What do you hear above 21Khz?

What do you hear above 21Khz?

  • I can clearly hear the instruments

    Votes: 7 2.6%

  • I hear something but nothing resembling an instrument

    Votes: 41 15.2%

  • I hear nothing

    Votes: 222 82.2%
  • Total voters
    270
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#43
SY said:
It is interesting that Oohashi et al. skimmed right past a huge problem- they could not get the same effect with their loudpeakers and their headphones. Woops. Perhaps that was the reason that they couldn't get a peer-reviewed paper into JAES, just a preprint. They were able to get stuff published in some neurophysiology journals, where presumably the referees were not as familiar with the problems of practical loudspeakers fed with high levels of ultrasonics...

Awfully thin stuff.
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I don't see how it would be possible to get the same effect with headphones as loudspeakers since a great deal of >20kHz soundwaves are conducted through a person's bones, the sternum in particular acting as a diaphragm. Anyone who has sat near a full cymbal crash during an orchestral performance will have experienced this sensation.

John
 
#46
I don't see how it would be possible to get the same effect with headphones as loudspeakers since a great deal of >20kHz soundwaves are conducted through a person's bones
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Airborne ultrasound (as opposed to a coupled transducer)? Do you have a reference on that?

what referees for the JAES would be considered experts in interpreting this data, e.g. who among them would know how to accurately analyze an encephalogram?
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Referees from JAES would know that the headphone observation would have to be sorted out so that, from an acoustics end, you're measuring what you think you're measuring. They just glided by without checking for obvious problems (like in-band IM), and that's not going to fly.

I've never refereed for JAES, but when I've been given papers by APS or ACS, I never hesitated to call on people who had experience with aspects that were beyond what I could accurately judge. I assume that the engineering journals work the same way, but if anyone with direct knowledge knows something to the contrary, I'm all ears.
 
#47
Airborne ultrasound (as opposed to a coupled transducer)? Do you have a reference on that?
Click to expand...

Airborne, yes.

It seems I read it somewhere on the web page linked to earlier in this thread that contained information regarding frequency extension of orchestral instruments. It's been a couple of years, so I may be mistaken about that source. I may also have read about it in any one of a number of texts I have on acoustics, so I'll look there later.

John
 
#52
here is what I get from my preamp - averaged output in the midle of Beatles- Sexy Sadie song. From what I tested, highest frequency was reached by Paul Mauriat orchestra, occasionally signal goes up to 16-18k and rolls off rapidly after that.
There is just no music at 21khz, unless you listen to some electronic synthesizer.
 

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#55
Without reading the paper, what happens inside our brain with ultrasonics?
It (our brain) seems to register (ultrasonic) sound trough our ears even if we know, by measurement, that those ears are limited to say 20, 18, 16 or 14k.
Does brain activity also diminish when perceived frequencies diminish, or is aging only an ear thing? I wonder.
 
#57
I can hear from 21KHz, only thing I used the file at audiocheck.net
When it reaches 13 KHz, it is irritating.
I tried it again but the ear started aching and don't want to try it ever.
Surprising part is I am 50, but I never hear loud music.
I used iMac and a sony Hphone.

Gajanan Phadte
 
#59
Play 18KHz and 19KHz at the same time. Probably shouldn't hear much of either.
Its when the slope of both is in sync every 19th cycle. If your equipment can't
track that slope... You probably will hear them beat against each other at 1KHz.

Its equivalent of an ultrasonic sinewave to "reproduce" such a transient slope
to prevent the problem from happening. These frequencies are relevant, if not
heard directly.
 
#60
In fact we humans can hear much higher up in frequency than we believe, it's just a question how much we have to tune up the volume knob, tried for many years ago with Piezo horn and tone generator.
The feelings is more like a pressure in the ear.

Another funny discovery I made is that we can hear high frequencies through our mouth! 😱
I once worked with a metal grinder and noticed a very high frequency noise became very noticeable when I opened my mouth, it was like sound in the head effect, thought it would have something to do with tensing the jaw muscles or so, so I kept my mouth open and then covered the sound source path from the grinder with my hand at a distance of around 10 cm from my mouth and the noise went noticeably down.

So keep your mouth shut when you listen to your diy/audiophile gears! 😀

Cheers Michael
 
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