posted on May, 1 2012 @ 05:22 PM
It's been happening in my area for about a year so I'm not sure if the spreading of the noise is related to an increase in frequency or an increased
awareness. This weekend it was a little louder than usual and I could hear a distinct pattern almost like a rumble followed by a tuning fork that
repeats, all of this accompanied by the usual jet plane in limbo background ambient noise.
For three evenings I placed a recording device on the window sill and left it on record, yesterday I downloaded the sounds and played them back in
windows media player. As a point of reference I used the "bars" visual enhancement (the bouncing vertical lines that move up and down with the
music) and left the sound exactly as recorded.
On playback I noticed an obvious underlying tone, no doubt because the use of headphones was now blocking out the outside noises. I opened the
"equalizer" enhancement (ten individual adjustments from low or bass level at 31Hz to hi or treble at 16KHz) and moved them around a little. What I
found was quite shocking.
The sounds seem to dwell mostly in the extreme low and extreme high of the audio spectrum, if I take the EQ adjustments to bottom on all 10
frequencies the obvious sound and visual bars drop close to zero. Raising the 62Hz, 125Hz, 4KHz and 8KHz had little or no effect. I took all the bars
back down to bottom and raised ONLY the 31Hz all the way up and the entire video and audio spectrum came back (all the bars on the visual went up) not
just the left side or bass frequencies.
I took all of the adjustments back down and this time manipulated only the 16KHz frequency, as soon as I did this an ear piercing high pitched screech
came out, so loud and harsh I could only listen for a few seconds because it was hurting my ears. With this adjustment only one bar of lights was
visible at the far right side (treble tones) unlike the 31Hz reaction. Even though I knew the answer I checked my work by playing a variety of music,
vocal and natural sounds to see if I could duplicate the reaction but nothing else showed a similar response.
I'm hesitant to play this on anything but the computer because I don't want to damage my audio equipment, if anyone has the knowledge or equipment
to take this further let me know and I'll try to find a way to post the sound file.