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by robterrell 3746 days ago
Siri is definitely not trained to a single voice. And yes, the car radio can turn it on. I've had a podcast discussion of Siri trigger it. It became such a joke that some podcasters have another phrase they say when they mean "hey Siri".
3 comments

Since the iPhone 6S, Hey Siri is activated by a dedicated chip in the SoC. This enables low-power real-time detection of trigger words. Before, Hey Siri only worked with phones in the process of charging, because it was done with software, so a lot less efficient.

These voice-activated chips can be trained (as seen in a lot of other phones), but I'm not sure the software-powered Siri can be trained.

"Trained" is a bit of a joke with voice-activation. I've never seen it matter in practice.
Doesn't "trained" in the context of voice recognition mean something more like "better able to understand your voice" and not "able to exclude other voices."
I think Google does for android. I often ask "wake me up in 15 minutes". I've seen the phone write 50 and immediately switch to 15.
trained to a particular voice ~= trained to a user's preferences!
As a sample of the alternate term, Merlin Mann's assorted podcasts generally use "Ahoy Telephone."