I used to meditate sometimes... lot of times in a quet room, when there`s no noise at all, there`s this "yiinngg" non stop noise...

it happened when i entered a sound proof room in a R&D centre...........

if there`s no movement of air to cause the air molecule to vibrate and trigger what we called sound, then that it that i am hearing??

anyone heard that before??

It called tinnitus.

oohh....

is it possible for human ear to detect 0dB??

is tinnitus normal phenomenon or disease??

This post has been edited by Awakened_Angel: Oct 1 2009, 10:27 AM

My hypothesis,

Our ear take in a lot of different sound everyday.
It is logical to assume there exists some form of pre-processing to filter out unwanted i.e. ambient/background sound in order to have greater clarity on the information that we actually need.

But when you entered a noise proof room, your normal noise filtering mechanism over compensated and resulted in the perception of noise instead. If this is true, you would need some time of staying and living in the same noiseless room until your system readjust itself.

IINM
0db means no gain no loss in amplitude of sound, or how long the sound wave can be sustained (from how far still can hear), not no sound at all,

i think TS meant something like detecting below 20Hz, the range of human hearing?

i'm getting confused here

This post has been edited by ngwinnie: Oct 1 2009, 02:06 PM

no... its not frequency...

what if the magnitude of sound is low.. say 2 or 5 within our hearing frequency.. can we detect it?

I think TS meant the Sound Pressure. See here ->Examples of Sound Pressure Levels

dB always has a reference value, just often this reference level is implied and thus not stated.
In this case 0dB is the human auditory threshold in air.

Tinnitus is a symptom so it may be permanent or temporary depending on the cause.

Is it possible to hear total silence? Probably not since the body itself is not perfectly silent with blood gushing everywhere throughout the body and the beating of the heart.

can we hear our heart beat and our blood flow??

is that even possible??

yes.... doctor did it everyday with stetescope

i think when he meditate, he must have been in hot room which cause his body under pressure...

nolaa.... stetescope is the device doctor use to listen to patient heart beart one

Human's ears can detect sounds of a range of dB. If i not mistaken, the minimum is 20dB.
Dog's somewhat more sensitive, minimum is 15dB.

While it's not possible for human's ear to detect 0dB sounds, I think it can be amplified to make it audible.
After all, 0dB is sound equivalent to 1W.

P(dB) = 10 log P(Watt)

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Added on October 5, 2009, 1:18 amEi was it?

my oh my... i've remembered wrongly then. Pardon me DX

This post has been edited by ~lynn~: Oct 5 2009, 01:18 AM

Noise, it's in all systems. What you describe is when a measuring device (ears in your case) has reached it so-called "noise-floor", a minimal point where the internal noise of a system has overtaken the external sense/input/stimuli levels.

Inherently all systems generate noise. Try closing your eyes when you sleep, sometimes you can "see" little color streaks, or if you hear a surprising sound you realize your vision flashes white even when your eyes weren't open. The reason we dream is theorized as the brain's inability to interpret a lack of stimuli, so the brain starts making assumptions due to a lack of input, and that can be called noise in a way too.

But hell, i'm an electrical engineer, not an neurological theory.

HEY! That happened to me!
Oh.. So that is why it happens eh?

Thanks! Very enlightening

yes.. it happened to me too.. sometime when I close my eye, seems like I could see image.. but looked closer, it is nothing more than chaos

If I'm not mistaken, that sound that you hear when you go into the Anechoic Chamber is tinnitus.

I haven't come across any medical explanations on the actual cause of the noise, so for now I take the view that it's your brain imagining up sounds when there's really no input at all.

the main problem of modern science... when science cant explain or detect a thing, science will deem it as paranormal, supernatural, impossible, irrelevent, imagination etc.... but never tyr to solve it...

it's definitely tinnitus.

i have it to quite a strong degree that it affects my sleep. which is why i always read before i go to sleep, and only sleep when i get really tired.

there are several causes to tinnitus, it could be environmental, it could be infection, it could be a defect, and it could be psychological. cures depend on which cause u have. the environmental and infection is easiest to solve. there's a device that could project the exact opposite of the ringing sound, effectively negating the sound altogether. which is not what i have, unfortunately.