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Hits 81 – 92 of 92
81
Intelligent Assistant Systems: An Artificial Intelligence Approach to Detecting Performance Degradation and Pilot Incapacitation
Boy, Guy A.
In: DTIC AND NTIS (1990)
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82
Removal of Noise from Noise-Degraded Speech Signals. Panel on Removal of Noise from a Speech/Noise Signal
In: DTIC AND NTIS (1989)
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83
Performance Analysis of Large Adaptive Sidelobe Canceller Arrays with Reused Elements
Ward, J.
;
Compton, Jr, R. T.
In: DTIC AND NTIS (1989)
Abstract:
This report considers adaptive sidelobe canceller arrays (SLCs) in which the mainbeam and auxiliary signals are obtained from the same set of elements. The SLC with element reuse is different from the conventional SLC in that thermal noise components of the mainbeam and auxiliary signals are correlated. This correlation causes sidelobe degradation when the number of degrees of freedom exceeds the number necessary to cancel a given jammer scenario. The equations for a general planar array with an arbitrary signal scenario are first formulated. These equations are then used to examine array performance with different auxiliary configurations. Both auxiliaries form from a single array element and auxiliaries form from subarrays of elements are studied. Various auxiliary configurations are investigated to determine how the auxiliaries should be chosen to provide good cancellation of multiple jammers while retaining low sidelobes in the mainbeam. It is shown that using single- element auxiliaries may result in serious SLL degradation whenever there are extra degrees of freedom. This degradation can be overcome by using subarray auxiliaries that satisfy an orthogonality condition on their patterns. Excellent cancellation and sidelobe level performance can be attained with small subarrays chosen to satisfy this orthogonaltiy condition.
Keyword:
*ADAPTIVE SYSTEMS
;
*CANCELLATION
;
*JAMMING
;
*NOISE(ELECTRICAL AND ELECTROMAGNETIC)
;
*SIDELOBES
;
*SIGNALS
;
ARRAYS
;
AUXILIARY
;
CONFIGURATIONS
;
Countermeasures
;
Cybernetics
;
DEGRADATION
;
DEGREES OF FREEDOM
;
EQUATIONS
;
LOW LEVEL
;
NOISE
;
ORTHOGONALITY
;
PERFORMANCE TESTS
;
PERFORMANCE(ENGINEERING)
;
PLANAR STRUCTURES
;
Radiofrequency Wave Propagation
;
SCENARIOS
;
THERMAL RESISTANCE
URL:
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA212888
http://www.dtic.mil/docs/citations/ADA212888
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84
The Effects of Hearing Protectors on Speech Communication and the Perception of Warning Signals
Suter, Alice H.
In: DTIC AND NTIS (1989)
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85
Intelligibility of ICAO (International Civil Aviation Organization) Spelling Alphabet Words and Digits Using Severely Degraded Speech Communication Systems. Part 1. Narrowband Digital Speech.
Schmidt-Nielsen,Astrid
In: DTIC AND NTIS (1987)
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86
Voice Degradation in Using Speech Recognisers for Transcribing Inventory Data.
Kirby,H R
;
Roach,P J
In: DTIC AND NTIS (1987)
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87
Two Approaches to Predictive Indeterminacy
Stump, Gregory
In: Linguistics Faculty Publications (1984)
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88
Evidence for defective transfer ribonucleic acid in polymyopathic hamsters and its inhibitory effect on protein synthesis
Bester, André J.
;
Gevers, Wieland
. - 1973
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89
Multiplexing of Delta Modulated Signals. Volume 1.
Bennier, Donald J.
;
McKibbin, John
;
Wollaston, Terence C.
In: DTIC AND NTIS (1968)
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90
ADVANCED ECM SUSCEPTIBILITY MEASUREMENT OF VOICE COMMUNICATIONS EQUIPMENTS.
Mutschler, C.
;
Schultz, J.
;
Strohmeyer, G.
In: DTIC AND NTIS (1967)
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91
SYNTHETIC SPEECH STUDY.
BOGUSZ,J.
;
Smith,R.
;
Strohmeyer,G.
In: DTIC AND NTIS (1966)
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92
LETTER TO THE EDITOR Conventional 39 end formation is not required for NMD substrate recognition in Saccharomyces cerevisiae
Kristian E. Baker
;
Roy Parker
In: http://www.case.edu/med/coller/Baker and Parker 2006.pdf
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