Cetera Audio Positioning Algorithm
The Cetera Algorithm is a sound algorithm that faithfully reproduces 3D positioning with stereo earphones or headphones. Although originally designed for use with hearing aids, if you have some earphones handy, you can hear some sample audio tracks (the barbershop one is great). The 3D positioning is pinpoint sharp and pretty startling. It doesn’t seem to be able to locate sounds in front of you though.
“Current hearing aids are miniature PA systems. They mainly amplify sound,” said Jerry Ruzicka, president, Starkey Labs. “However, while making sound louder, because of their physical presence in the ear canal, they obscure the clues needed by the brain to process sound. The results is that most hearing aids aren’t able to give the brain the data it needs to filter out background noise, to locate where the sound is coming from or to favor one voice over another in a crowded room.”
The algorithm is not new, but this is the first I’ve heard of it. I feel like getting a haircut now.
4:35pm 
I’m curious whether the algorithm is proprietary or under some free license? I would be glad to try it, since I’m a professional programmer and also play music. But I deal with open source platform and so that would only work if the algo is under GPL or so… Where I could find more info about it?
Not sure about how you’d go about trialling it, but I’m pretty sure it’s proprietary.