Siri and Cortana are AI to some extent. The usual label is "weak AI" (also called "narrow" or "soft" AI). It turns out the Wikipedia article on Weak AI explicitly refers to Siri:
Siri is a good example of narrow intelligence. Siri operates within a limited pre-defined range, there is no genuine intelligence, no self-awareness, ...
Is it because their listening function reloads in milliseconds or even nanoseconds
Yes, it expects the keyword to start every moment of time and it ignores the rest.
Overall, the algorithm is described here, you can read for details:
I would classify both as having / using elements of AI, yes. But I wouldn't say either represents a truly "intelligent" (in the AGI sense) program.
But here's the rub... as you'll see in other questions asking about definitions of AI, there's a sort of memetic thing where anything that AI begins to do successfully, immediately stops being considered "AI". ...
Short Answer, No.
Explained, Siri and Cortana are just inference engines. Though how applaudable their ability to synthesize text from speech and parse lexical maps from the text using Machine Learning Techniques is, the artifact is still just a program, trained with substantial myriad of Q/A tuples, that generates an output given an input. Statistically ...
They are virtual artificial agents which exhibit intelligent behavior (AI).
Tim Urban on Wait But Why website wrote the following:
The software and data behind Siri is AI, the woman’s voice we hear is a personification of that AI, and there’s no robot involved at all.
Source: The AI Revolution: The Road to Superintelligence
Related: What is the ...