I've never heard of white-noise back-up alarms before so I googled and found this comprehensive ad on YouTube that even shows how your brain reacts to what they also call "broadband sound." Other than being a less-annoying sound, the broadband sound is also more directional than a beeper. So people in jeopardy will hear the sound the loudest, whereas back-up beepers sound just as loud to people not in the path of the vehicle backing up.For my Kodiak, Washington may require me to update my backup beeper to a white-noise emitter... we'll see. (I may do this before I am required to because I hate the beep)
I wonder if broadband sound will find its way into EV pedestrian warning applications? I like the continuous electronic sound of my two electrified vehicles more than I would like the on/off pulsing broadband sound, but it makes a lot of sense for back-up alerting.