GENERAL KNOWLEDGE

Detailed explanation-1: -Edwin Howard Armstrong (December 18, 1890 – February 1, 1954) was an American electrical engineer and inventor, who developed FM (frequency modulation) radio and the superheterodyne receiver system.

Detailed explanation-2: -In 1918, he invented the superheterodyne circuit, a highly selective means of receiving, converting, and greatly amplifying very weak, high frequency electromagnetic waves. His crowning achievement (1933) was the invention of wide-band frequency modulation, now known as FM radio.

Detailed explanation-3: -, FM radio, which delivered clearer sound, free of static. Armstrong received a patent on wideband FM on December 26, 1933. from May 1934 until October 1935.

Detailed explanation-4: -During his third year at Columbia, Armstrong came up with his first major invention: the first radio amplifier. He had learned how Lee DeForest’s radio tube worked; then he redesigned it by taking the electromagnetic waves that came from a radio transmission and repeatedly feeding the signal back through the tube.