Handling OOV words in Arabic ASR via flexible morphological constraints
Nguyễn Bách, Mohamed Noamany, Ian Richard Lane, Tanja Schultz · 2007
We propose a novel framework to detect and recognize outof-vocabulary (OOV) words in automated speech recognition (ASR).In the proposed framework a hybrid language model combining words and sub-word units is incorporated during ASR decoding then three different OOV words recognition methods are applied to generate OOV word hypotheses.Specifically, dictionary lookup, morphological composition, and direct phoneme-to-grapheme.The proposed approach successfully reduced WER by 1.9% and 1.6% for ASR systems with recognition vocabularies of 30K and 219K.Moreover, the proposed approach correctly recognized 5% of OOV words.