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Internet radio

Digital audio service transmitted via the Internet

  • 14 min read
  • 5 chapters

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Through Internet, Wireless and Smartphone

Internet radio involves streaming media, presenting listeners with a continuous stream of audio that typically cannot be paused or replayed, much like traditional broadcast media; in this respect, it is distinct from on-demand file serving. Internet radio is also distinct from podcasting, which involves downloading rather than streaming.

Internet radio services offer news, sports, talk, and various genres of music—every format that is available on traditional broadcast radio stations. Many Internet radio services are associated with a corresponding traditional (terrestrial) radio station or radio network, although low start-up and ongoing costs have allowed a substantial proliferation of independent Internet-only radio stations.

The first Internet radio service was launched in 1993. As of 2017, the most popular Internet radio platforms and applications in the world include TuneIn Radio, iHeartRadio, and SiriusXM. In the U.S., unlike over-the-air broadcast radio, an FCC license is not required to operate an Internet radio service.

Internet radio technology

Internet radio services are usually accessible from anywhere in the world with a suitable internet connection available; one could, for example, listen to an Australian station from Europe and America. This has made internet radio particularly suited to and popular among expatriate listeners. Nevertheless, some major networks like TuneIn Radio, Audacy, Pandora Radio, iHeartRadio and Citadel Broadcasting (except for news/talk and sports stations) in the United States, and Chrysalis in the United Kingdom, restrict listening to in-country due to music licensing and advertising issues.

Internet radio is also suited to listeners with special interests, allowing users to pick from a multitude of different stations and genres less commonly represented on traditional radio.

Listening

Internet radio is typically listened to on a standard home PC or similar device, through an embedded player program located on the respective station's website or on a smartphone app. In recent years, dedicated devices that resemble and offer the listener a similar experience to a traditional radio receiver have arrived on the market.

Streaming

Streaming technology is used to distribute Internet radio, typically using a lossy audio codec. Streaming audio formats include MP3, AAC+, Ogg Opus, Ogg Vorbis, Windows Media Audio, RealAudio. Audio data is continuously transmitted serially (streamed) over the local network or internet in TCP or UDP packets, then reassembled at the receiver and played a second or two later. The delay is called lag, and is introduced at several stages of digital audio broadcasting.

Simulation

A local tuner simulation program includes all the online radios that can also be heard in the air in the city.

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