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Author: Publisher: ISBN: Category : Languages : en Pages : 28
Book Description
Speech communication are seldom isolated auditory events in quiet environments. Frequently, the desired speech signal is confounded with other speech signals and noises. Real-world environments often degrade the intelligibility of the desired speech signal. In this book chapter (Binaural and Spatial Hearing in Real and Virtual Environments, Lawrence Erlbaum Associates, Mahwah NJ, publishers, 1997), the literature on the speech intelligibility of competing messages and the masking of speech is reviewed. The literature on the detection of speech is included to describe factors that can affect speech intelligibility. Following the review, several experiments are presented in which the effects of various conflicting signals on speech communications are measured. Virtual audio over headphones is used to investigate the effects of directional separation of talkers, the quantity and gender of talkers, the degree of masker interaural correlation, masking level, and selective attention. The results are discussed and compared with the previous literature.
Author: Publisher: ISBN: Category : Languages : en Pages : 28
Book Description
Speech communication are seldom isolated auditory events in quiet environments. Frequently, the desired speech signal is confounded with other speech signals and noises. Real-world environments often degrade the intelligibility of the desired speech signal. In this book chapter (Binaural and Spatial Hearing in Real and Virtual Environments, Lawrence Erlbaum Associates, Mahwah NJ, publishers, 1997), the literature on the speech intelligibility of competing messages and the masking of speech is reviewed. The literature on the detection of speech is included to describe factors that can affect speech intelligibility. Following the review, several experiments are presented in which the effects of various conflicting signals on speech communications are measured. Virtual audio over headphones is used to investigate the effects of directional separation of talkers, the quantity and gender of talkers, the degree of masker interaural correlation, masking level, and selective attention. The results are discussed and compared with the previous literature.
Author: Robert Gilkey Publisher: Psychology Press ISBN: 1317780256 Category : Language Arts & Disciplines Languages : en Pages : 1109
Book Description
The current popular and scientific interest in virtual environments has provided a new impetus for investigating binaural and spatial hearing. However, the many intriguing phenomena of spatial hearing have long made it an exciting area of scientific inquiry. Psychophysical and physiological investigations of spatial hearing seem to be converging on common explanations of underlying mechanisms. These understandings have in turn been incorporated into sophisticated yet mathematically tractable models of binaural interaction. Thus, binaural and spatial hearing is one of the few areas in which professionals are soon likely to find adequate physiological explanations of complex psychological phenomena that can be reasonably and usefully approximated by mathematical and physical models. This volume grew out of the Conference on Binaural and Spatial Hearing, a four-day event held at Wright-Patterson Air Force Base in response to rapid developments in binaural and spatial hearing research and technology. Meant to be more than just a proceedings, it presents chapters that are longer than typical proceedings papers and contain considerably more review material, including extensive bibliographies in many cases. Arranged into topical sections, the chapters represent major thrusts in the recent literature. The authors of the first chapter in each section have been encouraged to take a broad perspective and review the current state of literature. Subsequent chapters in each section tend to be somewhat more narrowly focused, and often emphasize the authors' own work. Thus, each section provides overview, background, and current research on a particular topic. This book is significant in that it reviews the important work during the past 10 to 15 years, and provides greater breadth and depth than most of the previous works.
Author: Pawel Strumillo Publisher: BoD – Books on Demand ISBN: 9533072245 Category : Technology & Engineering Languages : en Pages : 608
Book Description
Sound source localization is an important research field that has attracted researchers' efforts from many technical and biomedical sciences. Sound source localization (SSL) is defined as the determination of the direction from a receiver, but also includes the distance from it. Because of the wave nature of sound propagation, phenomena such as refraction, diffraction, diffusion, reflection, reverberation and interference occur. The wide spectrum of sound frequencies that range from infrasounds through acoustic sounds to ultrasounds, also introduces difficulties, as different spectrum components have different penetration properties through the medium. Consequently, SSL is a complex computation problem and development of robust sound localization techniques calls for different approaches, including multisensor schemes, null-steering beamforming and time-difference arrival techniques. The book offers a rich source of valuable material on advances on SSL techniques and their applications that should appeal to researches representing diverse engineering and scientific disciplines.
Author: National Research Council Publisher: National Academies Press ISBN: 0309175119 Category : Technology & Engineering Languages : en Pages : 240
Book Description
This book examines the human factors issues associated with the development, testing, and implementation of helmet-mounted display technology in the 21st Century Land Warrior System. Because the framework of analysis is soldier performance with the system in the full range of environments and missions, the book discusses both the military context and the characteristics of the infantry soldiers who will use the system. The major issues covered include the positive and negative effects of such a display on the local and global situation awareness of the individual soldier, an analysis of the visual and psychomotor factors associated with each design feature, design considerations for auditory displays, and physical sources of stress and the implications of the display for affecting the soldier's workload. The book proposes an innovative approach to research and testing based on a three-stage strategy that begins in the laboratory, moves to controlled field studies, and culminates in operational testing.
Author: Renita Elizabeth Sudirga Publisher: ISBN: Category : Languages : en Pages : 314
Book Description
Previous studies provide evidence that listening experience in a particular reverberant environment improves speech intelligibility and localization performance in that environment. Such studies, however, are few, and there is little knowledge of the underlying mechanisms. The experiments presented in this thesis explored the effect of reverberation context, in particular, the similarity in interaural coherence within a context, on listeners' performance in sound localization, speech perception in a spatially separated noise, spatial release from speech-on-speech masking, and target location identification in a multi-talker configuration. All experiments were conducted in simulated reverberant environments created with a loudspeaker array in an anechoic chamber. The reflections comprising the reverberation in each environment had the same temporal and relative amplitude patterns, but varied in their lateral spread, which affected the interaural coherence of reverberated stimuli. The effect of reverberation context was examined by comparing performance in two reverberation contexts, mixed and fixed. In the mixed context, the reverberation environment applied to each stimulus varied trial-by-trial, whereas in the fixed context, the reverberation environment was held constant within a block of trials. In Experiment I (absolute judgement of sound location), variability in azimuth judgments was lower in the fixed than in the mixed context, suggesting that sound localization depended not only on the cues presented in isolated trials. In Experiment II, the intelligibility of speech in a spatially separated noise was found to be similar in both reverberation contexts. That result contrasts with other studies, and suggests that the fixed context did not assist listeners in compensating for degraded interaural coherence. In Experiment III, speech intelligibility in multi-talker configurations was found to be better in the fixed context, but only when the talkers were separated. That is, the fixed context improved spatial release from masking. However, in the presence of speech maskers, consistent reverberation did not improve the localizability of the target talker in a three-alternative location-identification task. Those results suggest that in multi-talker situations, consistent coherence may not improve target localizability, but rather that consistent context may facilitate the buildup of spatial selective attention.
Author: John Martin Publisher: CRC Press ISBN: 1317152077 Category : Technology & Engineering Languages : en Pages : 505
Book Description
This book focuses on contemporary human factors issues within the design of soldier systems and describes how they are currently being investigated and addressed by the U.S. Army to enhance soldier performance and effectiveness. Designing Soldier Systems approaches human factors issues from three main perspectives. In the first section, Chapters 1-5 focus on complexity introduced by technology, its impact on human performance, and how issues are being addressed to reduce cognitive workload. In the second section, Chapters 6-10 concentrate on obstacles imposed by operational and environmental conditions on the battlefield and how they are being mitigated through the use of technology. The third section, Chapters 11-21, is dedicated to system design and evaluation including the tools, techniques and technologies used by researchers who design soldier systems to overcome human physical and cognitive performance limitations as well as the obstacles imposed by environmental and operations conditions that are encountered by soldiers. The book will appeal to an international multidisciplinary audience interested in the design and development of systems for military use, including defense contractors, program management offices, human factors engineers, human system integrators, system engineers, and computer scientists. Relevant programs of study include those in human factors, cognitive science, neuroscience, neuroergonomics, psychology, training and education, and engineering.
Author: Lawrence J. Hettinger Publisher: CRC Press ISBN: 1410608883 Category : Technology & Engineering Languages : en Pages : 597
Book Description
With contributions from a collection of authors consisting of many recognizable experts in the field of virtual and adaptive environments, as well as many up and coming young researchers, this book illustrates the many ways in which psychological science contributes to and benefits from the increased development and application of these nascent systems. Discussing issues from both a user- and technology-based standpoint, the volume examins the use of human perception, cognition, and behavior. The book builds a foundation on the assumption that these systems are first and foremost human-centered technologies, in that their purpose is to complement and extend human capabilities across a wide variety of domains.
Author: Yoiti Suzuki Publisher: World Scientific ISBN: 9814465410 Category : Psychology Languages : en Pages : 518
Book Description
Humans possess a remarkable ability to extract rich three-dimensional information about sound environments simply by analyzing the acoustic signals they receive at their two ears. Research in spatial hearing has evolved from a theoretical discipline studying the basic mechanisms of hearing to a technical discipline focused on designing and implementing increasingly sophisticated spatial auditory display systems. This book contains 39 chapters representing the current state-of-the-art in spatial audio research selected from papers presented in Sendai, Japan, at the First International Workshop on the Principles and Applications of Spatial Hearing.
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Author: Robert Gilkey
Author: Pawel Strumillo
Author: Acoustical Society of America
Author: National Research Council
Author: Renita Elizabeth Sudirga
Author: John Martin
Author: Lawrence J. Hettinger
Author: Yoiti Suzuki
Author: Achim Klug