Abstract
The Lincoln system is designed to recognize sentences conforming to a context-free grammar. Parsing is guided by a heuristic evaluation function which combines individual word scores into parse path scores. The word scores measure the degree of correspondence between phonemic dictionary spellings and the results of an acoustic-phonetic analysis of the input sentence. Word scoring is based on two computer-generated scoring matrices derived from confusion statistics gathered from 113 sentences. The synchronization problem resulting from missing and spurious segments is simplified by first aligning the vowels (sometimes in more than one combination). The effect of phonological rules is handled by insetting optional phonemes in the dictionary and flagging others as possibly missing. Other rules, which are specific to Lincoln's front-end analysis, predict spurious segments and the effect of neighboring semivowels on vowel classification. [This work was sponsored by the Advanced Research Projects Agency of the Department of Defense.]
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