Gottfried Ungerbock, Austrian engineer

Gottfried Ungerbock, Austrian engineer

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Credit: IBM RESEARCH/SCIENCE PHOTO LIBRARY

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Caption: Gottfried Ungerbock (born 1940), Austrian communications engineer. Ungerbock obtained his doctorate from the Swiss Federal Institute of Technology (ETH Zurich) in 1970. He joined the IBM Zurich Research Laboratory in 1967. He is best known for his invention of trellis coded modulation (TCM), which he described in 1976, with a more detailed account in 1982. This method allows increased efficiency in transmission of information over telephone lines. Ungerbock's honours include IBM Fellow (1984), IEEE Fellow (1985), and the IEEE Richard W. Hamming Medal (1994), the latter for his invention of trellis coded modulation. Photographed in 1979.

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