Your phone has a small chip called DSP, wich is always translating your voice into data. It has a “special mode” where it uses almost no battery but can still understand the “Hey Siri” hotword and wake up the phone.
It’s like when your dog is sleeping next to you and you say something. It will listen, but won’t react unless you call your dog’s name.
So the disconnect is when people say listening they actually mean two separate processes, there’s hearing the sounds and then theirs recording and storing what is said. The analogy is like sleeping, when ur fast asleep you are still listening, we know this cus if I call ur name loud enough you will probably wake up. But that doesn’t mean when ur fast alseep u can remember what is being said, cus ur listening without storing the information. Same thing with Siri it’s listening constantly but doesn’t wake up and record what you have said until you say hey siri.
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