| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Armstrong, Edwin Howard |
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| 1890–1954, American engineer and radio inventor, b. New York City, grad. Columbia (E.E. 1913). He was associated in research with Michael I. Pupin at Columbia and became professor there in 1934. Armstrong received numerous awards for his contributions to the development of radio, which include the invention of the regenerative circuit (1912); the superheterodyne circuit (1918), the basic circuit of nearly all modern radio receivers; the superregenerative circuit (1920); and wideband frequency modulation (FM) system (1925–33). In 1947 he received the Medal of Merit for his contributions to military communications during World War II. |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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