section_path: Applications/Broadcasting/Audio: Radio broadcasting
section_name: Audio: Radio broadcasting
paragraph_text: Audio: Radio broadcasting
  
  Radio broadcasting means transmission of audio (sound) to radio receivers belonging to a public audience. Analog audio is the earliest form of radio broadcast. AM broadcasting began around 1920. FM broadcasting was introduced in the late 1930s with improved fidelity. A broadcast radio receiver is called a radio. Most radios can receive both AM and FM.