An image source. This is the electrical signal representing the visual image, and may be from a camera in the case of live images, a video tape recorder for playback of recorded images, or a film chain-telecine-flying spot scanner for transmission of motion pictures (films).
A sound source. This is an electrical signal from a microphone or from the audio output of a video tape recorder or motion picture film scanner.
A transmitter, which generates radio signals (radio waves) and encodes them with picture and sound information.
An antenna coupled to the output of the transmitter for broadcasting the encoded signals.
An antenna to receive the broadcast signals.
A receiver (also called a tuner), which decodes the picture and sound information from the broadcast signals, and whose input is coupled to the antenna.
A display device, which turns the electrical signals into visual images.
An audio amplifier and loudspeaker, which turns electrical signals into sound waves (speech, music, and other sounds) to accompany the images.