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Under conditions of a temperature inversion (temperature increasing with increasing height), the sound waves will be refracted downwards, and therefore may be heard over larger distances. This frequently occurs in winter and at sundown. For instance, the Nine O'Clock Gun in Vancouver has been heard up to 45 miles away under the proper atmospheric conditions.
Originally posted by Adaleiz
well after reading this thread Id like to call for anyone who had self made videos or video files (or perhaps If you wanna save me some time, just an audio file?) to upload them to mediafire so I can run harmonic spectral analysis on the audio. (in other words, find out what frequencies are in the audio and the DB levels in relative terms) obviously the widest and longest band of color would be the target frequency.. I may even be able to isolate that frequency specifically.
This would no doubt in my mind this will shed some amount of light...on a noise. lol, ironic? I think so.
I can tell you this, It cannot possibly be an infrasonic frequency (for those who know what that is and may have thought it as a theory) for 1) Infrasonic frequencies are ofc able to be picked up by the human ear, however the brain is never given a realization that they're there (unless at moderately high DB levels, in which you would feel a vibration or pounding feeling in your chest as opposed to 'hearing' it.(however id like to note that the vibrating or pounding feeling that you can feel within your body occurs at around 120-140dbs, however this is only in the case that the frequency(s) can be processed/interpreted by the brain. If it were to be an infrasonic sound the db level can be much much lower.)
Secondly is this; (most) Camera's cannot record infrasonic frequencies, and Speaker systems in TVs and computers cannot play back the infrasound component. (most speakers have a much narrower dynamic range output than a humans' dynamic hearing range) and even if it did, you wouldn't hear it. Lets say this is indeed an infrasonic sound (even though my deduction is logical and sound), then only a harmonic spectral analysis would reveal that. the reason I say harmonic is because unlike magnitude(amplitude) spectral analysis, harmonic spectral analysis can estimate the specific frequencies within the audio waveform.
So please, contriboot some sound or video files with the sound.. I'll give you what I can.
Originally posted by odinson
Check out the thread conversations with a 6 year old. Just like in the movie Independence Day, there was a message hidden in the signal. Some people tried to break it down but no luck. For some reason only young kids can hear it. When I played it it gave me a head ache.