I'm amazed to learn that there are voice codecs that function at 700 bits/second! https://www.rowetel.com/?page_id=452
The target use case is amateur radio but I'm sure there's a range of useful applications.
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I'm taking an amateur radio exam today and reviewing mock papers.
I'm struck that they explicitly teach people to ignore trolling! This is the first time I've heard official advice on dealing with troll behaviour. (The expected answer is D in both cases here.)
I've been learning about the fascinating hobby of amateur radio: https://youtu.be/ysOq6ywTSzU
It reminds me of chat roulette, except all the users have a license and many of them build their own equipment!