Patent Document ID: 7890325
Application ID: 11376803

Base Claim:
1. A computer-readable storage medium including instructions readable by a computer which, when implemented comprise: receiving a speech-based signal; generating a decoder result comprising at least one sequence of linguistic units based on applying a context free grammar to the speech-based signal; decomposing the decoder result into a decomposed decoder result comprising at least one sequence of subword elements; accessing a background model having probabilities of subword elements in one or more natural language; generating competitive sequences using the decomposed decoder result and the background model; and calculating a confidence measure using the competitive sequences and the decomposed decoding result by calculating a model based posterior probability score using the decomposed decoding result and the competitive sequences.

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Claim 2:
2. The computer readable storage medium of claim 1 , wherein the subword elements are one of phonemes, syllables, senones, diphones, or triphones.