Back in the 1980s, there was the Sony Walkman TPS-L2 and then TV Guardian, a nifty gadget designed to censor profanity. How does it work? This device uses close captioning through line 21 in the analog video signal to spot foul language, and then it mutes the audio.
After decoding the close captioning data from line 21, it searches for a match in its dictionary before muting the audio. It then replaces that language with close captioning, but one thing it can’t change is the what is being show on-screen. For those interested, there are modern versions of the TV Guardian compatible with smart devices as well as DISH Network satellite programming. Unfortunately, you’ll have to scour eBay to find this vintage model.
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