174Views21Replies

Author Options:

Is my hearing wacky? Answered

I was just using a tone generator and I chose a sweep mode. I can here 2.1mhz, but when I did a sweep down to 100Hz there was a long pause when I couldn't here anything, and then I can here it. Is this normal?

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
guyfrom7up
guyfrom7up

13 years ago

well, it might just be a glitch in the software I'm using because I can here 2.1mhz, 2.0 mhz, 2.5, 2.3, but not 2.4mhz. Is it just a certain pitch that my ear can't here or might it me a glitch with the soft ware? I use NCH tone genrator

0
gmoon
gmoon

Reply 13 years ago

AFAIK, you should not be able to hear any of those frequencies (not even 100k.) You must be hearing some other artifact of the process (undertone harmonic?)

It's no wonder the effects are inconsistent on your hearing. I wouldn't sweat it....

0
Patrik
Patrik

Reply 13 years ago

Yeah, there is no way you are actually hearing a mHz-range frequency.

What you might be hearing is some overtones (or in this case, undertones) of that frequency (seems unlikely, considering this is about 7 octaves above the audible range), or perhaps some other artifacts caused by cross-talk in your audio system. For example, if your CPU frequency is a multiple of the frequency produced by the tone generator, it is possible you might hear a faint tone which is the beat frequency between an overtone of the tone generator and the CPU frequency.

Either way, what you're hearing is just an artefact of having a less-than-perfect audio system, and any "gap" in your hearing between 20kHz and 2mHz is entirely accidental.

Try scanning 100Hz - 20kHz. If there's any gaps there, I would start worrying...

As an aside - I can hear a very high-pitched whine coming from many TV sets. Can be quite annoying, but most people just don't hear it. This high-pitched whistle presumable corresponds to the line refresh rate of the TV set: 525 lines per TV screen, 30 times per second = 15.7kHz, which is at the extreme end of most people's audible spectrum. Guess I just happen to be more sensitive in that frequency range than others...

0
KeannaRoar
KeannaRoar

Reply 13 years ago

Wow. You can hear the TV left on too? Everyone in my family thought I was nuts.

0
its a lion
its a lion

Reply 13 years ago

i can hear that too. our downstairs fan has a real high pitched whine that drives me crazy, but nobody else in my house can hear it...

0
w00ty32
w00ty32

Reply 13 years ago

I hear that whine from some TV's 2, so ur not crzy if u were wondering

0
Patrik
Patrik

Reply 13 years ago

Oh, I know I'm not crazy. The green people living behind the wallpaper told me so...

0
gmoon
gmoon

Reply 13 years ago

Oh, man. The green wallpaper people are much harder to get rid of than, say, that 60 hz hum...

0
Sunbanks
Sunbanks

Reply 13 years ago

What are you trying to do with it anyway?

0
guyfrom7up
guyfrom7up

Reply 13 years ago

it's a secret, I'm going to make an instructable about it later. If you really want to know it PM me and I'll tell you if you don't tell anyone else ;) For other people it's not a huge deal, just a cool little trick that can be made for a couple of dollars.

0
Goodhart
Goodhart

Reply 13 years ago

This excludes the "voices in my head" of course

0
Garth Knight
Garth Knight

13 years ago

No, this is not normal. But it is probably still a small tumor... It's been nice knowing you.

0
guyfrom7up
guyfrom7up

Reply 13 years ago

You're joking, right lol?

0
Garth Knight
Garth Knight

Reply 13 years ago

Well... it HAS been nice knowing you, Oh- You meant about the tumor. yes joking. yep. I would'nt sechdule a hearing monday am.

0
Sunbanks
Sunbanks

Reply 13 years ago

I'm sure he is just joking. Maybe you listen to music too loudly.

0
Sunbanks
Sunbanks

Reply 13 years ago

Ok I really have no idea if that's why you can't hear it.

0
its a lion
its a lion

Reply 13 years ago

it might be a good guess though. if i were you, i would get a few people to try it out if you can. if the pause happens for all of them, it may be a natural occurence, or a glitch in the software... i honestly have no idea...

0
NachoMahma
NachoMahma

13 years ago

. The range of human hearing is approximately 20-20KHz, so if you can hear a 2.1MHz signal then it is not normal. Even Superman can't hear freqs that high. . Probably something wrong with your tone generator and it has a high harmonic content.

0
trebuchet03
trebuchet03

13 years ago

At least you don't have a constant ringing in your ears ;)

0
VIRON
VIRON

13 years ago

If you really mean 2.1 MHZ, your software is glitchy. You can't hear that frequency without a short-wave radio.