Binaural-cue Weighting in Sound Localization with Open-fit Hearing Aids and in Simulated Reverberation PDF Download
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Author: Anna C. Diedesch
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 118
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Book Description
Author: Anna C. Diedesch
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 118
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Book Description
Author: Jens Blauert
Publisher: Springer Science & Business Media
ISBN: 3642377629
Category : Technology & Engineering
Languages : en
Pages : 516
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Book Description
This book reports on the application of advanced models of the human binaural hearing system in modern technology, among others, in the following areas: binaural analysis of aural scenes, binaural de-reverberation, binaural quality assessment of audio channels, loudspeakers and performance spaces, binaural perceptual coding, binaural processing in hearing aids and cochlea implants, binaural systems in robots, binaural/tactile human-machine interfaces, speech-intelligibility prediction in rooms and/or multi-speaker scenarios. An introduction to binaural modeling and an outlook to the future are provided. Further, the book features a MATLAB toolbox to enable readers to construct their own dedicated binaural models on demand.
Author: Tran M. Nguyen
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Book Description
Sound localization in the horizontal plane depends on interaural time difference (ITD) and interaural level difference (ILD) cues, which are both available in wideband sounds. Previous studies have directly measured listener weighting of those cues only under quiet, anechoic conditions, but not in the presence of noise and reverberation, which can degrade both ITD and ILD. This study examined the effects of changes in target spectral profile, background noise, and reverberation on sound localization performance and cue weighting strategies. Listeners reported locations of targets that were presented over headphones in virtual auditory space. ITD and ILD were manipulated by attenuating or delaying the sound at one ear, and their weighting was computed by comparing the listener's localization response bias to the imposed cue bias. Results suggest that ITD dominates for any wideband target in quiet conditions, but that listeners increase their weighting of ILD in more adverse listening conditions.
Author: Ruth Y. Litovsky
Publisher: Springer Nature
ISBN: 3030571009
Category : Medical
Languages : en
Pages : 425
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Book Description
The field of Binaural Hearing involves studies of auditory perception, physiology, and modeling, including normal and abnormal aspects of the system. Binaural processes involved in both sound localization and speech unmasking have gained a broader interest and have received growing attention in the published literature. The field has undergone some significant changes. There is now a much richer understanding of the many aspects that comprising binaural processing, its role in development, and in success and limitations of hearing-aid and cochlear-implant users. The goal of this volume is to provide an up-to-date reference on the developments and novel ideas in the field of binaural hearing. The primary readership for the volume is expected to be academic specialists in the diverse fields that connect with psychoacoustics, neuroscience, engineering, psychology, audiology, and cochlear implants. This volume will serve as an important resource by way of introduction to the field, in particular for graduate students, postdoctoral scholars, the faculty who train them and clinicians.
Author: Andrew D. Brown
Publisher:
ISBN:
Category : Acoustic localization
Languages : en
Pages : 111
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Book Description
Normal-hearing human listeners localize sound sources accurately and effortlessly across an effectively limitless variety of acoustic environments by responding to, among other cues, small differences in the timing and intensity of sound arriving at the two ears (interaural time differences [ITD] and interaural level differences [ILD]). This dissertation explores the temporal dynamics of normal sensitivity to these cues by assessing normal-hearing listeners' weighting of ITD or ILD cues over the duration of binaurally dynamic stimuli in a variety of psychophysical experiments. Experimental stimuli were rapidly amplitude-modulated signals mimicking those typical of echoic environments (e.g., rooms), including rapid sequences of filtered impulses carrying varied ITD or ILD over their duration, and pairs and trains of pairs of clicks carrying discrete ITD or ILD in first and second click of each pair. Consistent with past studies of the precedence effect in sound localization, onset dominance in lateralization and binaural adaptation, data demonstrated a prime salience of ILD and especially ITD at signal onset. Somewhat more surprisingly, data also indicated greater sensitivity to post-onset ILD than post-onset ITD (i.e., a weaker precedence effect for ILD). These psychophysical data were qualitatively consistent with outputs of a simple model that included peripheral auditory filtering effects, auditory nerve adaptation, and parallel computation of ITD and ILD. These investigations collectively suggest that accurate sound localization in ordinary listening environments depends on acute ITD and ILD sensitivity at signal onset, followed (on scale of a few to tens of milliseconds) by post-onset attenuation of ITD sensitivity and dependence on ILD for detection of changes in the environment (e.g., introduction of a novel source).
Author: John F. Woodruff
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Book Description
We also consider how the computational goal of CASA-based segregation should be defined in reverberant environments. The ideal binary mask (IBM) has been established as a main goal of CASA. While the IBM is defined unambiguously in anechoic conditions, in reverberant environments there is some flexibility in how one might define the target signal itself and therefore, ambiguity is introduced to the notion of the IBM. Due to the perceptual distinction between early and late reflections, we introduce the reflection boundary as a parameter to the IBM definition to allow target reflections to be divided into desirable and undesirable components. We conduct a series of intelligibility tests with normal hearing listeners to compare alternative IBM definitions. Results show that it is vital for the IBM definition to account for the energetic effect of early target reflections, and that late target reflections should be characterized as noise.
Author: Kassandra-Anne Birtch
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Cochlear implant (CI) users' limited ability to use acoustical cues for sound localization causes left/right confusions and front/back reversals. Head movement is beneficial in reducing these errors in acoustically hearing listeners. This study investigated the effect of head movement on localization throughout 360o of azimuth for both real and simulated CI users. Listeners in a bilateral electro-acoustic (CI with ipsilateral hearing aid) simulation derived the greatest head movement benefit in reducing front/back reversals. Left/right confusions were reduced in simulations with matched bilateral stimulation. Sensitivity to both timing and level cues for sound localization was correlated with sound localization performance without head movement for simulated device users. Sensitivity to timing cues was correlated with sound localization performance with head movement cues for simulated device users. Simulations of bilateral CI and bimodal users (CI with contralateral hearing aid) listening predicted real users' sound localization performance, binaural sensitivity and head movement patterns.
Author: Lisa Anne Roberts
Publisher:
ISBN:
Category :
Languages : en
Pages : 158
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Book Description
Author: Pawel Strumillo
Publisher: IntechOpen
ISBN: 9789533072241
Category : Technology & Engineering
Languages : en
Pages : 606
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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: Simon Carlile
Publisher: Springer Science & Business Media
ISBN: 3662225948
Category : Medical
Languages : en
Pages : 258
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Book Description
An illusion of auditory space can be generated by the appropriate filtering of sounds presented over headphones: the so-called virtual auditory space (VAS). This book provides a bridge between many of the different disciplines that are involved in developing and exploiting this technology. The first part is fairly introductory in nature, while the second examines a number of issues relating to the generation of high fidelity virtual auditory space. The last two chapters review current research applications of VAS.
