If you're interested, please read "The Preamble
We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America
" to your computer (here's one: Microsoft Bing Translotor
or MS Translator
) and post the result here.
It recognized my voice well enough (except "The Preamble" - it shows "That Preamble). Computers do much better than smartphones. The latter, like iPhone, e.g., is good at most common talks like "Are you going to Trenton, New Jersey to meet David Copperfield to discuss magic with him?"
You have to pronounce in Standard English. Many native English speakers have a regional accent. I wonder how well the Microsoft Bing Translator would have recognized them.