A voice–user interface (VUI) makes human interaction with computers possible through a voice/speech platform in order to initiate an automated service or process. A VUI is the interface to any speech application. Controlling a machine by simply talking to it was science fiction only a short time ago. Until recently, this area was considered to be artificial intelligence. However, with advances in technology, VUIs have become more commonplace, and people are taking advantage of the value that these hands-free, eyes-free interfaces provide in many situations. The system will be implemented by using techniques such as speech and language processing, human language technology, natural language processing, computational linguistics, and speech recognition and synthesis. The goal of this new field is to get computers to perform useful tasks involving human language, tasks like enabling human-machine communication, improving human-human communication, or simply doing useful processing of text or speech. These voice applications can provide intrinsically comfortable, easy-to-use, and efficient way for users to interact with computer. And as user can use commands in his mother tongue so it is asking your friend computer to do something for you. As a technology for expression, voice works for a much wider range of people than typing, drawing, or gesture because it is a natural part of human existence. Without a great deal of training, normal human beings can express themselves in a wide variety of domains using voice applications, and thus this breadth of application will be a powerful tool in a ubiquitous environment.

Voice Recognition Speech Synthesis Digitization Acoustic Model Speech Engine.