Publications
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MLLR Transforms as Features in Speaker Recognition
We explore the use of adaptation transforms employed in speech recognition systems as features for speaker recognition. This approach is attractive because, unlike standard frame-based cepstral speaker recognition models, it…
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Robust Feature Compensation in Nonstationary and Multiple Noise Environments
We extend the POF algorithm to allow a more accurate way to select noisy-to-clean feature mappings, by allowing different combinations of speech and noise to have combination-specific mappings selected depending…
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Two Experiments Comparing Reading with Listening for Human Processing of Conversational Telephone Speech
We report on results of two experiments designed to compare subjects’ ability to extract information from audio recordings of conversational telephone speech (CTS) with their ability to extract information from…
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A Personalized Time Management Assistant: Research Directions
This paper presents ongoing work to build the Personalized Time Manager (PTIME) system, a persistent assistant that builds on our previous work on a personalized calendar agent (PCalM) (Berry et…
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A Robust Method for Tracking Scene Text in Video Imagery
We describe an approach that tracks planar regions of scene text that can undergo arbitrary 3-D rigid motion and scale changes. Our approach computes homographies on blocks of contiguous frames…
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Collaborative and argumentative models of natural discussions
We report in this paper experiences and insights resulting from the first two years of work in two similar projects on meeting tracking and understanding. The projects are the DARPA-funded…
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Identifying and Segmenting Human-Motion for Mobile Robot Navigation using alignment errors
This paper presents a new human-motion identification and segmentation algorithm from moving cameras. The algorithm is based on alignment error between pairs of moving object images. Pairs of object images…
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Masquerade Detection via Customized Grammars
We use the Sequitur algorithm to generate a context-free grammar which efficiently extracts repetitive sequences of commands executed by one user – which is mainly used to generate a profile of the…
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Evidence-Centered Assessment Design: Layers, Structures, and Terminology (Padi Technical Report 9)
This presentation provides an overview of ECD, highlighting the ideas of layers in the process, structures and representations within layers, and terms and concepts that can be used to guide…
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Task Templates Based on Misconception Research (Padi Technical Report 6)
This paper reports one such effort, motivated by assessments that elicit students’ qualitative explanations of situations that have been designed to provoke misconceptions and partial understandings. We describe four task-specific…
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Using Conditional Random Fields for Sentence Boundary Detection in Speech
In this paper, we evaluate the use of a conditional random field (CRF) for this task and relate results with this model to our prior work. We evaluate across two…
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A Portable Process Language
In this paper, we report on a process language, PPL, that we have designed to serve as a bridge between a representation designed for execution and a representation designed for…