Here’s a quick project I had the idea for after reading that the “swear bleep” sound is actually fairly standardized at 1,000Hz.

Using a Teensy & audio shield, I soldered on a microphone scavenged from the junk drawer. 

With a half an hour’s tinkering, I had the teensy’s FFT monitoring a few frequency bins around 1,000Hz, and firing the output.

If you’re looking for a bleeped out electronics video, there’s really only one choice of channel.

And what better way to show the indicated signal than Mehdi’s most famous feature:

Here’s a vid of it in action:

I wasn’t expecting this bit, but in hindsight there’s no reason why it shouldn’t. When I was replaying the above video, the detector happily triggered again on the 2nd generation audio:

Browception

The Teensy is really a nice platform to make this happen, cheap and very arduino compatible, and there’s a ton of work gone into those audio & FFT libraries. It was a joy to play with.