SAPI SDK is a voice application development toolkit provided by Microsoft for free, the SDK contains the voice
application design interface (SAPI), Microsoft's continuous speech recognition engine (MCSR) and Microsoft's
speech synthesis (TTS) engine, and so on. The current version 5.1 can support a total of three kinds of language
recognition (English, Chinese and Japanese) and synthetic two kinds of languages (English and Chinese). SAPI
also includes low-level control for powerful and highly adaptable direct voice management, training guide,
events, grammar compi