From switchboard to meetings: development of the 2004 ICSI-SRI-UW meeting recognition system
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We describe the ICSI-SRI-UW team's entry in the Spring 2004 NIST Meeting Recognition Evaluation. The system was de- rived from SRI's 5xRT Conversational Telephone Speech (CTS) recognizer by adapting CTS acoustic and language models to the Meeting domain, adding noise reduction and delay-sum array processing for far-field recognition, and postprocessing for cross-talk suppression. A modified MAP adaptation proce- dure was developed to make best use of discriminatively trained (MMIE) prior models. These meeting-specific changes yielded an overall 9% and 22% relative improvement as compared to the original CTS system, and 16% and 29% relative improve- ment as compared to our 2002 Meeting Evaluation system, for the individual-headset and multiple-distant microphones condi- tions, respectively.