At the transmitter end, a television signal is generated. This signal can come from various sources such as a video camera, a computer, or a video recorder. The signal is then modulated onto a carrier wave, which is a high-frequency wave used to transmit the signal over the air. The modulated signal is then amplified to increase its power and range before being transmitted through an antenna.
The transmitted signal travels through the air as radio waves. These waves can travel long distances, depending on the power of the transmitter and the frequency of the signal. The signal can be received by a television antenna, which is a device designed to capture the radio waves and convert them back into an electrical signal.
At the receiver end, the electrical signal is demodulated, which means the original television signal is extracted from the carrier wave. This signal is then sent to the television set, where it is displayed on the screen. The quality of the received signal can be affected by various factors such as distance from the transmitter, interference from other signals, and atmospheric conditions.
Sjónvarpssamskipti has evolved significantly over the years, with the introduction of digital television (DTV) being a major advancement. DTV uses digital compression to reduce the bandwidth required for transmission, allowing for higher quality images and more channels. It also provides features such as high-definition television (HDTV) and interactive services.
In recent years, there has been a shift towards internet protocol television (IPTV), which transmits television signals over the internet. IPTV offers features such as on-demand content, interactive services, and the ability to watch television on multiple devices. However, it requires a stable internet connection and a set-top box or smart TV to receive the signals.