ABSTRACT
The use of speech recognition and voice control has been researched for more than 20 years, and many of the proposed benefits have been demonstrated in varied applications. Continuing advances in computer hardware and software are making the use of voice control applications on the flightdeck more practical, flexible, and reliable. Current speech recognition and voice control systems are not able to achieve this level of performance expectations, although the ability and flexibility of speech recognition and its application to voice control has increased over the past few years. Speech recognition is based on statistical pattern matching. One of the more common methods of speech recognition based on pattern matching uses Hidden Markov modeling comprising two types of pattern models, the acoustical model and the language model. Speaker-independent recognition systems are independent of the user. This type of system is intended to allow multiple users to access a system using voice input.
