Author: SRI International
-
Innovation In Urban School Settings: Integrating Contexts And Tools In Support Of Learning
-
Nonlinear Discriminant Feature Extraction for Robust Text-Independent Speaker Recognition
We study a nonlinear discriminant analysis (NLDA) technique that extracts a speaker-discriminant feature set. Our approach is to train a multilayer perceptron (MLP) to maximize the separation between speakers by nonlinearly projecting a large set of acoustic features (e.g., several frames) to a lower-dimensional feature set.
-
Plywood Walls And Exposed Pipes: Supporting A Culture Of Learning In An On-Line Teacher Professional Development Community
-
Dialog Act Modeling for Conversational Speech
We describe an integrated approach for statistical modeling of discourse structure for natural conversational speech. Our model is based on 42 `dialog acts’, which were hand-labeled in 1155 conversations from the Switchboard corpus of spontaneous human-to-human telephone speech.
-
Entropy-based Pruning of Backoff Language Models
A criterion for pruning parameters from N-gram backoff language models is developed, based on the relative entropy between the original and the pruned model. It is shown that the relative entropy resulting from pruning a single N-gram can be computed exactly and efficiently for backoff models.
-
New Developments in Lattice-Based Search Strategies in SRI’s Hub4 System
We describe new developments in SRI’s lattice-based progressive search strategy. These developments include the implementation of a new bigram lattice algorithm, lattice optimization techniques, and expansion of bigram lattices to trigram lattices.
-
Speech Technology and Language Learning: Some Examples from VILTS, the Voice Interactive Language Training System
In this paper we describe the development of the Voice Interactive Language Training System (VILTS) and our experience in exploring the potential of speech technology in service to language learning.
-
The Development of SRI’s 1997 Broadcast News Transcription System
This paper describes SRI’s 1997 broadcast news transcription system used for the 1997 DARPA H4 evaluations. Our system had several novel components. We briefly describe these features and give comparative experimental results.
-
Connecting With The Twenty-First Century: Technology In Support Of Educational Reform
We present an alternative image of what schools might be like and a set of interlocking social, pedagogical and technological changes that could transform the educational enterprise.
-
Hybrid Planning: An Approach to Integrating Generative and Case-Based Planning
This paper describes ongoing research on the development of a hybrid planning system that integrates case-based reasoning (CBR) methods into SIPE-2, a generative planning system.
-
The Mathematics Of Change And Variation From A Millennial Perspective: New Content, New Context
We shall examine large-scale trends in content changes and in context changes for learning and using mathematics. From this set of factors, we raise three questions.
-
Can Prosody Aid the Automatic Classification of Dialog Acts in Conversational Speech?
This study asks whether current approaches, which use mainly word information, could be improved by adding prosodic information. The study is based on more than 1000 conversations from the Switchboard corpus.