what was analog tv

Analog television is a television technology that uses analog signals to transmit video and audio. In an analog television broadcast, the brightness, colors, and sound are represented by amplitude, phase, and frequency of an analog signal. Analog signals vary over a continuous range of possible values, which means that electronic noise and interference may be introduced. All broadcast television systems used analog signals before the arrival of digital television (DTV). The transition to digital television has been motivated by the lower bandwidth requirements of compressed digital signals, which allow for better picture quality and more efficient use of the radio spectrum