Paper: Phrase-Based Query Degradation Modeling for Vocabulary-Independent Ranked Utterance Retrieval

ACL ID N09-1021
Title Phrase-Based Query Degradation Modeling for Vocabulary-Independent Ranked Utterance Retrieval
Venue Human Language Technologies
Session Main Conference
Year 2009
Authors

This paper introduces a new approach to rank- ing speech utterances by a system’s confi- dence that they contain a spoken word. Multi- ple alternate pronunciations, or degradations, of a query word’s phoneme sequence are hy- pothesized and incorporated into the ranking function. We consider two methods for hy- pothesizing these degradations, the best of which is constructed using factored phrase- basedstatisticalmachinetranslation. Weshow that this approach is able to significantly im- prove upon a state-of-the-art baseline tech- nique in an evaluation on held-out speech. We evaluate our systems using three differ- ent methods for indexing the speech utter- ances (using phoneme, phoneme multigram, and word recognition), and find that degrada- tionmodelingshowsparticularpromiseforlo- ca...