1. Notes on ICASSP 2004 Arthur Chan May 24, 2004

2. This Presentation (5 pages)  Brief note of ICASSP 2004  NIST RT 04 Evaluation results  Other interesting things relate to CALO

3. NIST RT 04 Meeting Transcription – Headlines.  Meeting Transcription A challenge to core technology, evaluation and resource preparation.  Core technology Speaker Segmentation Speech to Text (STT)  Evaluation New evaluation scheme is deviced for overlapped speech.  Resource preparation LDC has a big headache in preparing the data.

4. Speaker Segmentation  Segmenting the speech Search for the number of speakers. Get speaker turns. Measured by Diarization rate.  Insights: (from ISL) More speakers: the harder the task. A new measure called speaker speaking time entropy is proposed.

5. STT  Very hard task ICSI, ISL use the state of the art technology  +Constrained linear transform  +Discriminative training (DT-MAP)  +Speaker Adaptive Training. Individual headphone results WER: 34.8% for non-overlapping speech. Some meeting is very hard. Many people is speaking at the same time.  Trained on 4 different subset of data, ICSI data is just one of them (70% of the total)  Insights: (ICSI) feature-based technique doesn ’ t help too much Multiple-distance microphones and array microphones techniques help.  Conclusion: we will also have a hard-time.

6. Evaluation and Resource Preparation  Evaluation: Overlapped speech require different schemes for evaluation Will require multiple string matching. (Detail unknown yet.)  Resource Preparation Currently, no tool can satisfy the need of transcribing multiple channels of speech with interaction Professional transcriber failed.

7. Other interesting news from ICASSP related to CALO  Project EARS: Lightly supervised training  3000 hours close captioned speech is used  Discriminative training is found to be useful for some sites.  Others