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-   -   extremely high frequency hiss sound? (http://www.diyaudio.com/forums/everything-else/222945-extremely-high-frequency-hiss-sound.html)

realflow100 5th November 2012 07:01 PM

extremely high frequency hiss sound?
 
so for a few years i've had no problem with my hearing at all.. can hear all sounds just fine. and no sensitivity problems.
but i've always heard an extremely faint soft but absurdly high frequency hiss or tone in my ears when i'm in a very quiet room and not doing anything else.
is this normal? or is there some interference with my hearing/ears?
I'm not sure where to put this so i put it in the everything else section of the forums.

Cal Weldon 5th November 2012 07:14 PM

Tinnitus.

6speed 5th November 2012 07:19 PM

I think it's normal, but I'm not a doctor. It depends on how loud it is, if you look up "tinnitus" there's a lot of info out there on the subject. I have noticed this for myself my whole life so I guess that's why I said I think it's normal. I tend to have sensitive hearing though and I notice it mostly when I have too much coffee.

kevinahcc20 5th November 2012 08:13 PM

Everyone has a high frequency background noise in their hearing apparatus. For most people without clinical tinnitus the noise is so faint to be inaudible unless they are in a VERY quiet environment where the noise is above the background level. When I was in my early 20's I had no symptoms of tinnitus but I was able to hear this background noise in an anechoic chamber after 15 or so minutes in the dead quiet.

If you have tinnitus this noise is elevated such that it is audible...in mild cases you hear it when it is quiet, like at night in bed. More severe cases make it audible at higher levels of background sound. So if you only notice it in very quiet circumstances you may be normal, or it may be an early sign of tinnitus.

freax 5th November 2012 08:19 PM

do you by any chance have high sensitivity speakers running parallel to cables which may or may not be carrying digital information? it could be anything, vga or hdmi cables in the walls, ethernet running alongside speaker cable...

high frequency hiss in an audio system is usually a sign of digital making its way through to the analog side.

Does the pattern of the noise change?

As others have said, it could be your hearing, but I'm going to take a different approach and say you've already marked that off as a possibility.

realflow100 6th November 2012 12:54 AM

it isn't anything to do speaker cables or wires.... the noise is from inside my head.
it usually only happens when it's super quiet or when i'm lying in bed on a quiet night.
its not a ringing tone but more of a hissing sound or extremely faint white noise at a ultra high frequency. but even when i'm in bed at night with no sounds around me it's still hard to hear..
but sometimes i can hear it if i listen for it carefully.. and from what i can hear it sounds like it's far above 20khz and it's constant and doesn't change.
it's super super mega high frequency but very faint..... and i usually do hear it when im in a completely silent room like in my bedroom about to go to sleep.
sometimes it sounds almost like radio static. but there's no voices or changing tones or anything weird like that...
just plain static at a extremely high frequency.. (far greater frequency than what the ringing sound would normally be if i had a ringing in my ears)
and sometimes I hear a completely out of phase low frequency rumbling pressure wave through my head and ears when a car drives by on the highway (pretty far away) which feels absurdly odd if you ask me.. although i'm not really concerned about it that much..
and again... the frequency is always constant and never changes but it's never noticed unless i'm in a completely totally silent room usually at night.

6speed 6th November 2012 01:02 AM

Well if you cover your head with aluminum foil and it goes away then you maybe in trouble, but otherwise I think your fine / completely normal. :p

sreten 6th November 2012 01:06 AM

Hi,

This is just boring tosh from a youngster who is incapable of describing
anything accurately, and knows what "far above" 20KHz sounds like.

Give me a break .... (and some empathy with real hearing problems).

rgds, sreten.

kevinahcc20 6th November 2012 02:09 AM

Most people with tinnitus report a high pitched, but certainly not ultrasonic tone. I am at a loss as to how you place it far above 20kHz...kind of like saying you saw a flash and it looked like a microwave??? Usually it is reported as a simple pitch, kind of monotonic or diatonic. I have bracketed mine with an oscillator and headphones and it mainly seems to be in the neighborhood of about 4.7kHz.

realflow100 6th November 2012 04:39 PM

I do know what 20khz sounds like I've used a program call audacity and set a custom sample rate of 500000 samples per second and then set the 20khz tone to play
it's easily heard as a hissing wizzle sound but not as high as the hissing i'm hearing in my head
I can hear 25khz faintly but it's not much of a tone anymore and is more like a hissing sound sorta of what it sounds like the hissing static in my head but very faint even in a silent room
i'm also autistic i'm sorry if that's whats causing all the problems.


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