Systems and methods for determining a confidence score associated with a decoding output of a speech recognition engine. In one embodiment, a method of determining the confidence score comprises arranging time frame and acoustic score data into an array, determining a phoneme sequence in the array that yields the highest sum of acoustic scores under certain constraints, e.g., minimum number of time frames and order of phonemes in a phoneme string. A relative score is derived by applying a functional relationship between the acoustic score and different sums comprising acoustic scores from the array. The confidence score, in some embodiments, depends at least in part on the relative score and a measure of ambiguity associated with similar sounding phrases being included in different concepts of a specified grammar.
RELATED APPLICATIONS
This application claims the benefit under 35 U.S.C. .sctn. 119(e) of U.S. Provisional Application No. 60/451,227, filed Feb. 28, 2003 and titled "SPEECH RECOGNITION CONCEPT CONFIDENCE MEASUREMENT," which is hereby incorporated by reference. This application is related to U.S. patent application Ser. No. 10/317,837, filed Dec. 10, 2002 and titled "SPEECH RECOGNITION SYSTEM HAVING AN APPLICATION PROGRAM INTERFACE," which is hereby incorporated by reference.
