Let me ‘splain. …
No there is too much – let me sum up.
I found an app on my phone that translates things on the fly and then repeats them back in the Destination Language.
I’m going to use it to communicate with a guy I see on my ride frequently.
So, while testing it out at home I decided I might be able to reproduce the sounds of the destination language and get English back out.
Hello, how are you doing?
你好，你怎么样？ (what I heard – Ni HahNee Tsa MaTsua?)
So I just said it back (what I heard).
Ni HahNee Tsa MaTsua?
Hello hello how do?
HEYYYY – success, at least in my book!
Then TheWeeOne tried.
Ni HahNee Tsa MaTsua?
Hello hello how you how do?
Mommy’s turn – walking in from the kitchen – correcting our bad pronunciation.
And with authority…
Ni Hah Nee Tsa MaTsua?
The thing cranked a little longer for TheMommy?
We waited with bated breath.
It sounded great to me.
In a very proper and beautiful voice it translated
Dog sex.
blief 
Aaannnddd….that is why I will not be the one talking if we ever go to an Asian country.
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I remember reading a science fiction story where the people carried a translator device that did pretty much what you described; producing an audio translation of a sentence. The hero found himself in trouble when his translator suddenly quit working.
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