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The SLS group addresses a broad range of research topics, but they can generally be grouped according to three basic questions: 1) who is talking, 2) what is said, and 3) what is meant. The first area focuses on paralinguistic issues like speaker verification, language and dialect identification, and speaker diarization (i.e., who spoke when). However, we are also beginning to examine health-related issues as they are manifested in the speech signal. The second research area addresses core speech recognition capabilities and addresses challenges related to noise robustness, limited linguistic resources, and unsupervised language acquisition. The third and final area focuses more on the boundary between speech and natural language processing, and includes topics related to speech understanding, but also related areas such as sentiment analysis and dialogue.