Part 3/10:
The TV Guardian operates through a seemingly straightforward mechanism: it decodes closed captioning data embedded within the TV signal. This closed captioning is transmitted within the analog video stream, utilizing something known as Line 21. By extracting the closed captioning data, the TV Guardian compares it against a pre-programmed dictionary of offensive terms. If it finds a match, it promptly mutes the audio in order to “protect the innocent,” allowing children to watch films without hearing adult language.