A test on the reliability and performance of the verbex series 4000 voice recognizer

Voice recognition systems are becoming increasingly widespread as forms of data entry. One such use of speech input would be as an aid to pilot communication in the cockpit. The Verbex Series 4000 Voice Recognizer (VVR) was chosen as the input channel for a forthcoming flight simulation system. The VVR is a speaker dependent unit with the ability to recognize continuous speech. An additional feature of the VVR is its use of structured grammars in defining the speech format. Tests were run to determine the VVR's reliability, and also to investigate the variations in performance for different grammar structures.