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 SneezingPenis
ACHOOOOOOOOO!!!!!111!
Registered: 01/16/05
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 Resonant frequencies 
#3828792 - 02/25/05 02:52 AM (17 years, 11 months ago) |
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I posted the equivalent to this in the MAaL forum about a story i am writing, but i thought this forum would have more fun with it.....
Everything has a resonant frequency, from glass to your colon. There is a note called "the brown note" which is 4hz at 160 dB , which will cause your colon to spasm and you will shit yourself. Now what I was thinking along these lines was other resonant frequencies of other organs...like the Pineal gland, which secretes DMT. If we could find its resonant frequency and cause it to "spasm" or whatever will happen, there is a chance that DMT would be released into the body inducing a real hard core trip.... have at it.
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 z@z.com
Libertarian
Registered: 10/13/02
Posts: 2,876
Loc: ATL
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I remember when I was living in a dorm and my roommate found a frequency that would make the entire building shake and it was very difficult to figure out exactly where the sound was coming from. Good times.
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"Of all tyrannies, a tyranny exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience." - C.S. Lewis
"I would rather be exposed to the inconveniencies attending too much liberty than to those attending too small a degree of it." - Thomas Jefferson
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DNKYD
Turtle!
Registered: 09/24/04
Posts: 12,326
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Mythbusters did a thing on the "brown note" and apparently it's just a myth.
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SneezingPenis
ACHOOOOOOOOO!!!!!111!
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Re: Resonant frequencies [Re: DNKYD]
#3829909 - 02/25/05 05:38 AM (17 years, 11 months ago) |
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Mythbusters only did it at 140 dB if i remember correctly. It needs to be done at 160 dB.
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Seuss
Error: divide byzero
Registered: 04/27/01
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> It needs to be done at 160 dB.
At 160 dB, it won't matter what frequency you use...
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Just another spore in the wind.
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DNKYD
Turtle!
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Re: Resonant frequencies [Re: Seuss]
#3832322 - 02/25/05 06:46 PM (17 years, 11 months ago) |
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They did it at 150 dB on the show, I think. So loud that if your eardrums are not protected they will be gone for good in a second.
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Seuss
Error: divide byzero
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Re: Resonant frequencies [Re: DNKYD]
#3832528 - 02/25/05 07:58 PM (17 years, 11 months ago) |
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> They did it at 150 dB
The dB scale is logrithimic, which means it increases faster the larger the number. The difference between 30 db and 40 db is very small compared to the difference between 150 db and 160 db. A 160 db of sound contains a lot of energy... enough to levitate objects using the compression waves producing the sound. (I have a NASA reference to levitating objects using sound if anybody is interested... and if I can find it again.)
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Just another spore in the wind.
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DNKYD
Turtle!
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Re: Resonant frequencies [Re: Seuss]
#3832615 - 02/25/05 08:22 PM (17 years, 11 months ago) |
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Yeah, post the link if you can find it. That seems pretty interesting.
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Seuss
Error: divide byzero
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Re: Resonant frequencies [Re: DNKYD]
#3832675 - 02/25/05 08:35 PM (17 years, 11 months ago) |
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Do a search for Servodrive, NASA, acoustic levitiation, etc...
http://www.prosoundweb.com/chat_psw/transcripts/danley.shtml:
Quote:
Charlie Hughes: What sort of power output & freq for the levitation, and what mass were you supporting?
Tom: Most of the levitation sources that I made ran at 21 KHz - a typical source that could produce a sound pressure of 165 dB @ 12 inches. An array of six can produce in excess of 175 dB at the center - which is enough to light a cigarette with acoustic friction.
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Just another spore in the wind.
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SneezingPenis
ACHOOOOOOOOO!!!!!111!
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Re: Resonant frequencies [Re: Seuss]
#3833796 - 02/26/05 01:34 AM (17 years, 11 months ago) |
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every +6 dB is perceived as double the sound (amplitude).
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newuser1492
Registered: 06/13/03
Posts: 3,104
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http://en.wikipedia.org/wiki/Decibel
Quote:
Under controlled conditions, in an acoustical laboratory, the trained healthy human ear is able to discern changes in sound levels of 1 dB, when exposed to steady, single frequency ("pure tone") signals in the mid-frequency range. It is widely accepted that the average healthy ear, however, can barely perceive noise level changes of 3 dB.
On this scale, the normal range of human hearing extends from about 0 dB to about 140 dB. 0 dB is the threshold of hearing in healthy, undamaged human ears; 0 dB is not an absence of sound, and it is possible for people with exceptionally good hearing to hear sounds at -10 dB. A 10 dB increase in the level of a continuous noise represents a perceived doubling of loudness; a 5 dB increase is a readily noticeable change, while a 3 dB increase is barely noticeable to most people.
Sound pressure levels are applicable to the specific position at which they are measured. The levels change with the distance from the source of the sound; in general, the level decreases as the distance from the source increases. If the distance from the source is unknown, it is difficult to estimate the sound pressure level at the source.
Quote:
Since the human ear is not equally sensitive to all the frequencies of sound within the entire spectrum, noise levels at maximum human sensitivity?middle A and its higher harmonics (between 2,000 and 4,000 hertz)?are factored more heavily into sound descriptions using a process called frequency weighting.
The most widely used frequency weighting is the "A-weighting", which roughly corresponds to the inverse of the 40 dB (at 1 kHz) equal-loudness curve. Using this filter, the sound level meter is less sensitive to very high and very low frequencies. The A weighting parallels the sensitivity of the human ear when it is exposed to normal levels, and frequency weighting C is suitable for use when the ear is exposed to higher sound levels. Other defined frequency weightings, such as B and Z, are rarely used.
Frequency weighted sound levels are still expressed in decibels (with unit symbol dB), although it is common to see the incorrect unit symbols dBA or dB(A) used for A-weighted sound levels.
Quote:
A level difference of ?3 dB is roughly double/half power (equal to a ratio of 1.995). That is why it is commonly used as a marking on sound equipment and the like.
The second quote basically states that human hearing is most sensitive in the 2000-4000hz range. Within which the human voice neatly falls.
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SneezingPenis
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Re: Resonant frequencies [Re: newuser1492]
#3835632 - 02/26/05 10:20 AM (17 years, 11 months ago) |
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Yes, i was wrong, it is +3 dB as double. I havent taken my psychoacoustic classes in so long it all gets jumbled in my head. The average threshold for human hearing though is -1/4 dB to 140 dB. That is printed in almost every psychoacoustic book.
There is a relative and an actual level of noise. This is where you get the difference between Pink noise
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SneezingPenis
ACHOOOOOOOOO!!!!!111!
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oops, and white noise
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MagicRooms
Hunter & Collector
Registered: 01/05/02
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Loc: Australia
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You are correct when you say everthing has a resonant frequency. There are also many Harmonic Frequencies for everything.........
This site is interesting http://www.altair.org/natradio.htm
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SneezingPenis
ACHOOOOOOOOO!!!!!111!
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Re: Resonant frequencies [Re: MagicRooms]
#3835800 - 02/26/05 12:08 PM (17 years, 11 months ago) |
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Think of the resonant frequency of the heart being used for war. What if our military used high powered transducers to explode mass amounts of peoples heart using a certain frequency. You could immobilize entire fields of enemies.
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automan
blasted chipmunk
Registered: 09/19/03
Posts: 8,272
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160db.... jesus christ... no matter what ear protection you had, how could you even breathe?
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No, no, you're not thinking, you're just being logical. ~ Niels Bohr
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newuser1492
Registered: 06/13/03
Posts: 3,104
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Re: Resonant frequencies [Re: automan]
#3836050 - 02/26/05 04:55 PM (17 years, 11 months ago) |
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http://www.termpro.com/asp/leaderboard3.asp
My friend hit a 153dB in an extra cab Mazda pickup. Sitting in the truck when it was turned up was so incredibly loud. If you put your head in front of the port you could feel the air compressing and decompressing almost painfully.
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ChuangTzu
starvingphysicist
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A highly coupled system has A resonant frequency. A loosely coupled system has A SET of resonant frequencies which depend on the individual resonant frequencies of all couplings in the system and the actual frequency they are oscillating at at any time. The efficiencies of these resonances in turn are less. A loosely coupled system loosely coupled to other loosely coupled systems (a pineal gland) is so inefficiently resonant and unstable that, even if you figured out which resonances were most efficient at that precise moment in time very little energy (relatively) would get transferred before the resonance shifted to its environment. Acoustically stimulating the pineal gland, and only the pineal gland, would be like trying to excite one atom of a water molecule in the middle of a lake...
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SneezingPenis
ACHOOOOOOOOO!!!!!111!
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Re: Resonant frequencies [Re: ChuangTzu]
#3838325 - 02/27/05 02:58 AM (17 years, 11 months ago) |
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yes, i had this talk with someone already, but with the use of multiple out of phase sources pointed at different firections, in time you could figure out a way to isolate unphased waves in a certain spot.
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Middleman
Registered: 07/12/99
Posts: 8,396
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read McKenna's True Halucinations and The Invisible Landscape... twice.
something about the buzzing sound of the insects, DMT + MAOI and superconductivity...
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daussaulit
Forgetful
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Re: Resonant frequencies [Re: automan]
#3867180 - 03/04/05 06:58 PM (17 years, 10 months ago) |
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4hz is out of the range for the human ear to detect.
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psilocyben
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Re: Resonant frequencies [Re: daussaulit]
#3874890 - 03/06/05 06:13 AM (17 years, 10 months ago) |
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someone told me about a bridge in california that has an armed guard ready to shoot any dogs seen walking on the bridge.
a dog's trot happens to fall within range of this bridge's resonant frequency.
i can't vouch for the credibility of the info.
it sounds unreasonable that they couldn't get a few engineers in there to alleviate the problem.
just thought it was kind of funny
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Zekebomb
sociophagus
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Re: Resonant frequencies [Re: psilocyben]
#3875386 - 03/06/05 08:40 AM (17 years, 10 months ago) |
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that sounds like bunk to me (yorkshire terrier trot = much different from saint bernard trot). but pretty funny and cool.
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chupucabras
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Re: Resonant frequencies [Re: daussaulit]
#3877333 - 03/06/05 10:26 PM (17 years, 10 months ago) |
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Quote:
daussaulit said:
4hz is out of the range for the human ear to detect.
Good point. It would be possible to use beat frequencies to 'entrain' your brainwaves to that frequency (with the Brainwave Generator software, I'm sure it's been discussed here before). But that only works with headphones, so I doubt you'd be able to get 160dB worth of 4Hz that way. Not that you'd really want to make yourself shit involuntarily...
Dan
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daussaulit
Forgetful
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Re: Resonant frequencies [Re: psilocyben]
#3877673 - 03/06/05 11:28 PM (17 years, 10 months ago) |
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when soldiers march on bridges they break step to prevent the march's resonant frequency from collapsing the bridge. It may be out of tradition, but I highly doubt that. I know there is this old bridge that was built in a valley. The wind blowing over the bridge was vibrating as the same resonant frequency. There are old B&W videos of it it swaying horribly and then collapsing.
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ChuangTzu
starvingphysicist
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Re: Resonant frequencies [Re: daussaulit]
#3881001 - 03/07/05 09:39 AM (17 years, 10 months ago) |
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A march doesn't have a resonant frequency, man. Just because a phrase sounds cool doesn't mean you should use it whatever chance you get : ) I think you just meant the frequency of the steps in the march. I think breaking step would just a good habit to be in because some floating bridges or long flimsy rope bridges in the jungle might be susceptible. I seriously doubt a column of marchers would bring down the golden gate bridge, for example.
As for that other bridge, the wind wasn't "vibrating" either. What was happening is basically the same thing as a violin bow rubbing a string. The wind, like the bow, moves steadily across the bridge. At some points it "sticks" and begins to push the bridge until the weight of the bridge and the torque from the twisting becomes to strong for the wind and it starts to move back the other way, or "slip". This time it has a bit of energy stored from the wind and it swings a little farther in the other direction. It oscillates back and forth, each time getting a little boost from the wind. It will automatically vibrate at its resonant frequency, just like the string on a violin will. And it only depends on the speed of the wind and not the way it's "vibrating" just like a violin bow doesn't need to be vibrating, just pushed hard enough. This isn't a case of unknown resonant frequencies getting out of control but rather crappy engineering on the part of the bridge designers -- they just didn't account for that high winds.
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Seuss
Error: divide byzero
Registered: 04/27/01
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Re: Resonant frequencies [Re: daussaulit]
#3881586 - 03/07/05 01:51 PM (17 years, 10 months ago) |
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> to prevent the march's resonant frequency
> The wind blowing over the bridge was vibrating as the same resonant frequency.
bigger
Parasitic oscillation is not the same as resonant frequency.
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PsillyNilly
Stranger
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Re: Resonant frequencies [Re: Seuss]
#3882269 - 03/07/05 08:31 PM (17 years, 10 months ago) |
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The human hearing range is between 20 hz and 20,000 hz but even the average human being cannot reconize high pitched tones above 17k. (This is where good keen ears for audio engineering and mastering comes in). Im sure there are other glands and such in our brain that would be cool to find the resonant frequencies of and play with. Imagine, people gettin addicted to frequencies. I have always wanted to find notes and frequencies that could stiumlate happiness directly and could just steadlily pump them out to the crowd during a show. The Brown note is very real, there is also one that can liquidate your insides. the gov't is supposingly experiementing with these frequencies for weapons but from what I heard, they are very hard to direct. There has been some success and adcnaves in a frequency that is used for RiotCOntrol. It shoots a note down into a general area of people and makes them nautious.
I have a cool story of how elephant's use subsonic frequencies to comminicate but doubt anyone wants to hear it.
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ChuangTzu
starvingphysicist
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 Re: Resonant frequencies [Re: PsillyNilly]
#3882803 - 03/07/05 11:01 PM (17 years, 10 months ago) |
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Tell us about the elephants 
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