Singapore surround

Travellers on Singapore Airlines flights can now listen to movie soundtracks
in full surround sound, using a new technology from Dolby that creates the audio
effect of a cinema sound system. The Dolby Headphone system uses ordinary stereo
headphones but creates five-channel surround sound by leaking sound from the
left to the right channel and changing the phase of the leaked signals. This
phase change mimics the audio cues we use to perceive the direction from which
sound is coming.