noun
bleep censor; censoring sound
Refers to the beep or other sound used in broadcasting to mask inappropriate words. The term is self-explanatory from its components: 自主規制 (self-regulation) + 音 (sound).
テレビで不適切な発言があると、自主規制音が入る。
When there is an inappropriate remark on TV, a bleep censor is inserted.
During the live radio broadcast, he accidentally said a prohibited word, and a censoring sound was immediately overlaid.