4th International Conference on Spoken Language Processing

Philadelphia, PA, USA
October 3-6, 1996

Speech Recognition Using Sub-word Units Dependent On Phonetic Contexts Of Both Training and Recognition Vocabularies

Hiroaki Hattori, Eiko Yamada

Information Technology Research Laboratories, NEC Corporation, Kanagawa, Japan

This paper proposes a new speech recognition algorithm using a new context-dependent recognition unit design method for efficient and precise acoustic modeling. This algorithm uses both training and recognition vocabularies to select context-dependent units which precisely represent acoustic variations due to phonetic contexts in a recognition vocabulary. An efficient training algorithm for selected context-dependent units is also proposed. In speaker-independent isolated-word recognition experiments, the proposed algorithm gave a 11% error reduction for 5000 word recognition, and gave a 43% error reduction for 10 digit recognition. These results confirmed the effectiveness of the proposed method.

Full Paper

Bibliographic reference.  Hattori, Hiroaki / Yamada, Eiko (1996): "Speech recognition using sub-word units dependent on phonetic contexts of both training and recognition vocabularies", In ICSLP-1996, 2309-2312.