Wiktionary
bleep censor
n. (context computing English) A software module, manually operated by a broadcast technician, putting a five-second broadcast delay on the live content, providing time to censor the audio (and video) feed, and used to censor out what many consider "inappropriate" audio content during a live broadcast signal and replace it with a bleep signal.
Wikipedia
Bleep censor
A bleep censor is the replacement of a profanity or classified information with a beep sound (usually a ) in television and radio.