system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the "Censor Bleep" tone so consistent across most media?
gpt
Traditionally audio equipment is tested by using a reference tone.  This is just a generated sound wave, usually with a frequency of 1000 Hz, because that seems like a good enough number as any.  Sometimes they'll also play a 100Hz and a 10,000Hz tone to test subwoofers and tweeters, but it's basically an easy way to make sure the volume is adjusted appropriately and all the crossovers are setup right.

Since engineers were already testing with a 1kHz tone, they just kept using it when they had to play something over profanity since it was easy to use it again.

There's no big technical or legal reason to use THAT sound, it was just easy to do and got the job done.