FM broadcasting

FM broadcasting transmits audio by varying a radio carrier wave’s frequency according to the sound signal. It is widely used for high-fidelity terrestrial radio and is relatively resistant to amplitude noise.

Frequency modulation: A modulation method that encodes information by varying a carrier wave’s instantaneous frequency. FM broadcasting uses this method to encode audio on a radio-frequency carrier.
Edwin Howard Armstrong: An American electrical engineer who developed wideband FM radio and several key radio circuits. Armstrong demonstrated the wideband FM system that shaped modern broadcasting.
Radio broadcasting: The transmission of audio or other information from a station to multiple receivers over radio waves. FM is one method within the broader practice of one-to-many radio transmission.
AM broadcasting: Radio broadcasting that encodes information by varying a carrier wave’s amplitude. AM uses amplitude rather than frequency variation to carry broadcast audio.
FM spectrum: The range of radio frequencies allocated to FM broadcasting in a particular region. Channel assignments within this band determine where stations can transmit.
Armstrong's FM system: The wideband FM broadcasting system developed by Edwin Howard Armstrong in the 1930s. Its broad frequency swings improved sound quality and resistance to static.
FM transmitter: A radio transmitter that encodes a signal through frequency modulation and radiates it from an antenna. Stations use transmitters to send their programs across an assigned FM channel.
Single-sideband modulation: An amplitude-modulation method that transmits one sideband while suppressing the carrier and other sideband. It carries voice using less bandwidth and power than conventional FM broadcasting.
Frequency deviation: The maximum difference between a frequency-modulated signal’s instantaneous frequency and its unmodulated carrier frequency. Deviation sets a key trade-off between audio fidelity and occupied bandwidth.
FM radio in the United States: The development and regulation of FM radio broadcasting in the United States. U.S. policy and station adoption shaped the band and standards used today.

Linked from 12 pages