It's always intrigued me how an EVP can be picked up on a recorder but yet usually nobody will hear it with their own ears at the time it was recorded. Numerous theories exist as to the origin of an EVP, but none have been proven yet. Perhaps one of these days as the field of paranormal research grows, we will one day understand.
What we do know is that sound is energy. Energy in the fact that the air is vibrating to make a noise. The number of times the air vibrates a second is called a sound wave. The number of times a sound wave vibrates is called its frequency. Frequency is measured in hertz. The lower the hertz, the softer the sound. Since EVP's are very soft, they are always considered for the most part to originate around the lower hertz range - around 20Hz or lower. 20Hz is about the lowest frequency that the human ear can hear. I think that humans are close to being able to hear these EVP's but they just fall out of the range of our hearing. With recorders and the sensitive electronic circuitry in them, these devices are more sensitive to change in the air and this allows us to "hear" an EVP through it when we play it back.
Are EVP's the voices of the deceased? Or perhaps just residual "voices of the past" that seem stuck in our time? Who knows. That is another subject all on its own to be blogged about in a future post.
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