The TV signal

A standard TV camera changes the pictures into an electrical signal called a video signal. The video signal carries the pictures in the form of tiny dots called pixels.

The camera’s microphone changes the sound into another electrical signal, called the audio signal. The video and audio signals together form the TV signal.

A TV signal can reach a TV set in several ways. Local TV stations use antennas to send or broadcast signals through the air as radio waves. Satellites travelling above the Earth can send signals to special TV antennas called satellite dishes.