Martin Hansen

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Inhabitants in smart environments are often authenticated when they enter the smart environment, e.g., through biometrics or smart-/swipe-card systems. It may sometimes be necessary to re-authenticate when an inhabitant wishes to enter a restricted area or access ambient services or location based information, e.g., it is common to have swipe card terminals(More)
This paper describes the application of a quantitative psychoacoustical signal preprocessing model for objective speech quality measurement. The preprocessing is applied to transform the original and the distorted speech signal to an internal representation which is thought of as the information that is accessible to higher neural stages of perception. From(More)
OBJECTIVE The purpose of this study was to determine the influence of the compression time constants in a multi-channel compression hearing aid on both subjectively assessed speech intelligibility and sound quality in realistic binaural acoustical situations for normal-hearing and hearing-impaired listeners. DESIGN A nonlinear hearing aid with 15(More)
The present w ork concerns a system aimed at enhancing a target talker under varying signal conditions based on the use of several dierent t ypes of information or \cues". Toward this end, an architecture designed to combine separately operating estimators is described and evaluated. The architecture is currently implemented using spatial-and(More)
UNLABELLED PET brain imaging of the serotonin 2A (5-hydroxytryptamine 2A, or 5-HT(2A)) receptor has been widely used in clinical studies, and currently, several well-validated radiolabeled antagonist tracers are used for in vivo imaging of the cerebral 5-HT(2A) receptor. Access to 5-HT(2A) receptor agonist PET tracers would, however, enable imaging of the(More)
When re-synthesizing individual head related transfer functions (HRTFs) with a microphone array, smoothing HRTFs spectrally and/or spatially prior to the computation of appropriate microphone filters may improve the synthesis accuracy. In this study, the limits of the associated HRTF modifications, until which no perceptual degradations occur, are explored.(More)
We investigate the phenomenological viability of a recently proposed class of composite dark matter models where the relic density is determined by 3 → 2 number-changing processes in the dark sector. Here the pions of the strongly interacting field theory constitute the dark matter particles. By performing a consistent next-to-leading and(More)
2,5-Dimethoxyphenethylamines and their N-benzylated derivatives are potent 5-HT2A agonists with psychedelic effects in humans. The N-benzylated derivatives are among the most selective 5-HT2A agonists currently available and their usage as biochemical and brain imaging tools is increasing, yet very little is known about the relationships between the(More)
[(11)C]Cimbi-36 was recently developed as a selective serotonin 2A (5-HT(2A)) receptor agonist radioligand for positron emission tomography (PET) brain imaging. Such an agonist PET radioligand may provide a novel, and more functional, measure of the serotonergic system and agonist binding is more likely than antagonist binding to reflect 5-HT levels in(More)
2-([2-(4-cyano-2,5-dimethoxyphenyl)ethylamino]methyl)phenol (25CN-NBOH) is structurally similar to N-benzyl substituted phenethylamine hallucinogens currently emerging as drugs of abuse. 25CN-NBOH exhibits dramatic selectivity for 5-HT2A receptors in vitro, but has not been behaviorally characterized. 25CN-NBOH was compared to the traditional phenethylamine(More)