How do voice assistants work?

Question

Books

Hello.
I am looking for scientific articles or research on the topic of Voice assistants / assistants. Interested not in popular science works, but in research related to these technologies. Not only the technical point is important to me, but also marketing, psychology (for example, how to choose a voice, etc.) in general, everything that is on this topic.
I turned to Yandex and Google, here I rather hope for people who have been interested in this topic for a long time and can suggest articles or books with a fundamental approach.

Answer 1

In my opinion, in the Microsoft Speech API, the voice was determined by the frequency, speed and duration of pauses between words. Some sets are issued as "Mike", "Michelle".