> 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.

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...