A recognizer trained with full-bandwidth speech performs badly when recognizing band-limited speech because of environment mismatch. In this paper, we have proposed a novel model synthesis method for band-limited speech recognition. It detects speech bandwidth automatically and synthesizes a new acoustic model only using a full-bandwidth model when the bandwidth has been changed. Experiments conducted on TIMIT/NTIMIT databases show that the proposed method has achieved substantial improvement over the baseline speech recognizer.
Bibliographic reference. He, Yongjun / Han, Jiqing (2010): "Model synthesis for band-limited speech recognition", In INTERSPEECH-2010, 558-561.