Beyond 20kHz

[Wombat]

FYI:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4005747/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5285336/

 

[SIY]

Based on these findings, we have called the decrease in Alpha-2 EEG and other related phenomena observed when HFCs of 16–32 kHz are applied the negative hypersonic effect, to distinguish it from what we previously called the hypersonic effect, and what now we call the positive hypersonic effect, as appropriate.

When your research fails to get traction outside of the fringe, double down.

 

[Kal Rubinson]

When your research fails to get traction ...............<insert here>............................................outside of the fringe, double down.

<or corroboration>

 

[Blumlein 88]

Here are a few papers about the use of ultrasound applied to the skull via bone conduction to reduce tinnitus. You'll find even serious researchers have problems coming to a consensus on the matter.

The results in the OP are interesting, but a bit scattered. Further corroboration needs to be done.

https://newatlas.com/tinnitus-cure-treatment-headset/52854/

https://pdfs.semanticscholar.org/8335/162b75fdb20a53f43cc61e41f2fc4c20cf5f.pdf

https://www.uwo.ca/fhs/csd/ebp/reviews/2009-10/Tucker.pdf

https://pdfs.semanticscholar.org/b510/d94c76859e21aebb11d5e561b42d3cebc5fb.pdf

http://www.tinnitusjournal.com/arti...-sound-in-the-audiometricultrasonic-range.pdf

https://www.audiologyonline.com/articles/treatment-tinnitus-using-customized-ultrasonic-18261

 

[Grave]

This is nuts. I personally do not care about inaudible frequencies in my music.

"The discovery of this effect, which was reported for the first time at the 91st Audio Engineering Society convention in 1991 by Oohashi et al., has greatly impacted the audio industry; cutting edge digital audio media, such as the super audio compact disc (SACD), digital versatile disc audio (DVD-Audio), and Blu-ray Disc, allow the recording of inaudible HFCs."

All dead formats. . .

 

[Theo]

Interesting comment in https://pdfs.semanticscholar.org/b510/d94c76859e21aebb11d5e561b42d3cebc5fb.pdf :
"Humans can detect ultrasound up to at least 100 kHz, but perception generally requires direct contact of the source with the body." This would mean that there is "generaly" no ultrasonic perception through air transmission, therefore you most probably cannot "hear" any ultrasonic sound in a stereo speaker system....

 

[Wombat]

Maybe bone-heads have a compensating gift in ultrasonic detection.