3D: the audio part

摘要

The BBC made the first stereo broadcast as a test in 1925. Stereo sound was further pioneered in the 1930s by teams at Bell Laboratories and, of course, the venerable Alan Blumlein from EMI. While Disney's Fantasia was released with a stereo soundtrack in 1940 (to theatres with monstrously expensive and complex reproduction systems), it took until the late 1950s for stereo to even begin to reach the masses via phonograph discs. Stereo sound provides a left to right horizontal dimension, and with good guality eguipment, a good recording, and a chair exactly in the so-called 'sweet spot' it can sound three dimensional as well.