Editing Radio broadcasting (section)

{{Use mdy dates|date=October 2020}}
{{short description|Transmission by radio waves intended to reach a wide audience}}
{{redirect|Radio station|a broader concept|Radio communication station}}
{{about|audio signals|video signals|Over-the-air television}}
[[Image:Tyholt taarnet.jpg|thumb|upright|Broadcasting tower in [[Trondheim]], Norway]]

'''Radio broadcasting''' is the [[broadcasting]] of [[audio signal|audio]] (sound), sometimes with related [[metadata]], by [[radio wave]]s to [[radio receiver]]s belonging to a public [[audience]].  In '''terrestrial radio broadcasting''' the radio waves are broadcast by a land-based '''radio station''', while in ''[[satellite radio]]'' the radio waves are broadcast by a [[satellite]] in Earth orbit.  To receive the content the listener must have a [[Radio receiver|broadcast radio receiver]] (''radio'').  Stations are often affiliated with a [[radio network]] that provides content in a common [[radio format]], either in [[broadcast syndication]] or [[simulcast]], or both.  The [[code|encoding]] of a radio broadcast depends on whether it uses an [[analog signal|analog]] or [[digital signal]].  Analog radio broadcasts use one of two types of radio wave [[modulation]]:  [[amplitude modulation]] for [[AM radio]], or [[frequency modulation]] for [[FM radio]].  Newer, digital radio stations transmit in several different [[digital audio]] standards, such as DAB ([[Digital Audio Broadcasting]]), [[HD radio]], or DRM ([[Digital Radio Mondiale]]).