Voice Recognition in Unity3D for Cross Platform Project?

My game needs voice recognition for player's conversational sentences that the output is text for further processing and NPC responses. The project is planned to be a browser based that run across various platforms (PC, Mac, iPad, Android Pad, etc.).

Is there a way to build in a voice recognition engine in Unity3D to solve my issue?

Google voice recognition is a web based, but I didn't find any resource on how to build it into Unity3D.

Does the Microsoft voice recognition only support PC or surface?

I also would like to record player's sound while doing voice recognition. Is it possible?

I sincerely hope someone could help me! Thanks a million!!!