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https://www.readbyqxmd.com/read/27406662/spatial-acoustic-scenarios-in-multichannel-loudspeaker-systems-for-hearing-aid-evaluation
#1
Giso Grimm, Birger Kollmeier, Volker Hohmann
BACKGROUND: Field tests and guided walks in real environments show that the benefit from hearing aid (HA) signal processing in real-life situations is typically lower than the predicted benefit found in laboratory studies. This suggests that laboratory test outcome measures are poor predictors of real-life HA benefits. However, a systematic evaluation of algorithms in the field is difficult due to the lack of reproducibility and control of the test conditions. Virtual acoustic environments that simulate real-life situations may allow for a systematic and reproducible evaluation of HAs under more realistic conditions, thus providing a better estimate of real-life benefit than established laboratory tests...
July 2016: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/27406661/evaluation-of-loudspeaker-based-virtual-sound-environments-for-testing-directional-hearing-aids
#2
Chris Oreinos, Jörg M Buchholz
BACKGROUND: Assessments of hearing aid (HA) benefits in the laboratory often do not accurately reflect real-life experience. This may be improved by employing loudspeaker-based virtual sound environments (VSEs) that provide more realistic acoustic scenarios. It is unclear how far the limited accuracy of these VSEs influences measures of subjective performance. PURPOSE: Verify two common methods for creating VSEs that are to be used for assessing HA outcomes. RESEARCH DESIGN: A cocktail-party scene was created inside a meeting room and then reproduced with a 41-channel loudspeaker array inside an anechoic chamber...
July 2016: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/27355775/a-model-of-auditory-cognitive-processing-and-relevance-to-clinical-applicability
#3
Brent Edwards
Hearing loss and cognitive function interact in both a bottom-up and top-down relationship. Listening effort is tied to these interactions, and models have been developed to explain their relationship. The Ease of Language Understanding model in particular has gained considerable attention in its explanation of the effect of signal distortion on speech understanding. Signal distortion can also affect auditory scene analysis ability, however, resulting in a distorted auditory scene that can affect cognitive function, listening effort, and the allocation of cognitive resources...
July 2016: Ear and Hearing
https://www.readbyqxmd.com/read/26928003/effects-of-modified-hearing-aid-fittings-on-loudness-and-tone-quality-for-different-acoustic-scenes
#4
Brian C J Moore, Thomas Baer, D Timothy Ives, Josephine Marriage, Marina Salorio-Corbetto
OBJECTIVE: To compare loudness and tone-quality ratings for sounds processed via a simulated five-channel compression hearing aid fitted using NAL-NL2 or using a modification of the fitting designed to be appropriate for the type of listening situation: speech in quiet, speech in noise, music, and noise alone. DESIGN: Ratings of loudness and tone quality were obtained for stimuli presented via a loudspeaker in front of the participant. For normal-hearing participants, levels of 50, 65, and 80 dB SPL were used...
July 2016: Ear and Hearing
https://www.readbyqxmd.com/read/26736855/influence-of-the-occlusion-effect-over-the-prediction-error-feedback-cancellation-system-in-hearing-aids
#5
Renata Coelho Borges, Marcio Holsbach Costa
This work presents a theoretical analysis of the prediction-error method-based adaptive feedback canceller in hearing aid applications. The studied scene takes into account the occlusion effect caused by the partial or complete closing of the ventilation opening. Such a situation may occur in high gain applications to avoid undesired whistling. Deterministic recursive equations and steady-state conditions were derived for the mean weight behaviour of the predictor and the adaptive filter. The expected theoretical predictions were compared to Monte Carlo simulations, showing very accurate agreement...
August 2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/26203150/neural-mechanisms-for-acoustic-signal-detection-under-strong-masking-in-an-insect
#6
Konstantinos Kostarakos, Heiner Römer
Communication is fundamental for our understanding of behavior. In the acoustic modality, natural scenes for communication in humans and animals are often very noisy, decreasing the chances for signal detection and discrimination. We investigated the mechanisms enabling selective hearing under natural noisy conditions for auditory receptors and interneurons of an insect. In the studied katydid Mecopoda elongata species-specific calling songs (chirps) are strongly masked by signals of another species, both communicating in sympatry...
July 22, 2015: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/26093433/objective-analysis-of-ambisonics-for-hearing-aid-applications-effect-of-listener-s-head-room-reverberation-and-directional-microphones
#7
Chris Oreinos, Jörg M Buchholz
Recently, an increased interest has been demonstrated in evaluating hearing aids (HAs) inside controlled, but at the same time, realistic sound environments. A promising candidate that employs loudspeakers for realizing such sound environments is the listener-centered method of higher-order ambisonics (HOA). Although the accuracy of HOA has been widely studied, it remains unclear to what extent the results can be generalized when (1) a listener wearing HAs that may feature multi-microphone directional algorithms is considered inside the reconstructed sound field and (2) reverberant scenes are recorded and reconstructed...
June 2015: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/25324082/assessment-of-auditory-spatial-awareness-in-complex-listening-environments
#8
Douglas S Brungart, Julie Cohen, Mary Cord, Danielle Zion, Sridhar Kalluri
In the real world, listeners often need to track multiple simultaneous sources in order to maintain awareness of the relevant sounds in their environments. Thus, there is reason to believe that simple single source sound localization tasks may not accurately capture the impact that a listening device such as a hearing aid might have on a listener's level of auditory awareness. In this experiment, 10 normal hearing listeners and 20 hearing impaired listeners were tested in a task that required them to identify and localize sound sources in three different listening tasks of increasing complexity: a single-source localization task, where listeners identified and localized a single sound source presented in isolation; an added source task, where listeners identified and localized a source that was added to an existing auditory scene, and a remove source task, where listeners identified and localized a source that was removed from an existing auditory scene...
October 2014: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/25313548/the-relationship-between-the-acceptance-of-noise-and-acoustic-environments-in-young-adults-with-normal-hearing-a-pilot-study
#9
Clifford A Franklin, Letitia J White, Thomas C Franklin, Laura Smith-Olinde
BACKGROUND: The acceptable noise level (ANL) indicates how much background noise a listener is willing to accept while listening to speech. The clinical impact and application of the ANL measure is as a predictor of hearing-aid use. The ANL may also correlate with the percentage of time spent in different listening environments (i.e., quiet, noisy, noisy with speech present, etc). Information retrieved from data logging could confirm this relationship. Data logging, using sound scene analysis, is a method of monitoring the different characteristics of the listening environments that a hearing-aid user experiences during a period...
June 2014: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/24800410/representing-colour-through-hearing-and-touch-in-sensory-substitution-devices
#10
REVIEW
Giles Hamilton-Fletcher, Jamie Ward
Visual sensory substitution devices (SSDs) allow visually-deprived individuals to navigate and recognise the 'visual world'; SSDs also provide opportunities for psychologists to study modality-independent theories of perception. At present most research has focused on encoding greyscale vision. However at the low spatial resolutions received by SSD users, colour information enhances object-ground segmentation, and provides more stable cues for scene and object recognition. Many attempts have been made to encode colour information in tactile or auditory modalities, but many of these studies exist in isolation...
2013: Multisensory Research
https://www.readbyqxmd.com/read/24578684/how-age-and-linguistic-competence-alter-the-interplay-of-perceptual-and-cognitive-factors-when-listening-to-conversations-in-a-noisy-environment
#11
Meital Avivi-Reich, Meredyth Daneman, Bruce A Schneider
Multi-talker conversations challenge the perceptual and cognitive capabilities of older adults and those listening in their second language (L2). In older adults these difficulties could reflect declines in the auditory, cognitive, or linguistic processes supporting speech comprehension. The tendency of L2 listeners to invoke some of the semantic and syntactic processes from their first language (L1) may interfere with speech comprehension in L2. These challenges might also force them to reorganize the ways in which they perceive and process speech, thereby altering the balance between the contributions of bottom-up vs...
2014: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/24364709/perceptual-asymmetry-induced-by-the-auditory-continuity-illusion
#12
Dorea R Ruggles, Andrew J Oxenham
The challenges of daily communication require listeners to integrate both independent and complementary auditory information to form holistic auditory scenes. As part of this process listeners are thought to fill in missing information to create continuous perceptual streams, even when parts of messages are masked or obscured. One example of this filling-in process-the auditory continuity illusion-has been studied primarily using stimuli presented in isolation, leaving it unclear whether the illusion occurs in more complex situations with higher perceptual and attentional demands...
June 2014: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/23605976/cochlear-implants-in-the-forensic-identification-process
#13
John Berketa, Helen James, Neil Langlois, Lindsay Richards
PURPOSE: Decedents who are severely decomposed, skeletonized or incinerated present challenges for identification. Cochlear implants aid hearing and bear unique serial numbers that can be used to assist with identification of bodies that are not visually identifiable. The purpose of this paper was to highlight companies that have or had manufactured cochlear type implants and demonstrate the appearance of the implants to assist crime scene investigators, pathologists, anthropologists and odontologists...
September 2013: Forensic Science, Medicine, and Pathology
https://www.readbyqxmd.com/read/22712946/localization-of-virtual-sound-sources-with-bilateral-hearing-aids-in-realistic-acoustical-scenes
#14
Martin F Mueller, Andrea Kegel, Steven M Schimmel, Norbert Dillier, Markus Hofbauer
Sound localization with hearing aids has traditionally been investigated in artificial laboratory settings. These settings are not representative of environments in which hearing aids are used. With individual Head-Related Transfer Functions (HRTFs) and room simulations, realistic environments can be reproduced and the performance of hearing aid algorithms can be evaluated. In this study, four different environments with background noise have been implemented in which listeners had to localize different sound sources...
June 2012: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/21476677/improvement-of-intelligibility-of-ideal-binary-masked-noisy-speech-by-adding-background-noise
#15
Shuyang Cao, Liang Li, Xihong Wu
When a target-speech/masker mixture is processed with the signal-separation technique, ideal binary mask (IBM), intelligibility of target speech is remarkably improved in both normal-hearing listeners and hearing-impaired listeners. Intelligibility of speech can also be improved by filling in speech gaps with un-modulated broadband noise. This study investigated whether intelligibility of target speech in the IBM-treated target-speech/masker mixture can be further improved by adding a broadband-noise background...
April 2011: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/21241647/is-there-a-hearing-aid-for-the-thinking-person
#16
Ervin R Hafter
BACKGROUND: The history of auditory prosthesis has generally concentrated on bottom-up processing, that is, on audibility. However, a growing interest in top-down processing has focused on correlations between success with a hearing aid and such higher order processing as the patient's intelligence, problem solving and language skills, and the perceived effort of day-to-day listening. PURPOSE: Examination of two cases of cognitive effects in hearing that illustrate less-often-studied issues: (1) Individual subjects in a study use different listening strategies, a fact that, if not known to the experimenter, can lead to errors in interpretation; (2) A measure of shared attention can point to otherwise unknown functional effects of an algorithm used in hearing aids...
October 2010: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/20977025/graphical-representations-of-a-television-series-a-study-with-deaf-and-hearing-adolescents
#17
Cristina Cambra, Aurora Leal, Núria Silvestre
The understanding of a television story can be very different depending on the age of the viewer, their background knowledge, the content of the programme and the way in which they combine the information gathered from linguistic, audio and visual elements. This study explores the different ways of interpreting an audiovisual document considering that, due to a hearing impaired, visual, audio and linguistic information could be perceived very differently to the way it is by hearing people. The study involved the participation of 20 deaf and 20 hearing adolescents, aged 12 to 19 years who, after watching a fragment of a television series, were asked to draw a picture of what had happened in the story...
November 2010: Spanish Journal of Psychology
https://www.readbyqxmd.com/read/19418710/evaluation-of-a-direct-comparison-approach-to-automatic-switching-in-omnidirectional-directional-hearing-aids
#18
COMPARATIVE STUDY
Van Summers, Ken W Grant, Brian E Walden, Mary T Cord, Rauna K Surr, Mounya Elhilali
BACKGROUND: Hearing aids today often provide both directional (DIR) and omnidirectional (OMNI) processing options with the currently active mode selected automatically by the device. The most common approach to automatic switching involves "acoustic scene analysis" where estimates of various acoustic properties of the listening environment (e.g., signal-to-noise ratio [SNR], overall sound level) are used as a basis for switching decisions. PURPOSE: The current study was carried out to evaluate an alternative, "direct-comparison" approach to automatic switching that does not involve assumptions about how the listening environment may relate to microphone preferences...
October 2008: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/19371174/eye-and-heart-at-mortal-war-coronaries-and-controversy-in-a-smoke-free-scotland
#19
Martin Dockrell
Evaluation of: Pell JP, Haw S, Cobbe S et al. Smoke-free legislation and hospitalizations for acute coronary syndrome. N. Engl. J. Med. 359, 482-491 (2008). A study is published in one of the world's most reputable medical journals and is rated a "must read" by the prestigious Faculty of 1000 [101] , yet described in the BBC News Magazine--even before it is published--as looking like "over-hasty, over confident research" [102] and ranked among "the worst junk stats" of the year by a Pro Vice Chancellor of Oxford University...
February 2009: Expert Review of Pharmacoeconomics & Outcomes Research
https://www.readbyqxmd.com/read/19358456/using-trainable-hearing-aids-to-examine-real-world-preferred-gain
#20
RANDOMIZED CONTROLLED TRIAL
H Gustav Mueller, Benjamin W Y Hornsby, Jennifer E Weber
BACKGROUND: While there have been many studies of real-world preferred hearing aid gain, few data are available from participants using hearing aids with today's special features activated. Moreover, only limited data have been collected regarding preferred gain for individuals using trainable hearing aids. PURPOSE: To determine whether real-world preferred hearing aid gain with trainable modern hearing aids is in agreement with previous work in this area, and to determine whether the starting programmed gain setting influences preferred gain outcome...
November 2008: Journal of the American Academy of Audiology
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