Analog television (or analogue television) encodes television and transports the picture and sound information as an analog signal, that is, by varying the amplitude and/or frequencies of the broadcast signal. Analog television, like all other motion picture systems, exploits the properties of the human eye to create the illusion of moving images. Analog television service is the traditional TV system. Analog television has been the standard broadcast technology since the inception of television using magnetic waves to transmit and display pictures and sound. Analog television has an aspect ratio of 4 by 3, which means the screen is
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