The IEEE Communications Magazine has a monthly series History of Communications
edited by Mischa Schwartz, professor emeritus of electrical engineering at
Columbia University. This month's issue is on Edwin Armstrong's
Invention of Noise-Suppressing FM. Armstrong is credited as the inventor of
wide-band FM and was awarded a patent for his invention on December 26, 1933.
That and other interesting information can be found in the four page article
which is available at
http://www.comsoc.org/livepubs/ci1/public/2009/apr/pdf/cihistory.pdf
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