Broadcast technology is the equipment and software that put a television channel on air: the cameras' feeds, the control room, the replays, the playout of programmes and ads, and the monitoring that catches mistakes. Watch a cricket match on TV, and a dozen cameras follow the play. A replay appears seconds after a wicket, the score sits in a corner of the screen, and ads run between overs. All of this is controlled from a room that viewers never see.
Here is a typical evening. You are watching an IPL match on TV at home in Lucknow. At the stadium, more than a dozen cameras and many microphones follow the game. Each camera's picture is called a feed. More and more often, these feeds are not cut at the ground. They are sent over fibre-optic networks to a control room in another city. This is called remote production. It replaces the outside-broadcast van, a truck full of equipment that used to be parked at the ground.
In the control room, a broadcast video router receives every feed and sends each one to the people who need it. A director watches a wall of screens and chooses which camera viewers see at each moment. A batter is caught at deep midwicket. Within seconds, an operator on the instant replay system finds the catch on the best camera and plays it in slow motion. Graphics operators add the score and the bowler's figures, using live sports data.
At the end of the over, the channel goes to an ad break. The playout system plays each programme and each ad at exactly the right second, around the clock, often from servers in the cloud. Broadcast monitoring watches the channel as it goes out, and raises an alarm within seconds if the screen goes black or the sound stops. The channel then reaches your home through your cable operator or your DTH (direct-to-home satellite) service. The same match is also streamed to phones by a streaming service.
In the past, the equipment inside a studio was joined by special video cables. Now the signals travel over ordinary computer networks, as described in video over IP. Much of the equipment is becoming software that runs on ordinary servers. AI tools are starting to make replays, highlights and commentary in other languages; see AI-generated content.
Who pays for all of this? The television network that owns the channel earns from the ads shown on it, and from the fees that cable and DTH operators pay to carry its channels. Live sport draws the largest audiences, and so the highest prices for ads, as described in sports media rights. Advertisers pay according to how many people watch, which is counted by audience measurement.