In the presence of pronunciation variation and the masking effects of additive noise, we investigate the role of phonetic information reduction and lexical confusability on ASR performance. Contrary to previous work , we show that place of articulation as a representation for unstressed segments performs at least as well as manner of articulation in the presence of additive noise. Methods of phonetic reduction introduce lexical confusibility which negatively impact performance. By limiting this confusability, recognizers that employ high levels of phonetic reduction (40.1%) can perform as well a baseline system in the presence of nonstationary noise.
Bibliographic reference. Hartmann, William / Fosler-Lussier, Eric (2009): "Investigating phonetic information reduction and lexical confusability", In INTERSPEECH-2009, 1659-1662.