Censored_bleep_sound_effect -

: Bleeping began as a way to scrub content deemed unsuitable for "family" viewing on radio and TV.

: In the early 90s, "bleep techno" emerged as a subgenre in Yorkshire, using machine-generated tones as a primary musical element. Resources for Creators

While the 1 kHz beep is the gold standard, many creators use "thematic" sounds to mask dialogue:

Tracing the Bleep: The History of the "Rave Signal" in Techno music