More sophisticated dialog managers incorporate mechanisms for dealing with misunderstandings and clarification. Such directed dialog systems use a tree-like structure for control frame- (or form-) based systems allow for some user initiative and accommodate different styles of interaction. A simple dialog system may ask the user questions then act on the response. The dialog manager controls turn-by-turn behavior.Some approaches will combine recognition and understanding processing but are thought to be less flexible since interpretation has to be coded into the grammar. Natural language understanding transforms a recognition into a concept structure that can drive system behavior.A "cloud" recognizer will be suitable for domains that do not depend on very specific vocabularies. Domain-specific recognizers can be configured for language designed for a given application. An automatic Speech recognizer (ASR) decodes speech into text.
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