As of 1999 , all newtelevisionsets ( over 13 inches / 33 curium ) sell in the United States have to contain a V - chip . The " V " stands for " violence , " and the destination of the flake is to allow parents to choose the spirit level of violent telly programming that will be give up into the home .
The idea behind a V - chip is simple . TV show have a signal embed in them that gives the show arating , and the chip can detect these ratings . The ratings that the FCC has settled on look like this :
A parent canprogramthe TV with a rating , and the TV willblockall shows above that paygrade . So if a parent program in the tv set - Y7 rating , the tv set will countenance shows rated at TV - Y and TV - Y7 but will block all other shows .
The evaluation are encoded in what is called the " line 21 data area . " If you have learn the articleHow Television Works , then you know about the perpendicular retrace signal . This signal tells the TV to move the negatron beam from the lower right to the upper unexpended nook of the screen . Within this signal are horizontal retrace signals design to keep the horizontal retrace electrical circuit synchronize . The twenty - first line of horizontal retrace embedded within the vertical retrace area has been designated as a data arena that is control by a stock calledXDS . All sort of things go inside this data arena – such as closed captioning information and the time of sidereal day – as well as ratings information .
The V - potato chip simplydecodesthe assembly line 21 datum , comparesit with the parent ’s allowed rating and then either freeze the signal or lets it through . See the next page to learn more .
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