When events or programs are transmitted across more than one medium at the exact same time, it is called a simulcast. One example of this would be something broadcasted on television and radio simultaneously. This has been a practice since before TV stereo sound transmission was a possibility, with simulcasting sending sound to TV music broadcasts. Integrated radio-games were a form of simulcasting orchestral scoring with voice-acting into video games.

Simulcasting can also refer to certain programs being shown on different channels in different locations at the same time. When a sports announcer covers a game over the television and radio, this is a form of simulcasting as well. Today, no NBA teams use this form of media, however NFL requires it for all games. Several other types of sports use this for their games in order to ensure a wide range of people can receive access to their programs.

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