Not if it is a sufficiently good AI program.
But until then:
- Sythesized speech is usually cleaner (less noise) than human speech.
- Synthesize speech usually says the same word the same way each time. Human speech seldom does
- Human speech does much more blending -- modification of the initial sounds of a word depending on the sounds at the end of the previous word. Some of this is just smooth movement between sounds being easier than sudden movement, but humans tend to modify the sounds themselves, in ways that you can notice if you really listen but which you might have trouble expressing
- If you can get the voice to say "Merry Mary, marry", and you can clearly understand which word is which, then probably it is AI. If two of the words come out exactly the same, then probably it is AI. If some of the words come out almost but not quite exactly the same and you have trouble saying what the difference is, then the voice might be human. (There are large regional differences in how the words get said, but it takes speech synthesis to make them exactly the same.)
- Try it on homonyms. For example, recently I told Alexa to play one of Elton John's albums, and it said that it was going to play "Live in Australia", with a short i (the verb form, as in, "I live in Canada"), instead of using the long i adverb form, "Filmed in front of a live audience")
