Title :
Cross-Site and Intra-Site ASR System Combination: Comparisons on Lattice and 1-Best Methods
Author :
Hoffmeister, B. ; Hillard, D. ; Hahn, Seungyong ; Schluter, Ralf ; Ostendorf, Mari ; Ney, Hermann
Author_Institution :
Dept. of Comput. Sci., RWTH Aachen Univ., Germany
Abstract :
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.
Keywords :
speech recognition; 1-best ROVER; 1-best method; TC-STAR 2006 evaluation; automatic speech recognition; cross-site-intra-site ASR system combination; lattice method; pairwise combinations; Automatic speech recognition; Computer science; Cost function; Decoding; Lattices; Speech recognition; Testing; Uncertainty; Virtual manufacturing; Voting; speech recognition; system combination;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2007. ICASSP 2007. IEEE International Conference on
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0727-3
DOI :
10.1109/ICASSP.2007.367277
