“OK, Google,” “Alexa,” “Hello Louis.”
Being able to detect these words is actually pretty simple. This technique is called "keyword spotting" and it only needs a few KB of RAM to run on embedded targets.
This is a companion discussion topic for the original entry at https://www.edgeimpulse.com/blog/getting-started-wizard-train-your-first-keyword-spotting-model-in-under-5-minutes