Strange Electronic Noise on Fox Continues, Now on Fringe

Usually heard on Fox Sports programming, I am now hearing it on tonight's episode of Fringe (on, you guessed it, Fox). To repeat: It sounds like a faint 1990s cell phone ringtone. It lasts about 2 or 3 seconds, and just keeps repeating every few seconds. Someone described it as "a cyclic, tone-repeating sequence." I have seriously (vaguely) considered giving up watching TV. Or at least shows on Fox. Can't quite figure this all out, but not liking it.