supposed hearing limit of 20khz is b.s., just saying

[rifftrax]

'Mway, yeah... If you put it right next to my ear and set it to 116dB I can vaguely sense something's coming out of it. But I certainly can tell weather it's switched on or off!'

Now thats not my definition of "no problem hearing 25kHz".

Did I mention that it is EXTREMELY LOUD and uncomfortable? OK. My bad I apparently left that out. I can't hold it pointed towards my ear with that volume level for more than a few seconds @ 25khz.

So, yeah - that actually IS my definition of hearing 25khz with no problem at 116db. You guys keep trying to poke holes in my 'argument' here and I can keep dismantling them. You think I would post about this if I wasn't reaaaally convinced I had an iron-clad argument? Hell no.

[UltraJv]

Another side to this which has comeup in another thread is hearing damage. Its easy enough to do this within the standard audio spectrum, I bet high power ultrasonics wont help.

[Kriminal]

[BertKoor]

Did I mention that it is EXTREMELY LOUD and uncomfortable?

No, you did not.

Please make that perceivability threshold plot I asked for, ok?

[spaceman]

Did I mention that it is EXTREMELY LOUD and uncomfortable?

No, you did not.

Please make that perceivability threshold plot I asked for, ok?

Quite conclusive I'd say

[UltraJv]

Did I mention that it is EXTREMELY LOUD and uncomfortable?

No, you did not.

Please make that perceivability threshold plot I asked for, ok?

Another side to this which has comeup in another thread is hearing damage. Its easy enough to do this within the standard audio spectrum, I bet high power ultrasonics wont help.

[pough]

I actually know how to use the equipment at my test bench though.

well, that definitely proves that no scientist who ever measured human hearing response knew what they were doing, then.

I've been waiting for this moment, the moment when whyterabbyt takes on himself, but to be honest I didn't think I'd ever actually see it.

[Meffy]

You guys keep trying to poke holes in my 'argument' here and I can keep dismantling them.

The problem is that your argument is like trying to disprove that no human can possibly lift 168 kg, as if any such claim had been made. As far as I know, no reputable scientific authority has ever claimed that human hearing has an absolute, hard limit of exactly 20 kHz. It's a straw man to say otherwise.

Proving that a straw man is BS... well, I don't see any point to that approach. And it's still not a certainty that you are able to hear 25.1 kHz rather than its subharmonic, though it is possible.

[pough]

Pretty much everyone in my office can hear the 116db 25.1khz tone emitted by a particular transducer I've done the most testing with. Serious. I shit you not. This includes a 33 year old chick and people up to around 40.

For the first time ever I'm glad to be 40. I do not want to hear a 116db 25.1kHz tone.

[whyterabbyt]

I actually know how to use the equipment at my test bench though.

well, that definitely proves that no scientist who ever measured human hearing response knew what they were doing, then.

I've been waiting for this moment, the moment when whyterabbyt takes on himself, but to be honest I didn't think I'd ever actually see it.

i think you actually got a moment where cut-and-paste of quotes introduced a mis-attribution. thanks for letting me know.

[spaceman]

The proof pretty much comes down to taking people's word for it that they heard something and that it wasn't sub-harmonics.

[IncarnateX]

Who gives a friggin flying f.u.c.k about hearing frequencies beyond 25 khz? Does this make my music sound more analog? To me it sounds like the kind of frequencies that would get to my nerves.

[trimph1]

Is this another anti-aliasing thread?

I don't know, any audiologist that I talked with told me that there were always people who could hear that sort of frequency (>=21kHz), especially when younger than 25 yr old. I worked around all kinds of stuff that would try my hearing..things with flyback transformers and the like. And, of course, if you are going to be playing around at that db range...well...of course things are going to be kind of rough.

[JasonSpatola]

As far as I know, no reputable scientific authority has ever claimed that human hearing has an absolute, hard limit of exactly 20 kHz. It's a straw man to say otherwise.

+648646545248798765437

I thought the thread title was sarcasm at first, as this is no revelation.

[kritikon]

Not that I rate Wikipedia as the font of all knowledge, because obviously any eejit can post any shite they want on it, but often it gives a decent idea of a subject. I suspect the OP is maybe mistaking the idea of"threshold of hearing" with "can't hear". Medically, hearing is tested at set volumes. For an audiologist to say you can't hear above X Hz doesn't actually mean you can't hear anything above X Hz, it means that at a useful volume you can't hear anything useful. Completely different from you saying the medical world says nobody can hear above 20 kHz - because they never said that. I rather think you inferred that of your own volition.

Absolute threshold of hearing
From Wikipedia, the free encyclopedia

The absolute threshold of hearing (ATH) is the minimum sound level of a pure tone that an average ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the organism.[1][2] The absolute threshold is not a discrete point, and is therefore classed as the point at which a response is elicited a specified percentage of the time.[1] This is also known as the auditory threshold.

The threshold of hearing is generally reported as the RMS sound pressure of 20 µPa (micropascals) = 2×10−5 pascal (Pa). It is approximately the quietest sound a young human with undamaged hearing can detect at 1,000 Hz.[3] The threshold of hearing is frequency dependent and it has been shown that the ear's sensitivity is best at frequencies between 1 kHz and 5 kHz.[3]

http://en.wikipedia.org/wiki/Absolute_t ... of_hearing

I think you finally mentioned that 116dB is pretty loud. For 25 kHz it's fuckin loud. So basically, at normal hearing levels in a normal environment probably very very few people can actually hear 25 kHz as the medcial world accept. But not you apparently...you can hear that tone from across the room at normal volume levels can you?

Most of the time I can't hear much above 16 or 17kHz (probably less nowadays). But it's entirely possible if blast your sound thingummy in my earhole that I might feel it as pain or something - possibly even not hear it at all. I suspect if you detonate a grenade inside my earhole I might even hear below 20Hz briefly. No bleedin' use to me though, and I doubt the medical world would call that useful hearing...