The AT&T Sound Science Timeline. 1880: Headphones. 1916: The Loudspeaker. 1917: The Microphone. 1925: Electrical Recording. 1926: Sound Motion Pictures. 1927: Negative Feedback. 1928: Sampling Theory. 1926: 33 1/3 RPM. 1929: First Gold Record. 1931: Stereo Recording. 1940s: Vacuum Tubes. 1941: Portable Hearing Aids. 1947: The Transistor. 1957: Computer Music. 1958: Lasers. 1960s: Synthetic Speech. 1962: Communications Satellites. 1990: Audio Compression.

Help/Search. Write to Us. About AT&T. Access.AT&T. For Home. For Business. AT&T Home. AT&T Global Navigation.


Terms and Conditions. Privacy policy.
Copyright © 1999 AT&T. All rights reserved.