A syntax aided isolated word recognition system for a subset of FORTRAN

This paper describes an isolated word recognition system for a subset of FORTRAN in which the syntax of a formal language is used to aid a simple acoustic level word recognizer. The acoustic level recognizer makes use of the fast Fourier transform to estimate a short-time spectrum which is coded with a set of 24 binary values. Words to be recognized are compared with patterns stored in a reference vocabulary. The syntax of the language allows the number of comparisons that must be made to be reduced significantly, and also aids in directing the recognition procedure. Test results indicate that inclusion of syntactic constraints increases the per cent of correct recognition by approximately 25%.