare. Also yet, the questions asked during the recording, must be simple as possible, and without any concrete details. Never assume the origin of something without having all the possible informations first.
I'll discuss here some other tools on the next post...
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