We discuss testing and tuning for accuracy later.
In practice, selecting appropriate phone segments and joining them together is not easy, because the acoustic characteristics of each phone depend on its neighboring phones and the prosody of speech, which often makes the speech units incompatible with each other.
Among these factors are user location, time of day, history of his online searches, and more.
The above list item logically leads to the ease of use of the service.
Step Three: Upload to Kapwing I'm using Kapwing, a free browser-based video editor to add my voiceover to a video.
Siri is able to adapt to each user individually, learning his or her preferences over time.