Inventor Edwin Armstrong demonstrates FM broadcasting to an audience of engineers at the FCC in Washington, DC.

Edwin Howard Armstrong was an American electrical engineer and inventor who developed FM radio and the superheterodyne receiver system.

Frequency modulation (FM) is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In frequency modulation a carrier wave is varied in its instantaneous frequency in proportion to a property, primarily the instantaneous amplitude, of a message signal, such as an audio signal. The technology is used in telecommunications, radio broadcasting, signal processing, and computing.

The Federal Communications Commission (FCC) is an independent agency of the United States government that regulates communications by radio, television, wire, internet, Wi-Fi, satellite, and cable across the United States. The FCC maintains jurisdiction over the areas of broadband access, fair competition, radio frequency use, media responsibility, public safety, and homeland security.

Washington, D.C., officially the District of Columbia and commonly known as simply Washington or D.C., is the capital city and federal district of the United States. The city is on the Potomac River, across from Virginia, and shares land borders with Maryland to its north and east. It was named after George Washington, the first president of the United States. The district is named for Columbia, the female personification of the nation.