
According to an article at Wikipedia that doesn't cite and references or sources, the TV bleep censor--the tone played over an increasingly small list of curse words when they're uttered on TV--is generally a 1000 Hz tone. That would put it just flat of a B4.
Let's take an episode of South Park, the very first episode actually ("Cartman Gets an Anal Probe"), then select a few lines with lots of bleeped expletives (the scene where Kyle cusses out the aliens) and see if the bleep tone is near a B.
Nope, in this case it's just flat of a C5.
