Greetings

[specterquest]

Hi Folks,
First, hello to all. I am the founder of a paranormal research group based in Ohio, specterquest.com
EVPs (Electronic Voice Phenomena) digital recordings would have to be my personal interest as far as the tech side goes in an investigation.
Although I know some of the basics of sound waves, audio capturing etc. I have so many more questions.
I don't know if this is the venue to ask these questions? However, it doesn't hurt to meet other folks anywhere you go.
If in fact this is the right place. Here's a question that maybe someone could answer for me.
If a sound is made at 358Hz (well within the human hearing range), how is it that on the spectrum it registers at 0db? And the sound wasn't heard audibly by the investigator? I speculated that because it takes Decibels to move the sound sufficiently enough for the human to hear. No Decibels, no movement, no hear. Is this correct?
I'm looking forward to hopefully hearing from someone on this matter/
Specterquest (Jeffrey)

 

[Seth=L]

You are right about no decibels, no movement, no sound. Why 358 Hz?

 

[specterquest]

358HZ was the highest peak on the spectrum analysis chart. This is the part that I don't quite understand. If you have a reading like 300+Hz, why wouldn't you have some type of movement?
Thanks for your feedback...
Jeffrey

 

[3db]

358HZ was the highest peak on the spectrum analysis chart. This is the part that I don't quite understand. If you have a reading like 300+Hz, why wouldn't you have some type of movement?
Thanks for your feedback...
Jeffrey

Are you saying that you recorded a 358Hz tone using your digital recorder but didn't hear the sound? Did I get that right?

 

[Audioholics]

Hz = the frequency of the sound, but dB = the volume or loudness of the sound. 358Hz remains just a number until it is actually amplified. Once that happens you can quantify the level of dB (and there are many types of dB qualifications)

You also have two very important issues: 1) What is the ambient room noise where you are recording? and 2) If your measuring equipment isn't sufficiently detailed enough to capture the resolution required to analyze a characteristic frequency pattern that exists within a noise band (room ambience) you won't get very helpful results. In an anechoic chamber you may be able to record a gnat farting, but in a typical room, ambient noise masks almost anything below that level unless it has frequency characteristics not found in the noise.

 

[Seth=L]

Let me get this right... You are reading a frequency of 300 hz (hypothetically) but the decibel meter reads "0dB"? Maybe its just where the meter settles when nothing is moving.

 

[Seth=L]

Ambient noise was sorta my line of thought, but I don't exactly understand what he is trying to read. Did you calibrate the meter to not apply decibel ratings to anything below room ambience?

 

[majorloser]

In an anechoic chamber you may be able to record a gnat farting....

LOL

Do you think Audioholics could get some research funding to test this theory?