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== Transmission of audio and video signals ==
In [[television]], unlike monophonic radio, at least two signals should be transmitted; [[audio signal|audio]] (AF) and [[video signal|video]] (VF) signals.
Transmitting those signals by means of separate [[transmitters]] and [[Antenna (radio)|antenna systems]] is a very costly solution. Because every stage must be used twice , one for AF and one for VF. Two separate transmitters, a high power combiner and a common antenna system, known as '''split sound''' system, is also quite costly. But if the signals are combined at an earlier stage, number of costly outer stages is reduced.
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