New Type of Headphones in 2019

I'm still sticking to my one plus 6 with headphone jack and refuse to upgrade since nearly no new smartphone has it vat tax calculator this days. Its so disgusting.

I heard about this technology 10-15 years ago. A transducer generates a very high frequency wave, say, 250K, then a slightly different one like 245K (180 degrees out of phase?). The two signals cancel each other out and the result is a 5k signal that you can hear. Something like that.
BTW, Sony was granted patents 10-15 years ago for a technology to beam sound and video DIRECTLY INTO YOUR BRAIN! How cool is that?

This appears to be a soundbar with a computer-controlled speaker array that tracks the user's location. Nothing said about effective range. Thumbs down!

Now that is very cool!