91色情片

To get convincing 3D sound with a home cinema system you usually have to rig
up rows of loudspeakers. But next month a version of Pearl Harbor will go on
sale on a DVD with a special soundtrack that gives you surround sound on a pair
of cheap stereo headphones. Developed by Dolby Labs in San Francisco and Lake
Technology in Sydney, the soundtrack was produced from the original six-channel
track by mimicking the phase and volume differences recorded by microphones
fixed in the ears of a dummy head.