Sonic Siri

A Chinese research firm has discovered that all our our various voice assistants (Alexa, Siri, OK Google and Cortana) listen to frequencies well beyond the range of human hearing.  Therefore, if a malicious command is pitch-shifted above that range, our devices will hear it and execute it without any of us knowing about it.

Here's the video of it in action:



On the surface, this looks a bit scary: the parts are cheap, there are apps that will shift the frequency of any input (though it may need to be washed through the app a few times, but that's not hard, just time consuming).  And maybe it is scary, but there are some things that you can do about it.  Read on.