| Diode-Pumped Nd:YAG/Cr(4+):YAG MicroChip-Laser System at 214.8 nm for the Detection of NO |
30 JUL 1999 |
24 pages |
| Authors:
J. Wormhoudt; J. H. Shorter; J. J. Zayhowski; C. Cook; AERODYNE RESEARCH INC BILLERICA MA
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 | A passively Q-switched 214.8-nm Nd:YAG/Cr(4+):YAG microchip-laser system for the detection of NO was designed, constructed, and tested. The system uses the fifth harmonic of the 1.074-micrometers transition in Nd:YAG to detect NO at the few-parts-per-billion level. A significant challenge was the development of an environmentally stable coating to provide the necessary discrimination between the 1.074-micrometers laser line and the stronger transition at 1.064 micrometers. The ... |
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| A Feasibility Study of Very Low Rate Speech Compression Systems. |
FEB 1977 |
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| Authors:
J. Makhoul; R. Schwartz; C. Cook; D. Klatt; BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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 | This report documents the results of a feasibility study for very low rate speech compression systems. Two systems were implemented: (1) A variable rate, hybrid formant-LPC vocoder transmitting at an average of 500 bps, and (2) a phonetic vocoder transmitting at an average rate of 75 bps. The intelligibility of the 500 bps system was judged to be high, but with a loss in naturalness and speaker identifiability. The 75 ... |
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| Speech Understanding Systems. Volume IV. Syntax and Semantics. |
DEC 1976 |
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| Authors:
William A. Woods; M. Bates; G. Brown; B. Bruce; C. Cook; BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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| Contents: Parsers; Grammars; and Prosodics. |
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| Speech Understanding Systems. Volume V. Trip. |
DEC 1976 |
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| Authors:
William A. Woods; M. Bates; G. Brown; B. Bruce; C. Cook; BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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| Contents: Natural Communication with a Computer; Types of Knowledge Needed; Representations and Processing; Travel Budget Management; Flow of Control; Parsing; Semantic Interpretation; SEMNET - The Network Utility Package; Command Language; Data Base Structure; Discourse Model; Text Response Generation; and Speech Synthesis. |
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| Speech Understanding Systems. |
AUG 1976 |
24 pages |
| Authors:
William A. Woods; L. Bates; G. Brown; B. Bruce; C. Cook; BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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| This report describes recent progress of the BBN Speech Understanding Systems project covering the period from May 1976 to July 1976. The BBN Speech Understanding project is an effort to develop a continuous speech understanding system which uses syntactic, semantic and pragmatic support from higher level linguistic knowledge sources to compensate for the inherent acoustic indeterminacies in continuous spoken utterances. These knowledge sources are integrated with sophisticated signal processing and ... |
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| Speech Understanding Systems. |
MAY 1976 |
158 pages |
| Authors:
W. Woods; M. Bates; G. Brown; B. Vruce; C. Cook; BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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| This report describes recent progress of the BBN Speech Understanding Systems project covering the period from February 1976 to April 1976. The BBN Speech Understanding project is an effort to develop a continuous speech understanding system which uses syntactic, semantic and pragmatic support from higher level linguistic knowledge sources to compensate for the inherent acoustic interminacies in continuous spoken utterances. These knowledge sources are integrated with sophisticated signal processing and ... |
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| Speech Understanding Systems. |
FEB 1976 |
107 pages |
| Authors:
William A. Woods; M. Bates ; G. Brown; B. Bruce; C. Cook; BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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| This project is an effort to develop a continuous speech understanding system which uses syntactic, semantic and pragmatic support from higher level linguistic knowledge sources to compensate for the inherent acoustic indeterminacies in continuous spoken utterances. These knowledge sources are integrated with sophisticated signal processing and acoustic-phonetic analysis of the input signal, to produce a total system for understandiing continuous speech. The system contains components for signal analysis, acoustic parameter ... |
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| Surface Preparation and Characterization Techniques for Quartz Resonators. |
AUG 1973 |
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| Authors:
J. Vig; H. Wasshausen; C. Cook; M. Katz; E. Hafner; ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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| CHNIQUES. The polishing processes which to date produced the most defect-free surfaces are described. The surface crystallinities were investigated by high energy electron diffraction (HEED). Clearly defined Kikuchi lines were observed indicating that if there is a disturbed surface layer, its thickness is less than 100A. The effectiveness of the hydrogen peroxide based cleaning procedure was investigated by Auger electron spectroscopy. A fraction of a monolayer of carbon was the ... |
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