> In general, human speech is jammed by giving back to the speakers their own utterances at a delay of a few hundred milliseconds

That’s what I seemed to remember also.

I think 2 seconds like in the OP link is too long delay to work as actual jamming.

version 2.0 - why not both? one for noise-cancelling, one for social-cancelling.

Similar, but OP is about making people socially conscious of the noise they're producing (not through speech), while this "jamming" technique actually (at least theoretically) interferes with the cognitive process of choosing and forming words.

Years ago, I wanted to build this exact concept into a smartphone so I could just toggle it on whenever I needed to end an interminably long phone conversation.

It’s basically the “Chinese food” Seinfeld gag.

See also:

https://improbable.com/2021/09/03/2012-japanese-ig-nobel-pri...