Analog television or analogue television is the original television technology that uses analog signals to transmit video and audio.
An analog signal is any continuous signal for which the time varying feature of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal.
Television or TV is a telecommunication medium used for transmitting moving images in monochrome, or in color, and in two or three dimensions and sound.
How is digital TV different from analog? by IowaPublicTelevision
In an analog television broadcast, the brightness, colors and sound are represented by rapid variations of either the amplitude, frequency or phase of the signal.
The amplitude of a periodic variable is a measure of its change over a single period.
Frequency is the number of occurrences of a repeating event per unit time.
The End of Analog Broadcast Television: June 12, 2009 by drh4683
Analog signals vary over a continuous range of possible values which means that electronic noise and interference becomes reproduced by the receiver.
So with analog, a moderately weak signal becomes snowy and subject to interference.
In contrast, a moderately weak digital signal and a very strong digital signal transmit equal picture quality.
Analog television may be wireless or can be distributed over a cable network using cable converters.
A cable converter box or television converter box is an electronic tuning device that transposes/converts any of the available channels from a cable television service to an analog RF signal on a single channel, usually VHF channel 3 or 4, or to a different output for digital televisions such as HDMI.
Wireless communication is the transfer of information or power between two or more points that are not connected by an electrical conductor.
All broadcast television systems preceding digital transmission of digital television used analog signals.
Terrestrial television or broadcast television is a type of television broadcasting in which the television signal is transmitted by radio waves from the terrestrial transmitter of a television station to a TV receiver having an antenna.
Digital television is the transmission of audio and video by digitally processed and multiplexed signal, in contrast to the totally analog and channel separated signals used by analog television.
Broadcast television systems are encoding or formatting standards for the transmission and reception of terrestrial television signals.
Analog television around the world has been in the process of shutting down since the late 2000s.