Armstrong, Edwin Howard

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Armstrong, Edwin Howard,

1890–1954, American engineer and radio inventor, b. New York City, grad. Columbia (E.E. 1913). He was associated in research with Michael I. PupinPupin, Michael Idvorsky
, 1858–1935, American physicist and inventor, b. Idvor, Hungary (now in Serbia), grad. Columbia (B.A., 1883). He came to the United States in 1874 and from 1889 was associated with Columbia (as professor of electromechanics, 1901–31).
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 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 modulationmodulation,
in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from the wave
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 (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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