Editing Set-top box (section)

===Closed captioning box===
Set-top boxes were also made to enable [[closed captioning]] on older sets in North America, before this became a mandated inclusion in new [[television set]]s. Some have also been produced to mute the [[Sound recording and reproduction|audio]] (or replace it with noise) when [[profanity]] is detected in the captioning, where the offensive word is also blocked. Some also include a [[V-chip]] that allows only programs of some [[television content rating system]]s. A function that limits children's time watching TV or playing [[video game]]s may also be built in, though some work on main electricity rather than the video signal.