We present the AMIDA 2009 system for participation in the NIST RT'2009 STT evaluations. Systems for close-talking, far field and speaker attributed STT conditions are described. Improvements to our previous systems are: segmentation and diarisation; stacked bottle-neck posterior feature extraction; fMPE training of acoustic models; adaptation on complete meetings; improvements to WFST decoding; automatic optimisation of decoders and system graphs. Overall these changes gave a 6-13% relative reduction in word error rate while at the same time reducing the real-time factor by a factor of five and using considerably less data for acoustic model training.
Bibliographic reference. Hain, Thomas / Burget, Lukáš / Dines, John / Garner, Philip N. / Hannani, Asmaa El / Huijbregts, Marijn / Karafiát, Martin / Lincoln, Mike / Wan, Vincent (2010): "The AMIDA 2009 meeting transcription system", In INTERSPEECH-2010, 358-361.