Have some of this in Sprint specs we can look up. The items on screen are read out. Mostly for accessibly but can be used by sighted users, and i f good, coin be very useful. Think about GPS directions, and how much its become a joke. Make it better! Alison's phone announces (badly!) callers with a text-to-voice. Use that as a good sample where it sorta crosses with reminders (it's a notification, with privacy etc. issues) as well as on onscreen readout, but also as an anti-pattern since it launches into it, and is un-understandable).
Basically, TTS (text to speech)
Fair bit about it being the output side of voice input, so together it's a voice control system
Problem
Solution
Variations
Universal - whole interface, output side (replacing the screen) for a complete voice I/O.
Elemental - Read a document, a web page, etc. Then ends.
Selected - Read a selection
Confirmation - In a voice I/O, reads back entry to confirm that this is what is intended.
Interaction Details
Presentation Details
Antipatterns