Deep learning turns mono recordings into immersive sound

The brain uses a variety of clues to work out where a sound is coming from in 3D space. One important clue is the difference between a sound's arrival times at each ear--the interaural time difference. A sound produced on your left will obviously arrive at your left ear before the right. And although you are not conscious of this difference, the brain uses it to determine where the sound has come from. Another clue is the difference in volume.