A good service for recognizing English letters through a microphone?

Question

Unity

Hello,
now we are puzzled by the search for a service or a ready-made library under unity for recognizing individual letters of the English alphabet. Google speech does not recognize individual letters well. And if some can be replaced (for example, C is She), then he does not recognize the letter R at all ...
Who has any ideas?

Answer 1

Try azure cognitive service