Audio is raw sound. It can sound musical or be a noise. When sound is used for communication using a vocabulary of a language it is 'speech'. Speech is a mode of communication for Humans. While computers can communicate well with exchanges of structured data. How do we go from there to here is the Question.

"Humanity has only scratched the surface of its real potential." - Peace Pilgrim

"We are very, very small, but we are profoundly capable of very, very big things." - Stephen Hawking