Jason Davenport

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In this paper, we describe the BBN BYBLOS system used for the 1999 Hub-4E 10xRT evaluation benchmark, and discuss the improvements made to the system in 1999. We focus on the techniques that were new in this year's system to achieve an optimal tradeoff between accuracy and speed for the evaluation benchmark test. Overall , we improved the recognition(More)
Five groups of female rats which were exposed to thiouracil for varying periods around the time of birth were compared with a 6th group of untreated controls in motivational, metabolic, and hormonal test situations during adolescence and adulthood. The thiouracil-treated rats displayed reduced fearfulness in lever-touching and lever-pressing tasks in(More)
In this paper, we describe the BBN Byblos system used for the 1997 DARPA Hub-4 Broadcast News evaluation and discuss numerous improvements made to the system in 1997. We focused our eeort entirely upon the two conditions containing studio-quality uncorrupted speech from native speakers, the so-called F0 (prepared speech) and F1 (spontaneous speech)(More)
Behavioral deficits in adult rats exposed perinatally to thiouracil were substantially reduced or elimated by a 5-week period of "superenriched" postweaning rearing conditions before testing. This treatment resulted in remediation of hypothyroid rats' deficits in maze learning, maze retention, and resistance to extinction of bar-pressing; the facilitative(More)
In this paper, we describe the BBN BYBLOS system used for the 1998 Hub-4E primary and Hub-4Sp evaluation benchmarks, and discuss the improvements made to the system in 1998. We focus on the techniques that were new in this year's system, including processing of the acoustic training data, test segmentation, revised cep-stral normalization and Vocal Tract(More)
In this paper, we describe our recent signiicant progress in automatic transcription of broadcast news programming from radio and television, compared to that described in 1 at EuroSpeech97. Overall, we achieve a 42 relative w ord error rate reduction during the latest DARPA N o v ember 1998 Hub-4 Evaluation, in contrast to the 1996 evaluation result(More)
In this paper we describe the BBN Byblos 10x real time system used for the 1998 Hub-4 English tests. Given our state of the art primary system [1] running at 230 times real time (230 xRT) we show that eliminating and approximating many computationally expensive components speeds up the system by a factor of 23 with a relative loss in WER of 18%. This is(More)