November 2003
Vocal Codes
A quirky artificial voice synthesizer built in the 1930s paved the way for cell phones.
By Lisa Scanlon
Every time you make a digital cell-phone call, you take advantage of speech coding-the process of converting human speech into a simpler signal that can be transmitted more quickly. This technology has its roots in a quirky organlike electrical speech synthesizer invented nearly 70 years ago by an AT&T researcher.
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Massachusetts Institute of Technology