Interspeech'2005 - Eurospeech

Lisbon, Portugal
September 4-8, 2005

Improved Discriminative Training Using Phone Lattices

Jing Zheng, Andreas Stolcke

SRI International, USA

We present an efficient discriminative training procedure utilizing phone lattices. Different approaches to expediting lattice generation, statistics collection, and convergence were studied. We also propose a new discriminative training criterion, namely, minimum phone frame error (MPFE). When combined with the maximum mutual information (MMI) criterion using I-smoothing, replacing the standard minimum phone error (MPE) criterion with MPFE led to a small but consistent win in several applications. Phone-latticebased discriminative training gave around 8% to 12% relative word error rate (WER) reduction in SRI's latest English Conversational Telephone Speech and Broadcast News transcription systems developed for DARPA's EARS project.

Full Paper

Bibliographic reference.  Zheng, Jing / Stolcke, Andreas (2005): "Improved discriminative training using phone lattices", In INTERSPEECH-2005, 2125-2128.