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Cross-Site and Intra-Site ASR System Combination: Comparisons on Lattice and 1-Best Methods

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6 Author(s)
B. Hoffmeister ; Informatik 6, Computer Science Dept., RWTH Aachen University, Aachen, Germany. hoffmeister@cs.rwth-aachen.de ; D. Hillard ; S. Hahn ; Ralf Schluter
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We evaluate system combination techniques for automatic speech recognition using systems from multiple sites who participated in the TC-STAR 2006 evaluation. Both lattice and 1-best combination techniques are tested for cross-site and intra-site tasks. For pairwise combinations the lattice based approaches can outperform 1-best ROVER with confidence scores, but 1-best ROVER results are equal (or even better) when combining three or four systems.

Published in:

2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07  (Volume:4 )

Date of Conference:

15-20 April 2007